SERVER-58344 Remove ServerGlobalParams::FeatureCompatibility and replace references with generated FCV constants

67 files changed, 348 insertions, 497 deletions

diff --git a/buildscripts/idl/idl/cpp_types.py b/buildscripts/idl/idl/cpp_types.py
index 8971d5715c8..d8e37dfcc56 100644
--- a/buildscripts/idl/idl/cpp_types.py
+++ b/buildscripts/idl/idl/cpp_types.py
@@ -48,11 +48,11 @@ def is_primitive_scalar_type(cpp_type):
     Primitive scalar types need to have a default value to prevent warnings from Coverity.
     """
     cpp_type = cpp_type.replace(' ', '')
-    # TODO (SERVER-50101): Remove 'FeatureCompatibility::Version' once IDL supports a commmand
-    # cpp_type of C++ enum.
+    # TODO (SERVER-50101): Remove 'multiversion::FeatureCompatibilityVersion' once IDL supports
+    # a commmand cpp_type of C++ enum.
     return cpp_type in [
-        'bool', 'double', 'ServerGlobalParams::FeatureCompatibility::Version', 'std::int32_t',
-        'std::uint32_t', 'std::uint64_t', 'std::int64_t'
+        'bool', 'double', 'std::int32_t', 'std::uint32_t', 'std::uint64_t', 'std::int64_t',
+        'multiversion::FeatureCompatibilityVersion'
     ]
 
 
diff --git a/src/mongo/db/catalog/coll_mod.cpp b/src/mongo/db/catalog/coll_mod.cpp
index 2e0f8bb4fad..605c4af8f7c 100644
--- a/src/mongo/db/catalog/coll_mod.cpp
+++ b/src/mongo/db/catalog/coll_mod.cpp
@@ -264,13 +264,13 @@ StatusWith<CollModRequest> parseCollModRequest(OperationContext* opCtx,
             // If the feature compatibility version is not kLatest, and we are validating features
             // as primary, ban the use of new agg features introduced in kLatest to prevent them
             // from being persisted in the catalog.
-            boost::optional<ServerGlobalParams::FeatureCompatibility::Version>
+            boost::optional<multiversion::FeatureCompatibilityVersion>
                 maxFeatureCompatibilityVersion;
             // (Generic FCV reference): This FCV check should exist across LTS binary versions.
-            ServerGlobalParams::FeatureCompatibility::Version fcv;
+            multiversion::FeatureCompatibilityVersion fcv;
             if (serverGlobalParams.validateFeaturesAsPrimary.load() &&
                 serverGlobalParams.featureCompatibility.isLessThan(
-                    ServerGlobalParams::FeatureCompatibility::kLatest, &fcv)) {
+                    multiversion::GenericFCV::kLatest, &fcv)) {
                 maxFeatureCompatibilityVersion = fcv;
             }
             cmr.collValidator = coll->parseValidator(opCtx,
diff --git a/src/mongo/db/catalog/collection.h b/src/mongo/db/catalog/collection.h
index 46f44a022d5..511fa9d1e3c 100644
--- a/src/mongo/db/catalog/collection.h
+++ b/src/mongo/db/catalog/collection.h
@@ -485,12 +485,11 @@ public:
     /**
      * Returns a non-ok Status if validator is not legal for this collection.
      */
-    virtual Validator parseValidator(
-        OperationContext* opCtx,
-        const BSONObj& validator,
-        MatchExpressionParser::AllowedFeatureSet allowedFeatures,
-        boost::optional<ServerGlobalParams::FeatureCompatibility::Version>
-            maxFeatureCompatibilityVersion) const = 0;
+    virtual Validator parseValidator(OperationContext* opCtx,
+                                     const BSONObj& validator,
+                                     MatchExpressionParser::AllowedFeatureSet allowedFeatures,
+                                     boost::optional<multiversion::FeatureCompatibilityVersion>
+                                         maxFeatureCompatibilityVersion) const = 0;
 
     /**
      * Sets the validator for this collection.
diff --git a/src/mongo/db/catalog/collection_impl.cpp b/src/mongo/db/catalog/collection_impl.cpp
index ba8addcc4bb..86253b55ba5 100644
--- a/src/mongo/db/catalog/collection_impl.cpp
+++ b/src/mongo/db/catalog/collection_impl.cpp
@@ -566,8 +566,8 @@ Collection::Validator CollectionImpl::parseValidator(
     OperationContext* opCtx,
     const BSONObj& validator,
     MatchExpressionParser::AllowedFeatureSet allowedFeatures,
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version>
-        maxFeatureCompatibilityVersion) const {
+    boost::optional<multiversion::FeatureCompatibilityVersion> maxFeatureCompatibilityVersion)
+    const {
     if (MONGO_unlikely(allowSettingMalformedCollectionValidators.shouldFail())) {
         return {validator, nullptr, nullptr};
     }
@@ -894,7 +894,7 @@ void CollectionImpl::_cappedDeleteAsNeeded(OperationContext* opCtx,
     }
 
     bool useOldCappedDeleteBehaviour = serverGlobalParams.featureCompatibility.isLessThan(
-        ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50);
+        multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
 
     if (!useOldCappedDeleteBehaviour && !opCtx->isEnforcingConstraints()) {
         // With new capped delete behavior, secondaries only delete from capped collections via
diff --git a/src/mongo/db/catalog/collection_impl.h b/src/mongo/db/catalog/collection_impl.h
index da391eea8f0..0e926262417 100644
--- a/src/mongo/db/catalog/collection_impl.h
+++ b/src/mongo/db/catalog/collection_impl.h
@@ -280,7 +280,7 @@ public:
     Validator parseValidator(OperationContext* opCtx,
                              const BSONObj& validator,
                              MatchExpressionParser::AllowedFeatureSet allowedFeatures,
-                             boost::optional<ServerGlobalParams::FeatureCompatibility::Version>
+                             boost::optional<multiversion::FeatureCompatibilityVersion>
                                  maxFeatureCompatibilityVersion = boost::none) const final;
 
     /**
diff --git a/src/mongo/db/catalog/collection_mock.h b/src/mongo/db/catalog/collection_mock.h
index 0d609ff7c91..7cb2b2b302a 100644
--- a/src/mongo/db/catalog/collection_mock.h
+++ b/src/mongo/db/catalog/collection_mock.h
@@ -199,7 +199,7 @@ public:
     Validator parseValidator(OperationContext* opCtx,
                              const BSONObj& validator,
                              MatchExpressionParser::AllowedFeatureSet allowedFeatures,
-                             boost::optional<ServerGlobalParams::FeatureCompatibility::Version>
+                             boost::optional<multiversion::FeatureCompatibilityVersion>
                                  maxFeatureCompatibilityVersion) const {
         std::abort();
     }
diff --git a/src/mongo/db/catalog/database_impl.cpp b/src/mongo/db/catalog/database_impl.cpp
index b8eef449892..965bc459cd2 100644
--- a/src/mongo/db/catalog/database_impl.cpp
+++ b/src/mongo/db/catalog/database_impl.cpp
@@ -926,10 +926,10 @@ Status DatabaseImpl::userCreateNS(OperationContext* opCtx,
         // primary, ban the use of new agg features introduced in kLatest to prevent them from being
         // persisted in the catalog.
         // (Generic FCV reference): This FCV check should exist across LTS binary versions.
-        ServerGlobalParams::FeatureCompatibility::Version fcv;
+        multiversion::FeatureCompatibilityVersion fcv;
         if (serverGlobalParams.validateFeaturesAsPrimary.load() &&
-            serverGlobalParams.featureCompatibility.isLessThan(
-                ServerGlobalParams::FeatureCompatibility::kLatest, &fcv)) {
+            serverGlobalParams.featureCompatibility.isLessThan(multiversion::GenericFCV::kLatest,
+                                                               &fcv)) {
             expCtx->maxFeatureCompatibilityVersion = fcv;
         }
 
diff --git a/src/mongo/db/commands/feature_compatibility_version.cpp b/src/mongo/db/commands/feature_compatibility_version.cpp
index 0e91e7630b9..fa295377bec 100644
--- a/src/mongo/db/commands/feature_compatibility_version.cpp
+++ b/src/mongo/db/commands/feature_compatibility_version.cpp
@@ -56,13 +56,13 @@
 #include "mongo/logv2/log.h"
 #include "mongo/rpc/get_status_from_command_result.h"
 #include "mongo/transport/service_entry_point.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 
 using repl::UnreplicatedWritesBlock;
-using FCVP = FeatureCompatibilityVersionParser;
-using FCVParams = ServerGlobalParams::FeatureCompatibility;
-using FCV = FCVParams::Version;
+using GenericFCV = multiversion::GenericFCV;
+using FCV = multiversion::FeatureCompatibilityVersion;
 
 using namespace fmt::literals;
 
@@ -91,17 +91,17 @@ public:
 
         // Steady states - they have FCV documents but no _transitions entries.
         for (auto fcv :
-             std::vector{FCVParams::kLastLTS, FCVParams::kLastContinuous, FCVParams::kLatest}) {
+             std::vector{GenericFCV::kLastLTS, GenericFCV::kLastContinuous, GenericFCV::kLatest}) {
             _fcvDocuments[fcv] = makeFCVDoc(fcv);
         }
 
         for (auto [from, upgrading, to] :
-             std::vector{std::make_tuple(FCVParams::kLastLTS,
-                                         FCVParams::kUpgradingFromLastLTSToLatest,
-                                         FCVParams::kLatest),
-                         std::make_tuple(FCVParams::kLastContinuous,
-                                         FCVParams::kUpgradingFromLastContinuousToLatest,
-                                         FCVParams::kLatest)}) {
+             std::vector{std::make_tuple(GenericFCV::kLastLTS,
+                                         GenericFCV::kUpgradingFromLastLTSToLatest,
+                                         GenericFCV::kLatest),
+                         std::make_tuple(GenericFCV::kLastContinuous,
+                                         GenericFCV::kUpgradingFromLastContinuousToLatest,
+                                         GenericFCV::kLatest)}) {
             for (auto isFromConfigServer : std::vector{false, true}) {
                 // Start or complete upgrading to latest. If this release's lastContinuous ==
                 // lastLTS then the second loop iteration just overwrites the first.
@@ -111,36 +111,36 @@ public:
             _fcvDocuments[upgrading] = makeFCVDoc(from /* effective */, to /* target */);
         }
 
-        if (FCVParams::kLastLTS != FCVParams::kLastContinuous) {
+        if (GenericFCV::kLastLTS != GenericFCV::kLastContinuous) {
             // Only config servers may request an upgrade from lastLTS to lastContinuous.
-            _transitions[{FCVParams::kLastLTS, FCVParams::kLastContinuous, true}] =
-                FCVParams::kUpgradingFromLastLTSToLastContinuous;
-            _transitions[{FCVParams::kUpgradingFromLastLTSToLastContinuous,
-                          FCVParams::kLastContinuous,
-                          true}] = FCVParams::kLastContinuous;
-            _fcvDocuments[FCVParams::kUpgradingFromLastLTSToLastContinuous] = makeFCVDoc(
-                FCVParams::kLastLTS /* effective */, FCVParams::kLastContinuous /* target */);
+            _transitions[{GenericFCV::kLastLTS, GenericFCV::kLastContinuous, true}] =
+                GenericFCV::kUpgradingFromLastLTSToLastContinuous;
+            _transitions[{GenericFCV::kUpgradingFromLastLTSToLastContinuous,
+                          GenericFCV::kLastContinuous,
+                          true}] = GenericFCV::kLastContinuous;
+            _fcvDocuments[GenericFCV::kUpgradingFromLastLTSToLastContinuous] = makeFCVDoc(
+                GenericFCV::kLastLTS /* effective */, GenericFCV::kLastContinuous /* target */);
         }
 
         for (auto [downgrading, to] :
-             std::vector{std::make_tuple(FCVParams::kDowngradingFromLatestToLastContinuous,
-                                         FCVParams::kLastContinuous),
-                         std::make_tuple(FCVParams::kDowngradingFromLatestToLastLTS,
-                                         FCVParams::kLastLTS)}) {
+             std::vector{std::make_tuple(GenericFCV::kDowngradingFromLatestToLastContinuous,
+                                         GenericFCV::kLastContinuous),
+                         std::make_tuple(GenericFCV::kDowngradingFromLatestToLastLTS,
+                                         GenericFCV::kLastLTS)}) {
             for (auto isFromConfigServer : std::vector{false, true}) {
                 // Start or complete downgrade from latest.  If this release's lastContinuous ==
                 // lastLTS then the second loop iteration just overwrites the first.
-                _transitions[{FCVParams::kLatest, to, isFromConfigServer}] = downgrading;
+                _transitions[{GenericFCV::kLatest, to, isFromConfigServer}] = downgrading;
                 _transitions[{downgrading, to, isFromConfigServer}] = to;
             }
             _fcvDocuments[downgrading] =
-                makeFCVDoc(to /* effective */, to /* target */, FCVParams::kLatest /* previous */
+                makeFCVDoc(to /* effective */, to /* target */, GenericFCV::kLatest /* previous */
                 );
         }
     }
 
     /**
-     * True if a server in ServerGlobalParams::FeatureCompatibility::Version "fromVersion" can
+     * True if a server in multiversion::FeatureCompatibilityVersion "fromVersion" can
      * transition to "newVersion". Different rules apply if the request is from a config server.
      */
     bool permitsTransition(FCV fromVersion, FCV newVersion, bool isFromConfigServer) const {
@@ -150,7 +150,7 @@ public:
 
     /**
      * Get a feature compatibility version enum value from a document representing the
-     * ServerGlobalParams::FeatureCompatibility::Version, or uassert if the document is invalid.
+     * multiversion::FeatureCompatibilityVersion, or uassert if the document is invalid.
      */
     FCV versionFromFCVDoc(const FeatureCompatibilityVersionDocument& fcvDoc) const {
         auto it = std::find_if(_fcvDocuments.begin(), _fcvDocuments.end(), [&](const auto& value) {
@@ -219,7 +219,7 @@ void runUpdateCommand(OperationContext* opCtx, const FeatureCompatibilityVersion
             BSONObjBuilder updateSpec(updates.subobjStart());
             {
                 BSONObjBuilder queryFilter(updateSpec.subobjStart("q"));
-                queryFilter.append("_id", FeatureCompatibilityVersionParser::kParameterName);
+                queryFilter.append("_id", multiversion::kParameterName);
             }
             {
                 BSONObjBuilder updateMods(updateSpec.subobjStart("u"));
@@ -249,7 +249,7 @@ boost::optional<BSONObj> FeatureCompatibilityVersion::findFeatureCompatibilityVe
     AutoGetCollection autoColl(opCtx, NamespaceString::kServerConfigurationNamespace, MODE_IX);
     invariant(autoColl.ensureDbExists(), NamespaceString::kServerConfigurationNamespace.ns());
 
-    const auto query = BSON("_id" << FeatureCompatibilityVersionParser::kParameterName);
+    const auto query = BSON("_id" << multiversion::kParameterName);
     const auto swFcv = repl::StorageInterface::get(opCtx)->findById(
         opCtx, NamespaceString::kServerConfigurationNamespace, query["_id"]);
     if (!swFcv.isOK()) {
@@ -267,7 +267,7 @@ void FeatureCompatibilityVersion::validateSetFeatureCompatibilityVersionRequest(
     uassert(
         5147403,
         "cannot set featureCompatibilityVersion to '{}' while featureCompatibilityVersion is '{}'"_format(
-            FCVP::toString(newVersion), FCVP::toString(fromVersion)),
+            multiversion::toString(newVersion), multiversion::toString(fromVersion)),
         fcvTransitions.permitsTransition(fromVersion, newVersion, isFromConfigServer));
 
     auto setFCVPhase = setFCVRequest.getPhase();
@@ -316,8 +316,8 @@ void FeatureCompatibilityVersion::validateSetFeatureCompatibilityVersionRequest(
 
 void FeatureCompatibilityVersion::updateFeatureCompatibilityVersionDocument(
     OperationContext* opCtx,
-    ServerGlobalParams::FeatureCompatibility::Version fromVersion,
-    ServerGlobalParams::FeatureCompatibility::Version newVersion,
+    FCV fromVersion,
+    FCV newVersion,
     bool isFromConfigServer,
     boost::optional<Timestamp> changeTimestamp,
     bool setTargetVersion) {
@@ -336,9 +336,7 @@ void FeatureCompatibilityVersion::updateFeatureCompatibilityVersionDocument(
 
     // The timestamp must be removed when downgrading to version 4.9 or 4.4. This is necessary to
     // avoid the presence of an unknown field that old binaries are unable to deserialize.
-    if (transitioningVersion == ServerGlobalParams::FeatureCompatibility::Version::kVersion49 ||
-        transitioningVersion ==
-            ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo44) {
+    if (transitioningVersion == FCV::kVersion_4_9 || transitioningVersion == FCV::kVersion_4_4) {
         fcvDoc.setChangeTimestamp(boost::none);
     } else {
         fcvDoc.setChangeTimestamp(changeTimestamp);
@@ -370,9 +368,9 @@ void FeatureCompatibilityVersion::setIfCleanStartup(OperationContext* opCtx,
 
     FeatureCompatibilityVersionDocument fcvDoc;
     if (storeUpgradeVersion) {
-        fcvDoc.setVersion(FCVParams::kLatest);
+        fcvDoc.setVersion(GenericFCV::kLatest);
     } else {
-        fcvDoc.setVersion(FCVParams::kLastLTS);
+        fcvDoc.setVersion(GenericFCV::kLastLTS);
     }
 
     // We then insert the featureCompatibilityVersion document into the server configuration
@@ -400,23 +398,23 @@ bool FeatureCompatibilityVersion::isCleanStartUp() {
 void FeatureCompatibilityVersion::updateMinWireVersion() {
     WireSpec& wireSpec = WireSpec::instance();
     const auto currentFcv = serverGlobalParams.featureCompatibility.getVersion();
-    if (currentFcv == FCVParams::kLatest ||
+    if (currentFcv == GenericFCV::kLatest ||
         (serverGlobalParams.featureCompatibility.isUpgradingOrDowngrading() &&
-         currentFcv != FCVParams::kUpgradingFromLastLTSToLastContinuous)) {
+         currentFcv != GenericFCV::kUpgradingFromLastLTSToLastContinuous)) {
         // FCV == kLatest or FCV is upgrading/downgrading to or from kLatest.
         WireSpec::Specification newSpec = *wireSpec.get();
         newSpec.incomingInternalClient.minWireVersion = LATEST_WIRE_VERSION;
         newSpec.outgoing.minWireVersion = LATEST_WIRE_VERSION;
         wireSpec.reset(std::move(newSpec));
-    } else if (currentFcv == FCVParams::kUpgradingFromLastLTSToLastContinuous ||
-               currentFcv == FCVParams::kLastContinuous) {
+    } else if (currentFcv == GenericFCV::kUpgradingFromLastLTSToLastContinuous ||
+               currentFcv == GenericFCV::kLastContinuous) {
         // FCV == kLastContinuous or upgrading to kLastContinuous.
         WireSpec::Specification newSpec = *wireSpec.get();
         newSpec.incomingInternalClient.minWireVersion = LAST_CONT_WIRE_VERSION;
         newSpec.outgoing.minWireVersion = LAST_CONT_WIRE_VERSION;
         wireSpec.reset(std::move(newSpec));
     } else {
-        invariant(currentFcv == FCVParams::kLastLTS);
+        invariant(currentFcv == GenericFCV::kLastLTS);
         WireSpec::Specification newSpec = *wireSpec.get();
         newSpec.incomingInternalClient.minWireVersion = LAST_LTS_WIRE_VERSION;
         newSpec.outgoing.minWireVersion = LAST_LTS_WIRE_VERSION;
@@ -461,8 +459,7 @@ void FeatureCompatibilityVersion::initializeForStartup(OperationContext* opCtx)
             {logv2::LogTag::kStartupWarnings},
             "A featureCompatibilityVersion upgrade/downgrade did not complete. To fix this, use "
             "the setFeatureCompatibilityVersion command to resume the upgrade/downgrade",
-            "currentfeatureCompatibilityVersion"_attr =
-                FeatureCompatibilityVersionParser::toString(version));
+            "currentfeatureCompatibilityVersion"_attr = multiversion::toString(version));
     }
 }
 
@@ -594,13 +591,11 @@ const ServerGlobalParams::FeatureCompatibility* FixedFCVRegion::operator->() con
     return &serverGlobalParams.featureCompatibility;
 }
 
-bool FixedFCVRegion::operator==(
-    const ServerGlobalParams::FeatureCompatibility::Version& other) const {
+bool FixedFCVRegion::operator==(const FCV& other) const {
     return serverGlobalParams.featureCompatibility.getVersion() == other;
 }
 
-bool FixedFCVRegion::operator!=(
-    const ServerGlobalParams::FeatureCompatibility::Version& other) const {
+bool FixedFCVRegion::operator!=(const FCV& other) const {
     return !(*this == other);
 }
 
diff --git a/src/mongo/db/commands/feature_compatibility_version.h b/src/mongo/db/commands/feature_compatibility_version.h
index 93c4065fde6..a0250b1f4f3 100644
--- a/src/mongo/db/commands/feature_compatibility_version.h
+++ b/src/mongo/db/commands/feature_compatibility_version.h
@@ -69,7 +69,7 @@ public:
     static void validateSetFeatureCompatibilityVersionRequest(
         OperationContext* opCtx,
         const SetFeatureCompatibilityVersion& setFCVRequest,
-        ServerGlobalParams::FeatureCompatibility::Version fromVersion);
+        multiversion::FeatureCompatibilityVersion fromVersion);
 
     /**
      * Updates the on-disk feature compatibility version document for the transition fromVersion ->
@@ -77,8 +77,8 @@ public:
      */
     static void updateFeatureCompatibilityVersionDocument(
         OperationContext* opCtx,
-        ServerGlobalParams::FeatureCompatibility::Version fromVersion,
-        ServerGlobalParams::FeatureCompatibility::Version newVersion,
+        multiversion::FeatureCompatibilityVersion fromVersion,
+        multiversion::FeatureCompatibilityVersion newVersion,
         bool isFromConfigServer,
         boost::optional<Timestamp> timestamp,
         bool setTargetVersion);
@@ -132,8 +132,8 @@ public:
     explicit FixedFCVRegion(OperationContext* opCtx);
     ~FixedFCVRegion();
 
-    bool operator==(const ServerGlobalParams::FeatureCompatibility::Version& other) const;
-    bool operator!=(const ServerGlobalParams::FeatureCompatibility::Version& other) const;
+    bool operator==(const multiversion::FeatureCompatibilityVersion& other) const;
+    bool operator!=(const multiversion::FeatureCompatibilityVersion& other) const;
 
     const ServerGlobalParams::FeatureCompatibility& operator*() const;
     const ServerGlobalParams::FeatureCompatibility* operator->() const;
diff --git a/src/mongo/db/commands/feature_compatibility_version_documentation.h b/src/mongo/db/commands/feature_compatibility_version_documentation.h
index 2926667d9ab..cfdfe8f1025 100644
--- a/src/mongo/db/commands/feature_compatibility_version_documentation.h
+++ b/src/mongo/db/commands/feature_compatibility_version_documentation.h
@@ -39,9 +39,9 @@ using namespace fmt::literals;
 
 const std::string kCompatibilityLink =
     "https://docs.mongodb.com/master/release-notes/{}-compatibility/#feature-compatibility"_format(
-        FeatureCompatibilityVersionParser::kLastLTS);
+        multiversion::toString(multiversion::GenericFCV::kLastLTS));
 const std::string kUpgradeLink =
     "https://docs.mongodb.com/master/release-notes/{}/#upgrade-procedures"_format(
-        FeatureCompatibilityVersionParser::kLastLTS);
+        multiversion::toString(multiversion::GenericFCV::kLastLTS));
 }  // namespace feature_compatibility_version_documentation
 }  // namespace mongo
diff --git a/src/mongo/db/commands/feature_compatibility_version_parser.cpp b/src/mongo/db/commands/feature_compatibility_version_parser.cpp
index 087755d9186..063d129ca95 100644
--- a/src/mongo/db/commands/feature_compatibility_version_parser.cpp
+++ b/src/mongo/db/commands/feature_compatibility_version_parser.cpp
@@ -36,123 +36,76 @@
 #include "mongo/db/commands/feature_compatibility_version_document_gen.h"
 #include "mongo/db/commands/feature_compatibility_version_documentation.h"
 #include "mongo/db/namespace_string.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 
-using FeatureCompatibilityParams = ServerGlobalParams::FeatureCompatibility;
+using GenericFCV = multiversion::GenericFCV;
 
-constexpr StringData FeatureCompatibilityVersionParser::kParameterName;
-
-constexpr StringData FeatureCompatibilityVersionParser::kLastLTS;
-constexpr StringData FeatureCompatibilityVersionParser::kLastContinuous;
-constexpr StringData FeatureCompatibilityVersionParser::kLatest;
-
-FeatureCompatibilityParams::Version FeatureCompatibilityVersionParser::parseVersion(
+multiversion::FeatureCompatibilityVersion FeatureCompatibilityVersionParser::parseVersion(
     StringData versionString) {
-    if (versionString == kLastLTS) {
-        return FeatureCompatibilityParams::kLastLTS;
-    }
-    if (versionString == kLastContinuous) {
-        return FeatureCompatibilityParams::kLastContinuous;
+    if (versionString == multiversion::toString(GenericFCV::kLastLTS)) {
+        return GenericFCV::kLastLTS;
     }
-    if (versionString == kLatest) {
-        return FeatureCompatibilityParams::kLatest;
+    if (versionString == multiversion::toString(GenericFCV::kLastContinuous)) {
+        return GenericFCV::kLastContinuous;
     }
-    uasserted(4926900,
-              str::stream() << "Invalid value for " << kParameterName << "document in "
-                            << NamespaceString::kServerConfigurationNamespace.toString()
-                            << ", found " << versionString << ", expected '" << kLastLTS << "' or '"
-                            << kLastContinuous << "' or '" << kLatest << ". See "
-                            << feature_compatibility_version_documentation::kCompatibilityLink
-                            << ".");
-}
-
-FeatureCompatibilityParams::Version FeatureCompatibilityVersionParser::parseVersionForFeatureFlags(
-    StringData versionString) {
-    if (versionString == kVersion51) {
-        return FeatureCompatibilityParams::Version::kVersion51;
-    }
-
-    if (versionString == kVersion50) {
-        return FeatureCompatibilityParams::Version::kFullyDowngradedTo50;
+    if (versionString == multiversion::toString(GenericFCV::kLatest)) {
+        return GenericFCV::kLatest;
     }
 
-    if (versionString == kVersion49) {
-        return FeatureCompatibilityParams::Version::kVersion49;
-    }
-
-    if (versionString == kVersion48) {
-        return FeatureCompatibilityParams::Version::kVersion48;
-    }
-
-    if (versionString == kVersion47) {
-        return FeatureCompatibilityParams::Version::kVersion47;
-    }
-
-    if (versionString == kVersion44) {
-        return FeatureCompatibilityParams::Version::kFullyDowngradedTo44;
-    }
+    uasserted(
+        4926900,
+        str::stream() << "Invalid value for " << multiversion::kParameterName << "document in "
+                      << NamespaceString::kServerConfigurationNamespace.toString() << ", found "
+                      << versionString << ", expected '"
+                      << multiversion::toString(GenericFCV::kLastLTS) << "' or '"
+                      << multiversion::toString(GenericFCV::kLastContinuous) << "' or '"
+                      << multiversion::toString(GenericFCV::kLatest) << ". See "
+                      << feature_compatibility_version_documentation::kCompatibilityLink << ".");
+}
 
-    uasserted(5715400,
-              str::stream() << "Invalid FCV version " << versionString << " for feature flag");
+multiversion::FeatureCompatibilityVersion
+FeatureCompatibilityVersionParser::parseVersionForFeatureFlags(StringData versionString) {
+    return multiversion::parseVersionForFeatureFlags(versionString);
 }
 
 StringData FeatureCompatibilityVersionParser::serializeVersion(
-    FeatureCompatibilityParams::Version version) {
-    if (version == FeatureCompatibilityParams::kLastLTS) {
-        return kLastLTS;
-    }
-    if (version == FeatureCompatibilityParams::kLastContinuous) {
-        return kLastContinuous;
-    }
-    if (version == FeatureCompatibilityParams::kLatest) {
-        return kLatest;
-    }
-    // It is a bug if we hit here.
-    invariant(false, "Invalid version value for featureCompatibilityVersion documents");
-    MONGO_UNREACHABLE
+    multiversion::FeatureCompatibilityVersion version) {
+    invariant(version == GenericFCV::kLastLTS || version == GenericFCV::kLastContinuous ||
+                  version == GenericFCV::kLatest,
+              "Invalid version value for featureCompatibilityVersion documents");
+
+    return multiversion::toString(version);
 }
 
 StringData FeatureCompatibilityVersionParser::serializeVersionForFeatureFlags(
-    FeatureCompatibilityParams::Version version) {
-    if (version == FeatureCompatibilityParams::Version::kVersion51) {
-        return kVersion51;
-    }
-
-    if (version == FeatureCompatibilityParams::Version::kFullyDowngradedTo50) {
-        return kVersion50;
-    }
-
-    if (version == FeatureCompatibilityParams::Version::kVersion49) {
-        return kVersion49;
-    }
-
-    if (version == FeatureCompatibilityParams::Version::kVersion48) {
-        return kVersion48;
-    }
-
-    if (version == FeatureCompatibilityParams::Version::kVersion47) {
-        return kVersion47;
-    }
-
-    if (version == FeatureCompatibilityParams::Version::kFullyDowngradedTo44) {
-        return kVersion44;
-    }
-    // It is a bug if we hit here.
-    invariant(false, "Invalid version value for feature flag");
-    MONGO_UNREACHABLE
+    multiversion::FeatureCompatibilityVersion version) {
+    switch (version) {
+        case multiversion::FeatureCompatibilityVersion::kVersion_4_4:
+        case multiversion::FeatureCompatibilityVersion::kVersion_4_7:
+        case multiversion::FeatureCompatibilityVersion::kVersion_4_8:
+        case multiversion::FeatureCompatibilityVersion::kVersion_4_9:
+        case multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0:
+        case multiversion::FeatureCompatibilityVersion::kVersion_5_1:
+            return multiversion::toString(version);
+        default:
+            invariant(false, "Invalid version value for feature flag.");
+    }
+
+    MONGO_UNREACHABLE;
 }
 
 Status FeatureCompatibilityVersionParser::validatePreviousVersionField(
-    FeatureCompatibilityParams::Version version) {
-    if (version == FeatureCompatibilityParams::kLatest) {
+    multiversion::FeatureCompatibilityVersion version) {
+    if (version == GenericFCV::kLatest) {
         return Status::OK();
     }
     return Status(ErrorCodes::Error(4926901),
                   "when present, 'previousVersion' field must be the latest binary version");
 }
 
-StatusWith<FeatureCompatibilityParams::Version> FeatureCompatibilityVersionParser::parse(
+StatusWith<multiversion::FeatureCompatibilityVersion> FeatureCompatibilityVersionParser::parse(
     const BSONObj& featureCompatibilityVersionDoc) {
     try {
         auto fcvDoc = FeatureCompatibilityVersionDocument::parse(
@@ -163,8 +116,7 @@ StatusWith<FeatureCompatibilityParams::Version> FeatureCompatibilityVersionParse
         auto previousVersion = fcvDoc.getPreviousVersion();
 
         // Downgrading FCV.
-        if ((version == FeatureCompatibilityParams::kLastLTS ||
-             version == FeatureCompatibilityParams::kLastContinuous) &&
+        if ((version == GenericFCV::kLastLTS || version == GenericFCV::kLastContinuous) &&
             version == targetVersion) {
             // Downgrading FCV must have a "previousVersion" field.
             if (!previousVersion) {
@@ -172,18 +124,18 @@ StatusWith<FeatureCompatibilityParams::Version> FeatureCompatibilityVersionParse
                               str::stream()
                                   << "Missing field "
                                   << FeatureCompatibilityVersionDocument::kPreviousVersionFieldName
-                                  << " in downgrading states for " << kParameterName
+                                  << " in downgrading states for " << multiversion::kParameterName
                                   << " document in "
                                   << NamespaceString::kServerConfigurationNamespace.toString()
                                   << ": " << featureCompatibilityVersionDoc << ". See "
                                   << feature_compatibility_version_documentation::kCompatibilityLink
                                   << ".");
             }
-            if (version == FeatureCompatibilityParams::kLastLTS) {
+            if (version == GenericFCV::kLastLTS) {
                 // Downgrading to last-lts.
-                return FeatureCompatibilityParams::kDowngradingFromLatestToLastLTS;
+                return GenericFCV::kDowngradingFromLatestToLastLTS;
             } else {
-                return FeatureCompatibilityParams::kDowngradingFromLatestToLastContinuous;
+                return GenericFCV::kDowngradingFromLatestToLastContinuous;
             }
         }
 
@@ -193,7 +145,7 @@ StatusWith<FeatureCompatibilityParams::Version> FeatureCompatibilityVersionParse
                           str::stream()
                               << "Unexpected field "
                               << FeatureCompatibilityVersionDocument::kPreviousVersionFieldName
-                              << " in non-downgrading states for " << kParameterName
+                              << " in non-downgrading states for " << multiversion::kParameterName
                               << " document in "
                               << NamespaceString::kServerConfigurationNamespace.toString() << ": "
                               << featureCompatibilityVersionDoc << ". See "
@@ -205,31 +157,30 @@ StatusWith<FeatureCompatibilityParams::Version> FeatureCompatibilityVersionParse
         if (targetVersion) {
             // For upgrading FCV, "targetVersion" must be kLatest or kLastContinuous and "version"
             // must be kLastContinuous or kLastLTS.
-            if (targetVersion == FeatureCompatibilityParams::kLastLTS ||
-                version == ServerGlobalParams::FeatureCompatibility::kLatest) {
+            if (targetVersion == GenericFCV::kLastLTS || version == GenericFCV::kLatest) {
                 return Status(ErrorCodes::Error(4926904),
                               str::stream()
-                                  << "Invalid " << kParameterName << " document in "
+                                  << "Invalid " << multiversion::kParameterName << " document in "
                                   << NamespaceString::kServerConfigurationNamespace.toString()
                                   << ": " << featureCompatibilityVersionDoc << ". See "
                                   << feature_compatibility_version_documentation::kCompatibilityLink
                                   << ".");
             }
 
-            if (version == FeatureCompatibilityParams::kLastLTS) {
-                return targetVersion == FeatureCompatibilityParams::kLastContinuous
-                    ? FeatureCompatibilityParams::kUpgradingFromLastLTSToLastContinuous
-                    : FeatureCompatibilityParams::kUpgradingFromLastLTSToLatest;
+            if (version == GenericFCV::kLastLTS) {
+                return targetVersion == GenericFCV::kLastContinuous
+                    ? GenericFCV::kUpgradingFromLastLTSToLastContinuous
+                    : GenericFCV::kUpgradingFromLastLTSToLatest;
             } else {
                 uassert(5070601,
                         str::stream()
-                            << "Invalid " << kParameterName << " document in "
+                            << "Invalid " << multiversion::kParameterName << " document in "
                             << NamespaceString::kServerConfigurationNamespace.toString() << ": "
                             << featureCompatibilityVersionDoc << ". See "
                             << feature_compatibility_version_documentation::kCompatibilityLink
                             << ".",
-                        version == ServerGlobalParams::FeatureCompatibility::kLastContinuous);
-                return FeatureCompatibilityParams::kUpgradingFromLastContinuousToLatest;
+                        version == GenericFCV::kLastContinuous);
+                return GenericFCV::kUpgradingFromLastContinuousToLatest;
             }
         }
 
@@ -238,7 +189,7 @@ StatusWith<FeatureCompatibilityParams::Version> FeatureCompatibilityVersionParse
     } catch (const DBException& e) {
         auto status = e.toStatus();
         status.addContext(str::stream()
-                          << "Invalid " << kParameterName << " document in "
+                          << "Invalid " << multiversion::kParameterName << " document in "
                           << NamespaceString::kServerConfigurationNamespace.toString() << ": "
                           << featureCompatibilityVersionDoc << ". See "
                           << feature_compatibility_version_documentation::kCompatibilityLink
diff --git a/src/mongo/db/commands/feature_compatibility_version_parser.h b/src/mongo/db/commands/feature_compatibility_version_parser.h
index b20cb3a1b01..1fa8e88ab9b 100644
--- a/src/mongo/db/commands/feature_compatibility_version_parser.h
+++ b/src/mongo/db/commands/feature_compatibility_version_parser.h
@@ -29,95 +29,40 @@
 
 #pragma once
 
-#include "mongo/db/server_options.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
-using FeatureCompatibilityParams = ServerGlobalParams::FeatureCompatibility;
-
 /**
  * Helpers to parse featureCompatibilityVersion document BSON objects into
- * ServerGlobalParams::FeatureCompatibility::Version enums and convert
- * ServerGlobalParams::FeatureCompatibility::Version enums into strings.
+ * multiversion::FeatureCompatibilityVersion enums.
  */
 class FeatureCompatibilityVersionParser {
 public:
-    static constexpr StringData kVersion44 = "4.4"_sd;  // Remove once old feature flags are deleted
-    static constexpr StringData kVersion47 = "4.7"_sd;  // Remove once old feature flags are deleted
-    static constexpr StringData kVersion48 = "4.8"_sd;  // Remove once old feature flags are deleted
-    static constexpr StringData kVersion49 = "4.9"_sd;  // Remove once old feature flags are deleted
-    static constexpr StringData kVersion50 = "5.0"_sd;
-    static constexpr StringData kVersion51 = "5.1"_sd;
-    static constexpr StringData kVersionDowngradingFrom51To50 = "downgrading from 5.1 to 5.0"_sd;
-    static constexpr StringData kVersionUpgradingFrom50To51 = "upgrading from 5.0 to 5.1"_sd;
-    static constexpr StringData kVersionUnset = "Unset"_sd;
-
-    static constexpr StringData kParameterName = "featureCompatibilityVersion"_sd;
-
-    static constexpr StringData kLastLTS = kVersion50;
-    static constexpr StringData kLastContinuous = kVersion50;
-    static constexpr StringData kLatest = kVersion51;
-    static constexpr StringData kUpgradingFromLastLTSToLatest = kVersionUpgradingFrom50To51;
-    static constexpr StringData kUpgradingFromLastContinuousToLatest = kVersionUpgradingFrom50To51;
-    // kVersionUpgradingFromLastLTSToLastContinuous should assigned kVersionUnset when kLastLTS and
-    // kLastContinuous are equal.
-    static constexpr StringData kVersionUpgradingFromLastLTSToLastContinuous = kVersionUnset;
-    static constexpr StringData kDowngradingFromLatestToLastLTS = kVersionDowngradingFrom51To50;
-    static constexpr StringData kDowngradingFromLatestToLastContinuous =
-        kVersionDowngradingFrom51To50;
-
     // Used to verify that FCV values in 'admin.system.version' are valid and equal to one of
     // { lastLTS, lastContinuous, latest }.
-    static FeatureCompatibilityParams::Version parseVersion(StringData versionString);
+    static multiversion::FeatureCompatibilityVersion parseVersion(StringData versionString);
 
     // Used to parse FCV values for feature flags. It is acceptable to have feature flag versions
     // that are not one of { lastLTS, lastContinuous, latest } while the server code is
     // transitioning to the next LTS release. This is to avoid having the upgrade of FCV constants
     // be blocked on old code removal.
-    static FeatureCompatibilityParams::Version parseVersionForFeatureFlags(
+    static multiversion::FeatureCompatibilityVersion parseVersionForFeatureFlags(
         StringData versionString);
 
-    static StringData serializeVersion(FeatureCompatibilityParams::Version version);
+    static StringData serializeVersion(multiversion::FeatureCompatibilityVersion version);
 
-    static StringData serializeVersionForFeatureFlags(FeatureCompatibilityParams::Version version);
+    static StringData serializeVersionForFeatureFlags(
+        multiversion::FeatureCompatibilityVersion version);
 
-    static Status validatePreviousVersionField(FeatureCompatibilityParams::Version version);
+    static Status validatePreviousVersionField(multiversion::FeatureCompatibilityVersion version);
 
     /**
      * Parses the featureCompatibilityVersion document from the server configuration collection
      * (admin.system.version), and returns the state represented by the combination of the
      * targetVersion and version.
      */
-    static StatusWith<FeatureCompatibilityParams::Version> parse(
+    static StatusWith<multiversion::FeatureCompatibilityVersion> parse(
         const BSONObj& featureCompatibilityVersionDoc);
-
-    /**
-     * Useful for message logging.
-     */
-    static StringData toString(FeatureCompatibilityParams::Version version) {
-        if (version == FeatureCompatibilityParams::Version::kUnsetDefault50Behavior) {
-            return kVersionUnset;
-        } else if (version == FeatureCompatibilityParams::kLastLTS) {
-            return kLastLTS;
-        } else if (version == FeatureCompatibilityParams::kDowngradingFromLatestToLastLTS) {
-            return kDowngradingFromLatestToLastLTS;
-        } else if (version == FeatureCompatibilityParams::kUpgradingFromLastLTSToLastContinuous) {
-            // kUpgradingFromLastLTSToLastContinuous is only a valid FCV state when last-continuous
-            // and last-lts are not equal. Otherwise, it is set to kInvalid.
-            invariant(version != FeatureCompatibilityParams::Version::kInvalid);
-            return kVersionUpgradingFromLastLTSToLastContinuous;
-        } else if (version == FeatureCompatibilityParams::kUpgradingFromLastLTSToLatest) {
-            return kUpgradingFromLastLTSToLatest;
-        } else if (version == FeatureCompatibilityParams::kLastContinuous) {
-            return kLastContinuous;
-        } else if (version == FeatureCompatibilityParams::kDowngradingFromLatestToLastContinuous) {
-            return kDowngradingFromLatestToLastContinuous;
-        } else if (version == FeatureCompatibilityParams::kUpgradingFromLastContinuousToLatest) {
-            return kUpgradingFromLastContinuousToLatest;
-        } else if (version == FeatureCompatibilityParams::kLatest) {
-            return kLatest;
-        }
-        MONGO_UNREACHABLE;
-    }
 };
 
 }  // namespace mongo
diff --git a/src/mongo/db/commands/find_and_modify.cpp b/src/mongo/db/commands/find_and_modify.cpp
index 9222576fbe7..e8f2e4f4357 100644
--- a/src/mongo/db/commands/find_and_modify.cpp
+++ b/src/mongo/db/commands/find_and_modify.cpp
@@ -488,7 +488,7 @@ write_ops::FindAndModifyCommandReply CmdFindAndModify::Invocation::writeConflict
     if (updateResult.containsDotsAndDollarsField &&
         serverGlobalParams.featureCompatibility.isVersionInitialized() &&
         serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-            FeatureCompatibilityParams::Version::kFullyDowngradedTo50)) {
+            multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0)) {
         // If it's an upsert, increment 'inserts' metric, otherwise increment 'updates'.
         dotsAndDollarsFieldsCounters.incrementForUpsert(!updateResult.upsertedId.isEmpty());
     }
diff --git a/src/mongo/db/commands/find_cmd.cpp b/src/mongo/db/commands/find_cmd.cpp
index f2df0422be9..a684f314bfe 100644
--- a/src/mongo/db/commands/find_cmd.cpp
+++ b/src/mongo/db/commands/find_cmd.cpp
@@ -82,7 +82,7 @@ std::unique_ptr<FindCommandRequest> translateNtoReturnToLimitOrBatchSize(
             "the ntoreturn find command parameter is not supported when FCV >= 5.1",
             !(fcvState.isVersionInitialized() &&
               fcvState.isGreaterThanOrEqualTo(
-                  ServerGlobalParams::FeatureCompatibility::Version::kVersion51) &&
+                  multiversion::FeatureCompatibilityVersion::kVersion_5_1) &&
               findCmd->getNtoreturn()));
 
     const auto ntoreturn = findCmd->getNtoreturn().get_value_or(0);
diff --git a/src/mongo/db/commands/set_feature_compatibility_version_command.cpp b/src/mongo/db/commands/set_feature_compatibility_version_command.cpp
index ba3fcbf1de1..3c952c922b7 100644
--- a/src/mongo/db/commands/set_feature_compatibility_version_command.cpp
+++ b/src/mongo/db/commands/set_feature_compatibility_version_command.cpp
@@ -75,14 +75,14 @@
 #include "mongo/util/fail_point.h"
 #include "mongo/util/scopeguard.h"
 #include "mongo/util/str.h"
+#include "mongo/util/version/releases.h"
 
 using namespace fmt::literals;
 
 namespace mongo {
 namespace {
 
-using FCVP = FeatureCompatibilityVersionParser;
-using FeatureCompatibility = ServerGlobalParams::FeatureCompatibility;
+using GenericFCV = multiversion::GenericFCV;
 
 MONGO_FAIL_POINT_DEFINE(failUpgrading);
 MONGO_FAIL_POINT_DEFINE(hangWhileUpgrading);
@@ -192,15 +192,18 @@ public:
     std::string help() const override {
         std::stringstream h;
         h << "Set the featureCompatibilityVersion used by this cluster. If set to '"
-          << FCVP::kLastLTS << "', then features introduced in versions greater than '"
-          << FCVP::kLastLTS << "' will be disabled";
-        if (FCVP::kLastContinuous != FCVP::kLastLTS) {
-            h << " If set to '" << FCVP::kLastContinuous << "', then features introduced in '"
-              << FCVP::kLatest << "' will be disabled.";
+          << multiversion::toString(GenericFCV::kLastLTS)
+          << "', then features introduced in versions greater than '"
+          << multiversion::toString(GenericFCV::kLastLTS) << "' will be disabled";
+        if (GenericFCV::kLastContinuous != GenericFCV::kLastLTS) {
+            h << " If set to '" << multiversion::toString(GenericFCV::kLastContinuous)
+              << "', then features introduced in '" << multiversion::toString(GenericFCV::kLatest)
+              << "' will be disabled.";
         }
-        h << " If set to '" << FCVP::kLatest << "', then '" << FCVP::kLatest
+        h << " If set to '" << multiversion::toString(GenericFCV::kLatest) << "', then '"
+          << multiversion::toString(GenericFCV::kLatest)
           << "' features are enabled, and all nodes in the cluster must be binary version "
-          << FCVP::kLatest << ". See "
+          << multiversion::toString(GenericFCV::kLatest) << ". See "
           << feature_compatibility_version_documentation::kCompatibilityLink << ".";
         return h.str();
     }
@@ -254,15 +257,16 @@ public:
         const auto requestedVersion = request.getCommandParameter();
         const auto actualVersion = serverGlobalParams.featureCompatibility.getVersion();
         if (request.getDowngradeOnDiskChanges()) {
-            uassert(
-                ErrorCodes::IllegalOperation,
-                str::stream() << "Cannot set featureCompatibilityVersion to "
-                              << FCVP::serializeVersion(requestedVersion) << " with '"
-                              << SetFeatureCompatibilityVersion::kDowngradeOnDiskChangesFieldName
-                              << "' set to true. This is only allowed when downgrading to "
-                              << FCVP::kLastContinuous,
-                requestedVersion <= actualVersion &&
-                    requestedVersion == FeatureCompatibility::kLastContinuous);
+            uassert(ErrorCodes::IllegalOperation,
+                    str::stream()
+                        << "Cannot set featureCompatibilityVersion to "
+                        << FeatureCompatibilityVersionParser::serializeVersion(requestedVersion)
+                        << " with '"
+                        << SetFeatureCompatibilityVersion::kDowngradeOnDiskChangesFieldName
+                        << "' set to true. This is only allowed when downgrading to "
+                        << multiversion::toString(GenericFCV::kLastContinuous),
+                    requestedVersion <= actualVersion &&
+                        requestedVersion == GenericFCV::kLastContinuous);
         }
 
         if (requestedVersion == actualVersion) {
@@ -408,7 +412,7 @@ private:
 
             // TODO: Remove once FCV 6.0 becomes last-lts
             const auto requestedVersion = request.getCommandParameter();
-            if (requestedVersion >= FeatureCompatibility::Version::kVersion51) {
+            if (requestedVersion >= multiversion::FeatureCompatibilityVersion::kVersion_5_1) {
                 ShardingCatalogManager::get(opCtx)->upgradeMetadataTo51Phase2(opCtx);
             }
 
@@ -442,7 +446,7 @@ private:
         // Secondary indexes on time-series measurements are only supported in 5.1 and up. If the
         // user tries to downgrade the cluster to an earlier version, they must first remove all
         // incompatible secondary indexes on time-series measurements.
-        if (requestedVersion < FeatureCompatibility::Version::kVersion51) {
+        if (requestedVersion < multiversion::FeatureCompatibilityVersion::kVersion_5_1) {
             for (const auto& dbName : DatabaseHolder::get(opCtx)->getNames()) {
                 Lock::DBLock dbLock(opCtx, dbName, MODE_IS);
                 catalog::forEachCollectionFromDb(
@@ -510,7 +514,7 @@ private:
                     opCtx, CommandHelpers::appendMajorityWriteConcern(requestPhase2.toBSON({}))));
 
             // TODO: Remove once FCV 6.0 becomes last-lts
-            if (requestedVersion < FeatureCompatibility::Version::kVersion51) {
+            if (requestedVersion < multiversion::FeatureCompatibilityVersion::kVersion_5_1) {
                 ShardingCatalogManager::get(opCtx)->downgradeMetadataToPre51Phase2(opCtx);
             }
         }
@@ -518,7 +522,7 @@ private:
         hangWhileDowngrading.pauseWhileSet(opCtx);
 
         if (request.getDowngradeOnDiskChanges()) {
-            invariant(requestedVersion == FeatureCompatibility::kLastContinuous);
+            invariant(requestedVersion == GenericFCV::kLastContinuous);
             _downgradeOnDiskChanges();
             LOGV2(4875603, "Downgrade of on-disk format complete.");
         }
@@ -531,7 +535,7 @@ private:
     void _downgradeOnDiskChanges() {
         LOGV2(4975602,
               "Downgrading on-disk format to reflect the last-continuous version.",
-              "last_continuous_version"_attr = FCVP::kLastContinuous);
+              "last_continuous_version"_attr = multiversion::toString(GenericFCV::kLastContinuous));
     }
 
     /**
diff --git a/src/mongo/db/exec/upsert_stage.cpp b/src/mongo/db/exec/upsert_stage.cpp
index 79aa21fdf31..035419f4c39 100644
--- a/src/mongo/db/exec/upsert_stage.cpp
+++ b/src/mongo/db/exec/upsert_stage.cpp
@@ -282,7 +282,7 @@ void UpsertStage::_assertDocumentToBeInsertedIsValid(const mb::Document& documen
         bool allowTopLevelDollarPrefixes =
             serverGlobalParams.featureCompatibility.isVersionInitialized() &&
             serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-                FeatureCompatibilityParams::Version::kFullyDowngradedTo50);
+                multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
         storage_validation::storageValid(document,
                                          allowTopLevelDollarPrefixes,
                                          true, /* Should validate for storage */
diff --git a/src/mongo/db/fcv_op_observer.cpp b/src/mongo/db/fcv_op_observer.cpp
index c2043daa86c..76f9c86692d 100644
--- a/src/mongo/db/fcv_op_observer.cpp
+++ b/src/mongo/db/fcv_op_observer.cpp
@@ -52,16 +52,14 @@ namespace mongo {
 MONGO_FAIL_POINT_DEFINE(pauseBeforeCloseCxns);
 MONGO_FAIL_POINT_DEFINE(finishedDropConnections);
 
-using FeatureCompatibilityParams = ServerGlobalParams::FeatureCompatibility;
-
 void FcvOpObserver::_setVersion(OperationContext* opCtx,
-                                ServerGlobalParams::FeatureCompatibility::Version newVersion,
+                                multiversion::FeatureCompatibilityVersion newVersion,
                                 boost::optional<Timestamp> commitTs) {
     // We set the last FCV update timestamp before setting the new FCV, to make sure we never
     // read an FCV that is not stable.  We might still read a stale one.
     if (commitTs)
         FeatureCompatibilityVersion::advanceLastFCVUpdateTimestamp(*commitTs);
-    boost::optional<FeatureCompatibilityParams::Version> prevVersion;
+    boost::optional<multiversion::FeatureCompatibilityVersion> prevVersion;
 
     if (serverGlobalParams.featureCompatibility.isVersionInitialized()) {
         prevVersion = serverGlobalParams.featureCompatibility.getVersion();
@@ -71,7 +69,7 @@ void FcvOpObserver::_setVersion(OperationContext* opCtx,
 
     // (Generic FCV reference): This FCV check should exist across LTS binary versions.
     if (serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-            FeatureCompatibilityParams::kLatest) ||
+            multiversion::GenericFCV::kLatest) ||
         serverGlobalParams.featureCompatibility.isUpgradingOrDowngrading()) {
         // minWireVersion == maxWireVersion on kLatest FCV or upgrading/downgrading FCV.
         // Close all incoming connections from internal clients with binary versions lower than
@@ -110,13 +108,12 @@ void FcvOpObserver::_setVersion(OperationContext* opCtx,
     // 1. Setting featureCompatibilityVersion from downgrading to fullyDowngraded.
     // 2. Setting featureCompatibilityVersion from fullyDowngraded to upgrading.
     // (Generic FCV reference): This FCV check should exist across LTS binary versions.
-    const auto shouldIncrementTopologyVersion =
-        newVersion == FeatureCompatibilityParams::kLastLTS ||
+    const auto shouldIncrementTopologyVersion = newVersion == multiversion::GenericFCV::kLastLTS ||
         (prevVersion &&
-         prevVersion.get() == FeatureCompatibilityParams::kDowngradingFromLatestToLastContinuous) ||
-        newVersion == FeatureCompatibilityParams::kUpgradingFromLastLTSToLatest ||
-        newVersion == FeatureCompatibilityParams::kUpgradingFromLastContinuousToLatest ||
-        newVersion == FeatureCompatibilityParams::kUpgradingFromLastLTSToLastContinuous;
+         prevVersion.get() == multiversion::GenericFCV::kDowngradingFromLatestToLastContinuous) ||
+        newVersion == multiversion::GenericFCV::kUpgradingFromLastLTSToLatest ||
+        newVersion == multiversion::GenericFCV::kUpgradingFromLastContinuousToLatest ||
+        newVersion == multiversion::GenericFCV::kUpgradingFromLastLTSToLastContinuous;
 
     if (isReplSet && shouldIncrementTopologyVersion) {
         replCoordinator->incrementTopologyVersion();
@@ -126,7 +123,7 @@ void FcvOpObserver::_setVersion(OperationContext* opCtx,
 void FcvOpObserver::_onInsertOrUpdate(OperationContext* opCtx, const BSONObj& doc) {
     auto idElement = doc["_id"];
     if (idElement.type() != BSONType::String ||
-        idElement.String() != FeatureCompatibilityVersionParser::kParameterName) {
+        idElement.String() != multiversion::kParameterName) {
         return;
     }
     auto newVersion = uassertStatusOK(FeatureCompatibilityVersionParser::parse(doc));
@@ -137,12 +134,12 @@ void FcvOpObserver::_onInsertOrUpdate(OperationContext* opCtx, const BSONObj& do
     bool isDifferent = true;
     if (serverGlobalParams.featureCompatibility.isVersionInitialized()) {
         const auto currentVersion = serverGlobalParams.featureCompatibility.getVersion();
-        attrs.add("currentVersion", FeatureCompatibilityVersionParser::toString(currentVersion));
+        attrs.add("currentVersion", multiversion::toString(currentVersion));
         isDifferent = currentVersion != newVersion;
     }
 
     if (isDifferent) {
-        attrs.add("newVersion", FeatureCompatibilityVersionParser::toString(newVersion));
+        attrs.add("newVersion", multiversion::toString(newVersion));
         LOGV2(20459, "Setting featureCompatibilityVersion", attrs);
     }
 
@@ -183,8 +180,7 @@ void FcvOpObserver::onDelete(OperationContext* opCtx,
     invariant(optDocKey, nss.ns());
     if (nss.isServerConfigurationCollection()) {
         auto id = optDocKey.get().getId().firstElement();
-        if (id.type() == BSONType::String &&
-            id.String() == FeatureCompatibilityVersionParser::kParameterName) {
+        if (id.type() == BSONType::String && id.String() == multiversion::kParameterName) {
             uasserted(40670, "removing FeatureCompatibilityVersion document is not allowed");
         }
     }
@@ -193,7 +189,7 @@ void FcvOpObserver::onDelete(OperationContext* opCtx,
 void FcvOpObserver::onReplicationRollback(OperationContext* opCtx,
                                           const RollbackObserverInfo& rbInfo) {
     // Ensures the in-memory and on-disk FCV states are consistent after a rollback.
-    const auto query = BSON("_id" << FeatureCompatibilityVersionParser::kParameterName);
+    const auto query = BSON("_id" << multiversion::kParameterName);
     const auto swFcv = repl::StorageInterface::get(opCtx)->findById(
         opCtx, NamespaceString::kServerConfigurationNamespace, query["_id"]);
     if (swFcv.isOK()) {
@@ -204,8 +200,8 @@ void FcvOpObserver::onReplicationRollback(OperationContext* opCtx,
             auto diskFcv = swVersion.getValue();
             LOGV2(4675801,
                   "Setting featureCompatibilityVersion as part of rollback",
-                  "newVersion"_attr = FeatureCompatibilityVersionParser::toString(diskFcv),
-                  "oldVersion"_attr = FeatureCompatibilityVersionParser::toString(memoryFcv));
+                  "newVersion"_attr = multiversion::toString(diskFcv),
+                  "oldVersion"_attr = multiversion::toString(memoryFcv));
             _setVersion(opCtx, diskFcv);
             // The rollback FCV is already in the stable snapshot.
             FeatureCompatibilityVersion::clearLastFCVUpdateTimestamp();
diff --git a/src/mongo/db/fcv_op_observer.h b/src/mongo/db/fcv_op_observer.h
index f42172c4b07..7de88e944b8 100644
--- a/src/mongo/db/fcv_op_observer.h
+++ b/src/mongo/db/fcv_op_observer.h
@@ -31,6 +31,7 @@
 
 #include "mongo/db/op_observer_noop.h"
 #include "mongo/db/server_options.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 
@@ -197,7 +198,7 @@ private:
      * servers and closing open transactions if necessary. Increments the server TopologyVersion.
      */
     static void _setVersion(OperationContext* opCtx,
-                            ServerGlobalParams::FeatureCompatibility::Version newVersion,
+                            multiversion::FeatureCompatibilityVersion newVersion,
                             boost::optional<Timestamp> commitTs = boost::none);
 
     /**
diff --git a/src/mongo/db/matcher/expression_parser.cpp b/src/mongo/db/matcher/expression_parser.cpp
index 9ed73402765..cd2b1bb2e1a 100644
--- a/src/mongo/db/matcher/expression_parser.cpp
+++ b/src/mongo/db/matcher/expression_parser.cpp
@@ -299,7 +299,7 @@ StatusWithMatchExpression parse(const BSONObj& obj,
                 const auto dotsAndDollarsHint =
                     serverGlobalParams.featureCompatibility.isVersionInitialized() &&
                         serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-                            FeatureCompatibilityParams::Version::kFullyDowngradedTo50)
+                            multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0)
                     ? ". If you have a field name that starts with a '$' symbol, consider using "
                       "$getField or $setField."
                     : "";
diff --git a/src/mongo/db/namespace_string.cpp b/src/mongo/db/namespace_string.cpp
index 6e0868f31c4..0375f5f9900 100644
--- a/src/mongo/db/namespace_string.cpp
+++ b/src/mongo/db/namespace_string.cpp
@@ -172,7 +172,7 @@ bool NamespaceString::isLegalClientSystemNS(
     if (coll() == kSystemDotViewsCollectionName)
         return true;
     if (currentFCV.isGreaterThanOrEqualTo(
-            ServerGlobalParams::FeatureCompatibility::Version::kVersion47) &&
+            multiversion::FeatureCompatibilityVersion::kVersion_4_7) &&
         // While this FCV check is being added in 4.9, the namespace was allowed in 4.7 binaries
         // without an FCV check.
         isTemporaryReshardingCollection()) {
diff --git a/src/mongo/db/op_msg_fuzzer_fixture.cpp b/src/mongo/db/op_msg_fuzzer_fixture.cpp
index a2f6d29eadc..4918aa2468d 100644
--- a/src/mongo/db/op_msg_fuzzer_fixture.cpp
+++ b/src/mongo/db/op_msg_fuzzer_fixture.cpp
@@ -102,8 +102,7 @@ OpMsgFuzzerFixture::OpMsgFuzzerFixture(bool skipGlobalInitializers)
     storageGlobalParams.repair = false;
     serverGlobalParams.enableMajorityReadConcern = false;
     // (Generic FCV reference): Initialize FCV.
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLatest);
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLatest);
 
     initializeStorageEngine(opCtx.get(),
                             StorageEngineInitFlags::kAllowNoLockFile |
diff --git a/src/mongo/db/ops/insert.cpp b/src/mongo/db/ops/insert.cpp
index e0accaac460..85edc50cfb4 100644
--- a/src/mongo/db/ops/insert.cpp
+++ b/src/mongo/db/ops/insert.cpp
@@ -112,7 +112,7 @@ StatusWith<BSONObj> fixDocumentForInsert(OperationContext* opCtx,
             if (fieldName[0] == '$') {
                 if (!serverGlobalParams.featureCompatibility.isVersionInitialized() ||
                     !serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-                        FeatureCompatibilityParams::Version::kFullyDowngradedTo50)) {
+                        multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0)) {
                     return StatusWith<BSONObj>(ErrorCodes::BadValue,
                                                str::stream()
                                                    << "Document can't have $ prefixed field names: "
diff --git a/src/mongo/db/pipeline/accumulation_statement.cpp b/src/mongo/db/pipeline/accumulation_statement.cpp
index 3e83633e018..18cca9fd32a 100644
--- a/src/mongo/db/pipeline/accumulation_statement.cpp
+++ b/src/mongo/db/pipeline/accumulation_statement.cpp
@@ -47,16 +47,15 @@ using std::string;
 
 namespace {
 // Used to keep track of which Accumulators are registered under which name.
-using ParserRegistration =
-    std::pair<AccumulationStatement::Parser,
-              boost::optional<ServerGlobalParams::FeatureCompatibility::Version>>;
+using ParserRegistration = std::pair<AccumulationStatement::Parser,
+                                     boost::optional<multiversion::FeatureCompatibilityVersion>>;
 static StringMap<ParserRegistration> parserMap;
 }  // namespace
 
 void AccumulationStatement::registerAccumulator(
     std::string name,
     AccumulationStatement::Parser parser,
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion) {
+    boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion) {
     auto it = parserMap.find(name);
     massert(28722,
             str::stream() << "Duplicate accumulator (" << name << ") registered.",
@@ -65,8 +64,7 @@ void AccumulationStatement::registerAccumulator(
 }
 
 AccumulationStatement::Parser& AccumulationStatement::getParser(
-    StringData name,
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version> allowedMaxVersion) {
+    StringData name, boost::optional<multiversion::FeatureCompatibilityVersion> allowedMaxVersion) {
     auto it = parserMap.find(name);
     uassert(
         15952, str::stream() << "unknown group operator '" << name << "'", it != parserMap.end());
diff --git a/src/mongo/db/pipeline/accumulation_statement.h b/src/mongo/db/pipeline/accumulation_statement.h
index 2d9ed8de52e..7144ada54fc 100644
--- a/src/mongo/db/pipeline/accumulation_statement.h
+++ b/src/mongo/db/pipeline/accumulation_statement.h
@@ -192,7 +192,7 @@ public:
     static void registerAccumulator(
         std::string name,
         Parser parser,
-        boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion);
+        boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion);
 
     /**
      * Retrieves the Parser for the accumulator specified by the given name, and raises an error if
@@ -201,7 +201,7 @@ public:
      */
     static Parser& getParser(
         StringData name,
-        boost::optional<ServerGlobalParams::FeatureCompatibility::Version> allowedMaxVersion);
+        boost::optional<multiversion::FeatureCompatibilityVersion> allowedMaxVersion);
 
     // The field name is used to store the results of the accumulation in a result document.
     std::string fieldName;
diff --git a/src/mongo/db/pipeline/accumulator_multi.cpp b/src/mongo/db/pipeline/accumulator_multi.cpp
index 8284f1a9a20..4c27b381df3 100644
--- a/src/mongo/db/pipeline/accumulator_multi.cpp
+++ b/src/mongo/db/pipeline/accumulator_multi.cpp
@@ -28,47 +28,45 @@
  */
 
 #include "mongo/db/pipeline/accumulator_multi.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 using FirstLastSense = AccumulatorFirstLastN::Sense;
 using MinMaxSense = AccumulatorMinMax::Sense;
 
-REGISTER_ACCUMULATOR_WITH_MIN_VERSION(
-    maxN,
-    AccumulatorMinMaxN::parseMinMaxN<MinMaxSense::kMax>,
-    ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
-REGISTER_ACCUMULATOR_WITH_MIN_VERSION(
-    minN,
-    AccumulatorMinMaxN::parseMinMaxN<MinMaxSense::kMin>,
-    ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+REGISTER_ACCUMULATOR_WITH_MIN_VERSION(maxN,
+                                      AccumulatorMinMaxN::parseMinMaxN<MinMaxSense::kMax>,
+                                      multiversion::FeatureCompatibilityVersion::kVersion_5_1);
+REGISTER_ACCUMULATOR_WITH_MIN_VERSION(minN,
+                                      AccumulatorMinMaxN::parseMinMaxN<MinMaxSense::kMin>,
+                                      multiversion::FeatureCompatibilityVersion::kVersion_5_1);
 REGISTER_EXPRESSION_WITH_MIN_VERSION(maxN,
                                      AccumulatorMinMaxN::parseExpression<MinMaxSense::kMax>,
                                      AllowedWithApiStrict::kNeverInVersion1,
                                      AllowedWithClientType::kAny,
-                                     ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+                                     multiversion::FeatureCompatibilityVersion::kVersion_5_1);
 REGISTER_EXPRESSION_WITH_MIN_VERSION(minN,
                                      AccumulatorMinMaxN::parseExpression<MinMaxSense::kMin>,
                                      AllowedWithApiStrict::kNeverInVersion1,
                                      AllowedWithClientType::kAny,
-                                     ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+                                     multiversion::FeatureCompatibilityVersion::kVersion_5_1);
 REGISTER_ACCUMULATOR_WITH_MIN_VERSION(
     firstN,
     AccumulatorFirstLastN::parseFirstLastN<FirstLastSense::kFirst>,
-    ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
-REGISTER_ACCUMULATOR_WITH_MIN_VERSION(
-    lastN,
-    AccumulatorFirstLastN::parseFirstLastN<FirstLastSense::kLast>,
-    ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+    multiversion::FeatureCompatibilityVersion::kVersion_5_1);
+REGISTER_ACCUMULATOR_WITH_MIN_VERSION(lastN,
+                                      AccumulatorFirstLastN::parseFirstLastN<FirstLastSense::kLast>,
+                                      multiversion::FeatureCompatibilityVersion::kVersion_5_1);
 REGISTER_EXPRESSION_WITH_MIN_VERSION(firstN,
                                      AccumulatorFirstLastN::parseExpression<FirstLastSense::kFirst>,
                                      AllowedWithApiStrict::kNeverInVersion1,
                                      AllowedWithClientType::kAny,
-                                     ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+                                     multiversion::FeatureCompatibilityVersion::kVersion_5_1);
 REGISTER_EXPRESSION_WITH_MIN_VERSION(lastN,
                                      AccumulatorFirstLastN::parseExpression<FirstLastSense::kLast>,
                                      AllowedWithApiStrict::kNeverInVersion1,
                                      AllowedWithClientType::kAny,
-                                     ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+                                     multiversion::FeatureCompatibilityVersion::kVersion_5_1);
 // TODO SERVER-57884 Add $firstN/$lastN as window functions.
 
 AccumulatorN::AccumulatorN(ExpressionContext* const expCtx)
diff --git a/src/mongo/db/pipeline/accumulator_sum.cpp b/src/mongo/db/pipeline/accumulator_sum.cpp
index 8322048df55..fca549e28d0 100644
--- a/src/mongo/db/pipeline/accumulator_sum.cpp
+++ b/src/mongo/db/pipeline/accumulator_sum.cpp
@@ -49,8 +49,9 @@ using boost::intrusive_ptr;
 REGISTER_ACCUMULATOR(sum, genericParseSingleExpressionAccumulator<AccumulatorSum>);
 REGISTER_STABLE_EXPRESSION(sum, ExpressionFromAccumulator<AccumulatorSum>::parse);
 REGISTER_REMOVABLE_WINDOW_FUNCTION(sum, AccumulatorSum, WindowFunctionSum);
-REGISTER_ACCUMULATOR_WITH_MIN_VERSION(
-    count, parseCountAccumulator, ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+REGISTER_ACCUMULATOR_WITH_MIN_VERSION(count,
+                                      parseCountAccumulator,
+                                      multiversion::FeatureCompatibilityVersion::kVersion_5_1);
 
 REGISTER_WINDOW_FUNCTION(count, window_function::parseCountWindowFunction);
 
diff --git a/src/mongo/db/pipeline/document_source.cpp b/src/mongo/db/pipeline/document_source.cpp
index 3a75c9606f1..b4cf3a59362 100644
--- a/src/mongo/db/pipeline/document_source.cpp
+++ b/src/mongo/db/pipeline/document_source.cpp
@@ -68,7 +68,7 @@ DocumentSource::DocumentSource(const StringData stageName,
 namespace {
 struct ParserRegistration {
     Parser parser;
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion;
+    boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion;
 };
 // Used to keep track of which DocumentSources are registered under which name.
 static StringMap<ParserRegistration> parserMap;
@@ -77,7 +77,7 @@ static StringMap<ParserRegistration> parserMap;
 void DocumentSource::registerParser(
     string name,
     Parser parser,
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion) {
+    boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion) {
     auto it = parserMap.find(name);
     massert(28707,
             str::stream() << "Duplicate document source (" << name << ") registered.",
@@ -87,7 +87,7 @@ void DocumentSource::registerParser(
 void DocumentSource::registerParser(
     string name,
     SimpleParser simpleParser,
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion) {
+    boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion) {
 
     Parser parser =
         [simpleParser = std::move(simpleParser)](
diff --git a/src/mongo/db/pipeline/document_source.h b/src/mongo/db/pipeline/document_source.h
index bd4be19059e..9ab0990f880 100644
--- a/src/mongo/db/pipeline/document_source.h
+++ b/src/mongo/db/pipeline/document_source.h
@@ -409,7 +409,7 @@ public:
     static void registerParser(
         std::string name,
         Parser parser,
-        boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion);
+        boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion);
     /**
      * Convenience wrapper for the common case, when DocumentSource::Parser returns a list of one
      * DocumentSource.
@@ -420,7 +420,7 @@ public:
     static void registerParser(
         std::string name,
         SimpleParser simpleParser,
-        boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion);
+        boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion);
 
     /**
      * Returns true if the DocumentSource has a query.
diff --git a/src/mongo/db/pipeline/document_source_densify.cpp b/src/mongo/db/pipeline/document_source_densify.cpp
index d48c3bbfbf5..2d6dc1aacd3 100644
--- a/src/mongo/db/pipeline/document_source_densify.cpp
+++ b/src/mongo/db/pipeline/document_source_densify.cpp
@@ -110,7 +110,7 @@ REGISTER_DOCUMENT_SOURCE_CONDITIONALLY(
     document_source_densify::createFromBson,
     AllowedWithApiStrict::kNeverInVersion1,
     AllowedWithClientType::kAny,
-    ServerGlobalParams::FeatureCompatibility::Version::kVersion51,
+    multiversion::FeatureCompatibilityVersion::kVersion_5_1,
     ::mongo::feature_flags::gFeatureFlagDensify.isEnabledAndIgnoreFCV());
 
 REGISTER_DOCUMENT_SOURCE_CONDITIONALLY(
@@ -119,7 +119,7 @@ REGISTER_DOCUMENT_SOURCE_CONDITIONALLY(
     DocumentSourceInternalDensify::createFromBson,
     AllowedWithApiStrict::kInternal,
     AllowedWithClientType::kInternal,
-    ServerGlobalParams::FeatureCompatibility::Version::kVersion51,
+    multiversion::FeatureCompatibilityVersion::kVersion_5_1,
     ::mongo::feature_flags::gFeatureFlagDensify.isEnabledAndIgnoreFCV());
 
 namespace document_source_densify {
diff --git a/src/mongo/db/pipeline/document_source_lookup.cpp b/src/mongo/db/pipeline/document_source_lookup.cpp
index c1850127909..4f42c0a7f32 100644
--- a/src/mongo/db/pipeline/document_source_lookup.cpp
+++ b/src/mongo/db/pipeline/document_source_lookup.cpp
@@ -1022,7 +1022,7 @@ void DocumentSourceLookUp::serializeToArrayWithBothSyntaxes(
 void DocumentSourceLookUp::serializeToArray(
     std::vector<Value>& array, boost::optional<ExplainOptions::Verbosity> explain) const {
     if (serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-            FeatureCompatibilityParams::Version::kVersion49)) {
+            multiversion::FeatureCompatibilityVersion::kVersion_4_9)) {
         return serializeToArrayWithBothSyntaxes(array, explain);
     }
 
@@ -1258,7 +1258,7 @@ intrusive_ptr<DocumentSource> DocumentSourceLookUp::createFromBson(
                 "$lookup with 'pipeline' may not specify 'localField' or 'foreignField'",
                 (localField.empty() && foreignField.empty()) ||
                     serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-                        FeatureCompatibilityParams::Version::kVersion49));
+                        multiversion::FeatureCompatibilityVersion::kVersion_4_9));
 
         if (localField.empty() && foreignField.empty()) {
             // $lookup specified with only pipeline syntax.
diff --git a/src/mongo/db/pipeline/document_source_set_window_fields.cpp b/src/mongo/db/pipeline/document_source_set_window_fields.cpp
index eaee99d5b82..0df6d6d5927 100644
--- a/src/mongo/db/pipeline/document_source_set_window_fields.cpp
+++ b/src/mongo/db/pipeline/document_source_set_window_fields.cpp
@@ -78,14 +78,14 @@ REGISTER_DOCUMENT_SOURCE_WITH_MIN_VERSION(
     LiteParsedDocumentSourceDefault::parse,
     document_source_set_window_fields::createFromBson,
     AllowedWithApiStrict::kNeverInVersion1,
-    ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50);
+    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
 
 REGISTER_DOCUMENT_SOURCE_WITH_MIN_VERSION(
     _internalSetWindowFields,
     LiteParsedDocumentSourceDefault::parse,
     DocumentSourceInternalSetWindowFields::createFromBson,
     AllowedWithApiStrict::kNeverInVersion1,
-    ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50);
+    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
 
 list<intrusive_ptr<DocumentSource>> document_source_set_window_fields::createFromBson(
     BSONElement elem, const intrusive_ptr<ExpressionContext>& expCtx) {
diff --git a/src/mongo/db/pipeline/expression.cpp b/src/mongo/db/pipeline/expression.cpp
index 6ad34ec8740..77fb65b1eef 100644
--- a/src/mongo/db/pipeline/expression.cpp
+++ b/src/mongo/db/pipeline/expression.cpp
@@ -112,7 +112,7 @@ struct ParserRegistration {
     Parser parser;
     AllowedWithApiStrict allowedWithApiStrict;
     AllowedWithClientType allowedWithClientType;
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion;
+    boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion;
 };
 
 /**
@@ -175,7 +175,7 @@ void Expression::registerExpression(
     Parser parser,
     AllowedWithApiStrict allowedWithApiStrict,
     AllowedWithClientType allowedWithClientType,
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion) {
+    boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion) {
     auto op = parserMap.find(key);
     massert(17064,
             str::stream() << "Duplicate expression (" << key << ") registered.",
@@ -7395,7 +7395,7 @@ REGISTER_EXPRESSION_WITH_MIN_VERSION(
     ExpressionGetField::parse,
     AllowedWithApiStrict::kNeverInVersion1,
     AllowedWithClientType::kAny,
-    ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50);
+    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
 
 intrusive_ptr<Expression> ExpressionGetField::parse(ExpressionContext* const expCtx,
                                                     BSONElement expr,
@@ -7507,7 +7507,7 @@ REGISTER_EXPRESSION_WITH_MIN_VERSION(
     ExpressionSetField::parse,
     AllowedWithApiStrict::kNeverInVersion1,
     AllowedWithClientType::kAny,
-    ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50);
+    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
 
 // $unsetField is syntactic sugar for $setField where value is set to $$REMOVE.
 REGISTER_EXPRESSION_WITH_MIN_VERSION(
@@ -7515,7 +7515,7 @@ REGISTER_EXPRESSION_WITH_MIN_VERSION(
     ExpressionSetField::parse,
     AllowedWithApiStrict::kNeverInVersion1,
     AllowedWithClientType::kAny,
-    ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50);
+    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
 
 intrusive_ptr<Expression> ExpressionSetField::parse(ExpressionContext* const expCtx,
                                                     BSONElement expr,
@@ -7651,7 +7651,7 @@ REGISTER_EXPRESSION_WITH_MIN_VERSION(
     ExpressionTsSecond::parse,
     AllowedWithApiStrict::kNeverInVersion1,
     AllowedWithClientType::kAny,
-    ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50);
+    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
 
 /* ------------------------- ExpressionTsIncrement ----------------------------- */
 
@@ -7675,7 +7675,7 @@ REGISTER_EXPRESSION_WITH_MIN_VERSION(
     ExpressionTsIncrement::parse,
     AllowedWithApiStrict::kNeverInVersion1,
     AllowedWithClientType::kAny,
-    ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50);
+    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
 
 MONGO_INITIALIZER_GROUP(BeginExpressionRegistration, ("default"), ("EndExpressionRegistration"))
 MONGO_INITIALIZER_GROUP(EndExpressionRegistration, ("BeginExpressionRegistration"), ())
diff --git a/src/mongo/db/pipeline/expression.h b/src/mongo/db/pipeline/expression.h
index 041c3cbe794..a0a2d08bdee 100644
--- a/src/mongo/db/pipeline/expression.h
+++ b/src/mongo/db/pipeline/expression.h
@@ -298,7 +298,7 @@ public:
         Parser parser,
         AllowedWithApiStrict allowedWithApiStrict,
         AllowedWithClientType allowedWithClientType,
-        boost::optional<ServerGlobalParams::FeatureCompatibility::Version> requiredMinVersion);
+        boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion);
 
     const auto& getChildren() const {
         return _children;
diff --git a/src/mongo/db/pipeline/expression_context.h b/src/mongo/db/pipeline/expression_context.h
index e923a9e9f46..8a5b82f0254 100644
--- a/src/mongo/db/pipeline/expression_context.h
+++ b/src/mongo/db/pipeline/expression_context.h
@@ -394,8 +394,7 @@ public:
     long long subPipelineDepth = 0;
 
     // If set, this will disallow use of features introduced in versions above the provided version.
-    boost::optional<ServerGlobalParams::FeatureCompatibility::Version>
-        maxFeatureCompatibilityVersion;
+    boost::optional<multiversion::FeatureCompatibilityVersion> maxFeatureCompatibilityVersion;
 
     // True if this ExpressionContext is used to parse a view definition pipeline.
     bool isParsingViewDefinition = false;
diff --git a/src/mongo/db/pipeline/field_path.cpp b/src/mongo/db/pipeline/field_path.cpp
index 6a78400d9cc..120525e1230 100644
--- a/src/mongo/db/pipeline/field_path.cpp
+++ b/src/mongo/db/pipeline/field_path.cpp
@@ -100,7 +100,7 @@ void FieldPath::uassertValidFieldName(StringData fieldName) {
     const auto dotsAndDollarsHint =
         serverGlobalParams.featureCompatibility.isVersionInitialized() &&
             serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-                FeatureCompatibilityParams::Version::kFullyDowngradedTo50)
+                multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0)
         ? " Consider using $getField or $setField."
         : "";
 
diff --git a/src/mongo/db/pipeline/sharded_agg_helpers.cpp b/src/mongo/db/pipeline/sharded_agg_helpers.cpp
index 165daf1332c..bfe7d621fc6 100644
--- a/src/mongo/db/pipeline/sharded_agg_helpers.cpp
+++ b/src/mongo/db/pipeline/sharded_agg_helpers.cpp
@@ -142,7 +142,7 @@ BSONObj genericTransformForShards(MutableDocument&& cmdForShards,
     // TODO SERVER-52900 This code can be remove when we branch for the next LTS release.
     if (serverGlobalParams.clusterRole == ClusterRole::ShardServer &&
         !serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-            ServerGlobalParams::FeatureCompatibility::Version::kVersion49)) {
+            multiversion::FeatureCompatibilityVersion::kVersion_4_9)) {
         // A mixed version cluster. Use the old format to be sure it is understood.
         auto [legacyRuntimeConstants, unusedSerializedVariables] =
             expCtx->variablesParseState.transitionalCompatibilitySerialize(expCtx->variables);
diff --git a/src/mongo/db/repl/initial_syncer.cpp b/src/mongo/db/repl/initial_syncer.cpp
index 27aa7335f65..5820d2e2ab5 100644
--- a/src/mongo/db/repl/initial_syncer.cpp
+++ b/src/mongo/db/repl/initial_syncer.cpp
@@ -76,6 +76,7 @@
 #include "mongo/util/system_clock_source.h"
 #include "mongo/util/time_support.h"
 #include "mongo/util/timer.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 namespace repl {
@@ -1060,7 +1061,7 @@ void InitialSyncer::_lastOplogEntryFetcherCallbackForBeginApplyingTimestamp(
     BSONObjBuilder queryBob;
     queryBob.append("find", NamespaceString::kServerConfigurationNamespace.coll());
     auto filterBob = BSONObjBuilder(queryBob.subobjStart("filter"));
-    filterBob.append("_id", FeatureCompatibilityVersionParser::kParameterName);
+    filterBob.append("_id", multiversion::kParameterName);
     filterBob.done();
     // As part of reading the FCV, we ensure the source node's all_durable timestamp has advanced
     // to at least the timestamp of the last optime that we found in the lastOplogEntryFetcher.
@@ -1140,7 +1141,7 @@ void InitialSyncer::_fcvFetcherCallback(const StatusWith<Fetcher::QueryResponse>
             lock,
             Status(ErrorCodes::IncompatibleServerVersion,
                    str::stream() << "Sync source had unsafe feature compatibility version: "
-                                 << FeatureCompatibilityVersionParser::toString(version)));
+                                 << multiversion::toString(version)));
         return;
     }
 
diff --git a/src/mongo/db/repl/initial_syncer_test.cpp b/src/mongo/db/repl/initial_syncer_test.cpp
index d026f108fb1..9661a12cdef 100644
--- a/src/mongo/db/repl/initial_syncer_test.cpp
+++ b/src/mongo/db/repl/initial_syncer_test.cpp
@@ -74,6 +74,7 @@
 #include "mongo/util/fail_point.h"
 #include "mongo/util/scopeguard.h"
 #include "mongo/util/str.h"
+#include "mongo/util/version/releases.h"
 
 #include "mongo/logv2/log.h"
 #include "mongo/unittest/barrier.h"
@@ -666,14 +667,14 @@ void assertFCVRequest(RemoteCommandRequest request) {
         << request.toString();
     ASSERT_EQUALS(NamespaceString::kServerConfigurationNamespace.coll(),
                   request.cmdObj.getStringField("find"));
-    ASSERT_BSONOBJ_EQ(BSON("_id" << FeatureCompatibilityVersionParser::kParameterName),
+    ASSERT_BSONOBJ_EQ(BSON("_id" << multiversion::kParameterName),
                       request.cmdObj.getObjectField("filter"));
 }
 
 void InitialSyncerTest::processSuccessfulFCVFetcherResponseLastLTS() {
     FeatureCompatibilityVersionDocument fcvDoc;
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-    fcvDoc.setVersion(ServerGlobalParams::FeatureCompatibility::kLastLTS);
+    fcvDoc.setVersion(multiversion::GenericFCV::kLastLTS);
     processSuccessfulFCVFetcherResponse({fcvDoc.toBSON()});
 }
 
@@ -1925,7 +1926,7 @@ TEST_F(InitialSyncerTest,
        InitialSyncerReturnsTooManyMatchingDocumentsWhenFCVFetcherReturnsMultipleDocuments) {
     FeatureCompatibilityVersionDocument fcvDoc;
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-    fcvDoc.setVersion(ServerGlobalParams::FeatureCompatibility::kLastLTS);
+    fcvDoc.setVersion(multiversion::GenericFCV::kLastLTS);
     auto docs = {fcvDoc.toBSON(),
                  BSON("_id"
                       << "other")};
@@ -1936,8 +1937,8 @@ TEST_F(InitialSyncerTest,
        InitialSyncerReturnsIncompatibleServerVersionWhenFCVFetcherReturnsUpgradeTargetVersion) {
     FeatureCompatibilityVersionDocument fcvDoc;
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-    fcvDoc.setVersion(ServerGlobalParams::FeatureCompatibility::kLastLTS);
-    fcvDoc.setTargetVersion(ServerGlobalParams::FeatureCompatibility::kLatest);
+    fcvDoc.setVersion(multiversion::GenericFCV::kLastLTS);
+    fcvDoc.setTargetVersion(multiversion::GenericFCV::kLatest);
     runInitialSyncWithBadFCVResponse({fcvDoc.toBSON()}, ErrorCodes::IncompatibleServerVersion);
 }
 
@@ -1945,15 +1946,16 @@ TEST_F(InitialSyncerTest,
        InitialSyncerReturnsIncompatibleServerVersionWhenFCVFetcherReturnsDowngradeTargetVersion) {
     FeatureCompatibilityVersionDocument fcvDoc;
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-    fcvDoc.setVersion(ServerGlobalParams::FeatureCompatibility::kLastLTS);
-    fcvDoc.setTargetVersion(ServerGlobalParams::FeatureCompatibility::kLastLTS);
-    fcvDoc.setPreviousVersion(ServerGlobalParams::FeatureCompatibility::kLatest);
+    fcvDoc.setVersion(multiversion::GenericFCV::kLastLTS);
+    fcvDoc.setTargetVersion(multiversion::GenericFCV::kLastLTS);
+    fcvDoc.setPreviousVersion(multiversion::GenericFCV::kLatest);
     runInitialSyncWithBadFCVResponse({fcvDoc.toBSON()}, ErrorCodes::IncompatibleServerVersion);
 }
 
 TEST_F(InitialSyncerTest, InitialSyncerReturnsParseErrorWhenFCVFetcherReturnsNoVersion) {
-    auto docs = {BSON("_id" << FeatureCompatibilityVersionParser::kParameterName << "targetVersion"
-                            << FeatureCompatibilityVersionParser::kLatest)};
+    // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
+    auto docs = {BSON("_id" << multiversion::kParameterName << "targetVersion"
+                            << multiversion::toString(multiversion::GenericFCV::kLatest))};
     runInitialSyncWithBadFCVResponse(docs, ((ErrorCodes::Error)40414));
 }
 
@@ -1986,7 +1988,7 @@ TEST_F(InitialSyncerTest, InitialSyncerSucceedsWhenFCVFetcherReturnsOldVersion)
 
         FeatureCompatibilityVersionDocument fcvDoc;
         // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-        fcvDoc.setVersion(ServerGlobalParams::FeatureCompatibility::kLastLTS);
+        fcvDoc.setVersion(multiversion::GenericFCV::kLastLTS);
         processSuccessfulFCVFetcherResponse({fcvDoc.toBSON()});
     }
 
@@ -2024,7 +2026,7 @@ TEST_F(
     // This is what we want to test.
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
     FeatureCompatibilityVersionDocument fcvDoc;
-    fcvDoc.setVersion(ServerGlobalParams::FeatureCompatibility::kLastLTS);
+    fcvDoc.setVersion(multiversion::GenericFCV::kLastLTS);
     _mock
         ->expect([](auto& request) { return request["find"].str() == "system.version"; },
                  makeCursorResponse(
diff --git a/src/mongo/db/repl/oplog.cpp b/src/mongo/db/repl/oplog.cpp
index 27d7901157d..1c48b3efd87 100644
--- a/src/mongo/db/repl/oplog.cpp
+++ b/src/mongo/db/repl/oplog.cpp
@@ -1153,7 +1153,7 @@ Status applyOperation_inlock(OperationContext* opCtx,
         requestNss == NamespaceString::kServerConfigurationNamespace) {
         std::string oID;
         auto status = bsonExtractStringField(o, "_id", &oID);
-        if (status.isOK() && oID == FeatureCompatibilityVersionParser::kParameterName) {
+        if (status.isOK() && oID == multiversion::kParameterName) {
             return Status(ErrorCodes::OplogOperationUnsupported,
                           str::stream() << "Applying operation on feature compatibility version "
                                            "document not supported in initial sync: "
diff --git a/src/mongo/db/repl/oplog_applier_impl_test.cpp b/src/mongo/db/repl/oplog_applier_impl_test.cpp
index eef15241e05..9996da62a0e 100644
--- a/src/mongo/db/repl/oplog_applier_impl_test.cpp
+++ b/src/mongo/db/repl/oplog_applier_impl_test.cpp
@@ -2366,7 +2366,7 @@ TEST_F(OplogApplierImplTest, FailOnInsertFCVDocument) {
         ReplicationCoordinator::get(_opCtx.get())->setFollowerMode(MemberState::RS_RECOVERING));
 
     auto op = makeInsertDocumentOplogEntry(
-        nextOpTime(), fcvNS, BSON("_id" << FeatureCompatibilityVersionParser::kParameterName));
+        nextOpTime(), fcvNS, BSON("_id" << multiversion::kParameterName));
     ASSERT_EQUALS(runOpInitialSync(op), ErrorCodes::OplogOperationUnsupported);
 }
 
diff --git a/src/mongo/db/repl/oplog_applier_impl_test_fixture.cpp b/src/mongo/db/repl/oplog_applier_impl_test_fixture.cpp
index 9a2bc34390f..676622692c4 100644
--- a/src/mongo/db/repl/oplog_applier_impl_test_fixture.cpp
+++ b/src/mongo/db/repl/oplog_applier_impl_test_fixture.cpp
@@ -176,8 +176,7 @@ void OplogApplierImplTest::setUp() {
     // test fixture does not create a featureCompatibilityVersion document from which to initialize
     // the server parameter.
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLatest);
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLatest);
 
     // This is necessary to generate ghost timestamps for index builds that are not 0, since 0 is an
     // invalid timestamp.
diff --git a/src/mongo/db/repl/tenant_migration_recipient_service.cpp b/src/mongo/db/repl/tenant_migration_recipient_service.cpp
index e996689c44b..18f89eb2eb3 100644
--- a/src/mongo/db/repl/tenant_migration_recipient_service.cpp
+++ b/src/mongo/db/repl/tenant_migration_recipient_service.cpp
@@ -1901,7 +1901,7 @@ void TenantMigrationRecipientService::Instance::_compareRecipientAndDonorFCV() c
 
     auto donorFCVbson =
         _client->findOne(NamespaceString::kServerConfigurationNamespace.ns(),
-                         BSON("_id" << FeatureCompatibilityVersionParser::kParameterName),
+                         BSON("_id" << multiversion::kParameterName),
                          Query(),
                          nullptr,
                          QueryOption_SecondaryOk,
diff --git a/src/mongo/db/repl/tenant_migration_recipient_service_test.cpp b/src/mongo/db/repl/tenant_migration_recipient_service_test.cpp
index 0b44a1155f3..a303a3cc442 100644
--- a/src/mongo/db/repl/tenant_migration_recipient_service_test.cpp
+++ b/src/mongo/db/repl/tenant_migration_recipient_service_test.cpp
@@ -445,9 +445,9 @@ protected:
      * Sets the FCV on the donor so that it can respond to FCV requests appropriately.
      * (Generic FCV reference): This FCV reference should exist across LTS binary versions.
      */
-    void setDonorFCV(const TenantMigrationRecipientService::Instance* instance,
-                     ServerGlobalParams::FeatureCompatibility::Version version =
-                         ServerGlobalParams::FeatureCompatibility::kLatest) {
+    void setDonorFCV(
+        const TenantMigrationRecipientService::Instance* instance,
+        multiversion::FeatureCompatibilityVersion version = multiversion::GenericFCV::kLatest) {
         auto fcvDoc = FeatureCompatibilityVersionDocument(version);
         auto client = getClient(instance);
         client->insert(NamespaceString::kServerConfigurationNamespace.ns(), fcvDoc.toBSON());
@@ -3203,8 +3203,7 @@ TEST_F(TenantMigrationRecipientServiceTest,
     // Add an FCV value as if it was from a previous attempt, making sure we set a different
     // version from the one we currently have.
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-    initialStateDocument.setRecipientPrimaryStartingFCV(
-        ServerGlobalParams::FeatureCompatibility::kLastLTS);
+    initialStateDocument.setRecipientPrimaryStartingFCV(multiversion::GenericFCV::kLastLTS);
 
     // Create and start the instance.
     auto opCtx = makeOperationContext();
@@ -3257,7 +3256,7 @@ TEST_F(TenantMigrationRecipientServiceTest,
     // Set the donor FCV to be different from 'latest'.
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
     connFp->waitForTimesEntered(initialTimesEntered + 1);
-    setDonorFCV(instance.get(), ServerGlobalParams::FeatureCompatibility::kLastContinuous);
+    setDonorFCV(instance.get(), multiversion::GenericFCV::kLastContinuous);
     connFp->setMode(FailPoint::off);
 
     // Wait for task completion failure.
diff --git a/src/mongo/db/s/config/sharding_catalog_manager_add_shard_test.cpp b/src/mongo/db/s/config/sharding_catalog_manager_add_shard_test.cpp
index e47bebc388c..9a4223c1b30 100644
--- a/src/mongo/db/s/config/sharding_catalog_manager_add_shard_test.cpp
+++ b/src/mongo/db/s/config/sharding_catalog_manager_add_shard_test.cpp
@@ -56,6 +56,7 @@
 #include "mongo/s/write_ops/batched_command_response.h"
 #include "mongo/util/fail_point.h"
 #include "mongo/util/scopeguard.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 namespace {
@@ -136,7 +137,7 @@ protected:
                                               StatusWith<BSONObj> response,
                                               BSONObj writeConcern) {
         // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-        SetFeatureCompatibilityVersion fcvCmd(ServerGlobalParams::FeatureCompatibility::kLatest);
+        SetFeatureCompatibilityVersion fcvCmd(multiversion::GenericFCV::kLatest);
         fcvCmd.setFromConfigServer(true);
         fcvCmd.setDbName(NamespaceString::kAdminDb);
         const auto setFcvObj = fcvCmd.toBSON(BSON("writeConcern" << writeConcern));
diff --git a/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp b/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp
index 9be5bd179ee..525d3385b9a 100644
--- a/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp
+++ b/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp
@@ -80,6 +80,7 @@
 #include "mongo/util/fail_point.h"
 #include "mongo/util/scopeguard.h"
 #include "mongo/util/str.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 namespace {
@@ -88,7 +89,6 @@ using CallbackHandle = executor::TaskExecutor::CallbackHandle;
 using CallbackArgs = executor::TaskExecutor::CallbackArgs;
 using RemoteCommandCallbackArgs = executor::TaskExecutor::RemoteCommandCallbackArgs;
 using RemoteCommandCallbackFn = executor::TaskExecutor::RemoteCommandCallbackFn;
-using FeatureCompatibility = ServerGlobalParams::FeatureCompatibility;
 
 const ReadPreferenceSetting kConfigReadSelector(ReadPreference::Nearest, TagSet{});
 
@@ -691,9 +691,9 @@ StatusWith<std::string> ShardingCatalogManager::addShard(
                 !fcvRegion->isUpgradingOrDowngrading());
 
         // (Generic FCV reference): These FCV checks should exist across LTS binary versions.
-        invariant(fcvRegion == FeatureCompatibility::kLatest ||
-                  fcvRegion == FeatureCompatibility::kLastContinuous ||
-                  fcvRegion == FeatureCompatibility::kLastLTS);
+        invariant(fcvRegion == multiversion::GenericFCV::kLatest ||
+                  fcvRegion == multiversion::GenericFCV::kLastContinuous ||
+                  fcvRegion == multiversion::GenericFCV::kLastLTS);
 
         SetFeatureCompatibilityVersion setFcvCmd(fcvRegion->getVersion());
         setFcvCmd.setDbName(NamespaceString::kAdminDb);
diff --git a/src/mongo/db/s/create_collection_coordinator.cpp b/src/mongo/db/s/create_collection_coordinator.cpp
index 5eeb7f09c60..c9c070a4b0f 100644
--- a/src/mongo/db/s/create_collection_coordinator.cpp
+++ b/src/mongo/db/s/create_collection_coordinator.cpp
@@ -768,7 +768,7 @@ void CreateCollectionCoordinator::_commit(OperationContext* opCtx) {
     // TODO: Remove condition once FCV 6.0 becomes last-lts
     const auto& currentFCV = serverGlobalParams.featureCompatibility;
     if (currentFCV.isGreaterThanOrEqualTo(
-            ServerGlobalParams::FeatureCompatibility::Version::kUpgradingFrom50To51)) {
+            multiversion::FeatureCompatibilityVersion::kUpgradingFrom_5_0_To_5_1)) {
         coll.setSupportingLongName(SupportingLongNameStatusEnum::kImplicitlyEnabled);
     }
 
diff --git a/src/mongo/db/s/sharding_ddl_util.cpp b/src/mongo/db/s/sharding_ddl_util.cpp
index 85682a5925c..a5929f36d5e 100644
--- a/src/mongo/db/s/sharding_ddl_util.cpp
+++ b/src/mongo/db/s/sharding_ddl_util.cpp
@@ -313,7 +313,7 @@ void shardedRenameMetadata(OperationContext* opCtx,
         // Only bump the epoch if the whole cluster is in FCV 5.0, so chunks do not contain epochs.
         FixedFCVRegion fixedFCVRegion(opCtx);
         if (serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-                ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo50)) {
+                multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0)) {
             fromCollType.setEpoch(OID::gen());
         }
     }
diff --git a/src/mongo/db/s/sharding_mongod_test_fixture.cpp b/src/mongo/db/s/sharding_mongod_test_fixture.cpp
index 3760b7e0661..f81cda6ba08 100644
--- a/src/mongo/db/s/sharding_mongod_test_fixture.cpp
+++ b/src/mongo/db/s/sharding_mongod_test_fixture.cpp
@@ -134,8 +134,7 @@ ShardingMongodTestFixture::ShardingMongodTestFixture() {
     // Set the highest FCV because otherwise it defaults to the lower FCV. This way we default to
     // testing this release's code, not backwards compatibility code.
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLatest);
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLatest);
 }
 
 ShardingMongodTestFixture::~ShardingMongodTestFixture() = default;
diff --git a/src/mongo/db/server_options.h b/src/mongo/db/server_options.h
index 14a4416f0a8..d00310d7df2 100644
--- a/src/mongo/db/server_options.h
+++ b/src/mongo/db/server_options.h
@@ -36,6 +36,7 @@
 #include "mongo/platform/process_id.h"
 #include "mongo/stdx/variant.h"
 #include "mongo/util/net/cidr.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 
@@ -139,6 +140,8 @@ struct ServerGlobalParams {
     static constexpr bool kIsLTSBinaryVersion = false;
 
     struct FeatureCompatibility {
+        using FCV = multiversion::FeatureCompatibilityVersion;
+
         /**
          * The combination of the fields (version, targetVersion, previousVersion) in the
          * featureCompatibilityVersion document in the server configuration collection
@@ -175,89 +178,50 @@ struct ServerGlobalParams {
          *                        will return the default (kUnsetDefault{LTS}Behavior).
          *
          */
-        enum class Version {
-            // The order of these enums matter: sort by (version, targetVersion, previousVersion).
-            kInvalid,
-            kVersion44,              // To be removed once old feature flags are deleted
-            kVersion47,              // To be removed once old feature flags are deleted
-            kVersion48,              // To be removed once old feature flags are deleted
-            kVersion49,              // To be removed once old feature flags are deleted
-            kFullyDowngradedTo44,    // To be removed once old feature flags are deleted
-            kDowngradingFrom50To49,  // To be removed once old feature flags are deleted
-            kDowngradingFrom50To44,  // To be removed once old feature flags are deleted
-            kUpgradingFrom44To50,    // To be removed once old feature flags are deleted
-            kUpgradingFrom44To47,    // To be removed once old feature flags are deleted
-            kUpgradingFrom49To50,    // To be removed once old feature flags are deleted
-            kUnsetDefault50Behavior,
-            kFullyDowngradedTo50,    // { version: 5.0 }
-            kDowngradingFrom51To50,  // { version: 5.0, targetVersion: 5.0, previousVersion: 5.1 }
-            kUpgradingFrom50To51,    // { version: 5.0, targetVersion: 5.1 }
-            kVersion51,              // { version: 5.1 }
-        };
-
-        // These constants should only be used for generic FCV references. Generic references are
-        // FCV references that are expected to exist across LTS binary versions.
-        static constexpr Version kLatest = Version::kVersion51;
-        static constexpr Version kLastContinuous = Version::kFullyDowngradedTo50;
-        static constexpr Version kLastLTS = Version::kFullyDowngradedTo50;
-
-        // These constants should only be used for generic FCV references. Generic references are
-        // FCV references that are expected to exist across LTS binary versions.
-        // NOTE: DO NOT USE THEM FOR REGULAR FCV CHECKS.
-        static constexpr Version kUpgradingFromLastLTSToLatest = Version::kUpgradingFrom50To51;
-        static constexpr Version kUpgradingFromLastContinuousToLatest =
-            Version::kUpgradingFrom50To51;
-        static constexpr Version kDowngradingFromLatestToLastLTS = Version::kDowngradingFrom51To50;
-        static constexpr Version kDowngradingFromLatestToLastContinuous =
-            Version::kDowngradingFrom51To50;
-        // kUpgradingFromLastLTSToLastContinuous is only ever set to a valid FCV when
-        // kLastLTS and kLastContinuous are not equal. Otherwise, this value should be set to
-        // kInvalid.
-        static constexpr Version kUpgradingFromLastLTSToLastContinuous = Version::kInvalid;
 
         /**
          * On startup, the featureCompatibilityVersion may not have been explicitly set yet. This
          * exposes the actual state of the featureCompatibilityVersion if it is uninitialized.
          */
         const bool isVersionInitialized() const {
-            return _version.load() != Version::kUnsetDefault50Behavior;
+            return _version.load() != FCV::kUnsetDefaultLastLTSBehavior;
         }
 
         /**
          * This safe getter for the featureCompatibilityVersion parameter ensures the parameter has
          * been initialized with a meaningful value.
          */
-        const Version getVersion() const {
+        const FCV getVersion() const {
             invariant(isVersionInitialized());
             return _version.load();
         }
 
-        bool isLessThanOrEqualTo(Version version, Version* versionReturn = nullptr) const {
-            Version currentVersion = getVersion();
+        bool isLessThanOrEqualTo(FCV version, FCV* versionReturn = nullptr) const {
+            auto currentVersion = getVersion();
             if (versionReturn != nullptr) {
                 *versionReturn = currentVersion;
             }
             return currentVersion <= version;
         }
 
-        bool isGreaterThanOrEqualTo(Version version, Version* versionReturn = nullptr) const {
-            Version currentVersion = getVersion();
+        bool isGreaterThanOrEqualTo(FCV version, FCV* versionReturn = nullptr) const {
+            auto currentVersion = getVersion();
             if (versionReturn != nullptr) {
                 *versionReturn = currentVersion;
             }
             return currentVersion >= version;
         }
 
-        bool isLessThan(Version version, Version* versionReturn = nullptr) const {
-            Version currentVersion = getVersion();
+        bool isLessThan(FCV version, FCV* versionReturn = nullptr) const {
+            auto currentVersion = getVersion();
             if (versionReturn != nullptr) {
                 *versionReturn = currentVersion;
             }
             return currentVersion < version;
         }
 
-        bool isGreaterThan(Version version, Version* versionReturn = nullptr) const {
-            Version currentVersion = getVersion();
+        bool isGreaterThan(FCV version, FCV* versionReturn = nullptr) const {
+            auto currentVersion = getVersion();
             if (versionReturn != nullptr) {
                 *versionReturn = currentVersion;
             }
@@ -265,23 +229,27 @@ struct ServerGlobalParams {
         }
 
         // This function is to be used for generic FCV references only, and not for FCV-gating.
-        bool isUpgradingOrDowngrading(boost::optional<Version> version = boost::none) const {
+        bool isUpgradingOrDowngrading(boost::optional<FCV> version = boost::none) const {
             if (version == boost::none) {
                 version = getVersion();
             }
-            return version != kLatest && version != kLastContinuous && version != kLastLTS;
+
+            // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
+            return version != multiversion::GenericFCV::kLatest &&
+                version != multiversion::GenericFCV::kLastContinuous &&
+                version != multiversion::GenericFCV::kLastLTS;
         }
 
         void reset() {
-            _version.store(Version::kUnsetDefault50Behavior);
+            _version.store(FCV::kUnsetDefaultLastLTSBehavior);
         }
 
-        void setVersion(Version version) {
+        void setVersion(FCV version) {
             return _version.store(version);
         }
 
     private:
-        AtomicWord<Version> _version{Version::kUnsetDefault50Behavior};
+        AtomicWord<FCV> _version{FCV::kUnsetDefaultLastLTSBehavior};
 
     } mutableFeatureCompatibility;
 
diff --git a/src/mongo/db/service_entry_point_mongod.cpp b/src/mongo/db/service_entry_point_mongod.cpp
index 8ad042a17fd..8b85198cd32 100644
--- a/src/mongo/db/service_entry_point_mongod.cpp
+++ b/src/mongo/db/service_entry_point_mongod.cpp
@@ -216,7 +216,7 @@ public:
                 // TODO: SERVER-58743: Remove following 'if' block.
                 if (auto& fcv = serverGlobalParams.featureCompatibility;
                     !fcv.isVersionInitialized() ||
-                    fcv.isLessThan(FeatureCompatibilityParams::Version::kVersion51)) {
+                    fcv.isLessThan(multiversion::FeatureCompatibilityVersion::kVersion_5_1)) {
                     // For commands from mongos, append some info to help getLastError(w) work.
                     rpc::ShardingMetadata(lastOpTimeFromClient, replCoord->getElectionId())
                         .writeToMetadata(metadataBob)
diff --git a/src/mongo/db/startup_recovery.cpp b/src/mongo/db/startup_recovery.cpp
index 2e236863068..655af5e36dd 100644
--- a/src/mongo/db/startup_recovery.cpp
+++ b/src/mongo/db/startup_recovery.cpp
@@ -100,7 +100,7 @@ Status restoreMissingFeatureCompatibilityVersionDocument(OperationContext* opCtx
         LOGV2(4926905,
               "Re-creating featureCompatibilityVersion document that was deleted. Creating new "
               "document with last LTS version.",
-              "version"_attr = FeatureCompatibilityVersionParser::kLastLTS);
+              "version"_attr = multiversion::toString(multiversion::GenericFCV::kLastLTS));
         uassertStatusOK(
             createCollection(opCtx, fcvNss.db().toString(), BSON("create" << fcvNss.coll())));
     }
@@ -113,19 +113,17 @@ Status restoreMissingFeatureCompatibilityVersionDocument(OperationContext* opCtx
     BSONObj featureCompatibilityVersion;
     if (!Helpers::findOne(opCtx,
                           fcvColl,
-                          BSON("_id" << FeatureCompatibilityVersionParser::kParameterName),
+                          BSON("_id" << multiversion::kParameterName),
                           featureCompatibilityVersion)) {
         // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
         LOGV2(21000,
               "Re-creating featureCompatibilityVersion document that was deleted. Creating new "
-              "document with version "
-              "{FeatureCompatibilityVersionParser_kLastLTS}.",
-              "Re-creating featureCompatibilityVersion document that was deleted",
-              "version"_attr = FeatureCompatibilityVersionParser::kLastLTS);
+              "document with version ",
+              "version"_attr = multiversion::toString(multiversion::GenericFCV::kLastLTS));
 
         FeatureCompatibilityVersionDocument fcvDoc;
         // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-        fcvDoc.setVersion(ServerGlobalParams::FeatureCompatibility::kLastLTS);
+        fcvDoc.setVersion(multiversion::GenericFCV::kLastLTS);
 
         writeConflictRetry(opCtx, "insertFCVDocument", fcvNss.ns(), [&] {
             WriteUnitOfWork wunit(opCtx);
@@ -136,10 +134,8 @@ Status restoreMissingFeatureCompatibilityVersionDocument(OperationContext* opCtx
         });
     }
 
-    invariant(Helpers::findOne(opCtx,
-                               fcvColl,
-                               BSON("_id" << FeatureCompatibilityVersionParser::kParameterName),
-                               featureCompatibilityVersion));
+    invariant(Helpers::findOne(
+        opCtx, fcvColl, BSON("_id" << multiversion::kParameterName), featureCompatibilityVersion));
 
     return Status::OK();
 }
diff --git a/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp b/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp
index 1ad645908af..449fbc4bb55 100644
--- a/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp
+++ b/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp
@@ -151,7 +151,7 @@ bool WiredTigerFileVersion::shouldDowngrade(bool readOnly,
     }
 
     if (serverGlobalParams.featureCompatibility.isGreaterThan(
-            ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo44)) {
+            multiversion::FeatureCompatibilityVersion::kVersion_4_4)) {
         // Only consider downgrading when FCV is set to kFullyDowngraded.
         // (This FCV gate must remain across binary version releases.)
         return false;
diff --git a/src/mongo/db/update/pipeline_executor.cpp b/src/mongo/db/update/pipeline_executor.cpp
index c2e77fb1e90..ac6df9ca086 100644
--- a/src/mongo/db/update/pipeline_executor.cpp
+++ b/src/mongo/db/update/pipeline_executor.cpp
@@ -104,7 +104,7 @@ UpdateExecutor::ApplyResult PipelineExecutor::applyUpdate(ApplyParams applyParam
     bool allowTopLevelDollarPrefixedFields =
         serverGlobalParams.featureCompatibility.isVersionInitialized() &&
         serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-            FeatureCompatibilityParams::Version::kFullyDowngradedTo50);
+            multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
     auto ret = ObjectReplaceExecutor::applyReplacementUpdate(
         applyParams, transformedDoc, transformedDocHasIdField, allowTopLevelDollarPrefixedFields);
 
diff --git a/src/mongo/db/update/storage_validation.cpp b/src/mongo/db/update/storage_validation.cpp
index 444637470f3..3e04bf45f35 100644
--- a/src/mongo/db/update/storage_validation.cpp
+++ b/src/mongo/db/update/storage_validation.cpp
@@ -115,7 +115,7 @@ void validateDollarPrefixElement(mutablebson::ConstElement elem) {
         const auto replaceWithHint =
             serverGlobalParams.featureCompatibility.isVersionInitialized() &&
                 serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-                    FeatureCompatibilityParams::Version::kFullyDowngradedTo50)
+                    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0)
             ? "' is not allowed in the context of an update's replacement document. Consider using "
               "an aggregation pipeline with $replaceWith."
             : "' is not valid for storage.";
@@ -140,7 +140,7 @@ Status storageValidIdField(const mongo::BSONElement& element) {
             if (!status.isOK() && status.code() == ErrorCodes::DollarPrefixedFieldName &&
                 serverGlobalParams.featureCompatibility.isVersionInitialized() &&
                 serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-                    FeatureCompatibilityParams::Version::kFullyDowngradedTo50)) {
+                    multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0)) {
                 return Status(status.code(),
                               str::stream() << "_id fields may not contain '$'-prefixed fields: "
                                             << status.reason());
@@ -203,7 +203,7 @@ void storageValid(mutablebson::ConstElement elem,
     const bool dotsAndDollarsFeatureEnabled =
         serverGlobalParams.featureCompatibility.isVersionInitialized() &&
         serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-            FeatureCompatibilityParams::Version::kFullyDowngradedTo50);
+            multiversion::FeatureCompatibilityVersion::kFullyDowngradedTo_5_0);
     const bool checkFields = !dotsAndDollarsFeatureEnabled || checkTopLevelFields;
 
     auto fieldName = elem.getFieldName();
diff --git a/src/mongo/db/views/view_catalog.cpp b/src/mongo/db/views/view_catalog.cpp
index 835bcfddc76..e84d0c0fa69 100644
--- a/src/mongo/db/views/view_catalog.cpp
+++ b/src/mongo/db/views/view_catalog.cpp
@@ -455,10 +455,10 @@ StatusWith<stdx::unordered_set<NamespaceString>> ViewCatalog::validatePipeline(
     // primary, ban the use of new agg features introduced in kLatest to prevent them from being
     // persisted in the catalog.
     // (Generic FCV reference): This FCV check should exist across LTS binary versions.
-    ServerGlobalParams::FeatureCompatibility::Version fcv;
+    multiversion::FeatureCompatibilityVersion fcv;
     if (serverGlobalParams.validateFeaturesAsPrimary.load() &&
-        serverGlobalParams.featureCompatibility.isLessThan(
-            ServerGlobalParams::FeatureCompatibility::kLatest, &fcv)) {
+        serverGlobalParams.featureCompatibility.isLessThan(multiversion::GenericFCV::kLatest,
+                                                           &fcv)) {
         expCtx->maxFeatureCompatibilityVersion = fcv;
     }
 
diff --git a/src/mongo/dbtests/dbtests.cpp b/src/mongo/dbtests/dbtests.cpp
index 019544a8b03..c34817f10f4 100644
--- a/src/mongo/dbtests/dbtests.cpp
+++ b/src/mongo/dbtests/dbtests.cpp
@@ -188,8 +188,7 @@ int dbtestsMain(int argc, char** argv) {
 
     mongo::runGlobalInitializersOrDie(std::vector<std::string>(argv, argv + argc));
     // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLatest);
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLatest);
     repl::ReplSettings replSettings;
     replSettings.setOplogSizeBytes(10 * 1024 * 1024);
     setGlobalServiceContext(ServiceContext::make());
diff --git a/src/mongo/idl/basic_types.idl b/src/mongo/idl/basic_types.idl
index c0037bbb446..4a5349ca353 100644
--- a/src/mongo/idl/basic_types.idl
+++ b/src/mongo/idl/basic_types.idl
@@ -222,7 +222,7 @@ types:
         description: >-
             Ensures that the version strings in featureCompatibilityVersion documents
             serialize/deserialize to a fixed set of string values
-        cpp_type: "ServerGlobalParams::FeatureCompatibility::Version"
+        cpp_type: "multiversion::FeatureCompatibilityVersion"
         serializer: "::mongo::FeatureCompatibilityVersionParser::serializeVersion"
         deserializer: "mongo::FeatureCompatibilityVersionParser::parseVersion"
 
diff --git a/src/mongo/idl/feature_flag.cpp b/src/mongo/idl/feature_flag.cpp
index b02d110ec8b..4669bf0466e 100644
--- a/src/mongo/idl/feature_flag.cpp
+++ b/src/mongo/idl/feature_flag.cpp
@@ -30,12 +30,13 @@
 #include "mongo/idl/feature_flag.h"
 #include "mongo/db/commands/feature_compatibility_version_parser.h"
 #include "mongo/util/debug_util.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 
 // (Generic FCV reference): feature flag support
 FeatureFlag::FeatureFlag(bool enabled, StringData versionString)
-    : _enabled(enabled), _version(ServerGlobalParams::FeatureCompatibility::kLatest) {
+    : _enabled(enabled), _version(multiversion::GenericFCV::kLatest) {
 
     // Verify the feature flag invariants. IDL binder verifies these hold but we add these checks to
     // prevent incorrect direct instantiation.
@@ -67,7 +68,7 @@ bool FeatureFlag::isEnabledAndIgnoreFCV() const {
     return _enabled;
 }
 
-ServerGlobalParams::FeatureCompatibility::Version FeatureFlag::getVersion() const {
+multiversion::FeatureCompatibilityVersion FeatureFlag::getVersion() const {
     uassert(5111001, "Feature Flag is not enabled, cannot retrieve version", _enabled);
 
     return _version;
diff --git a/src/mongo/idl/feature_flag.h b/src/mongo/idl/feature_flag.h
index 0a5bf3c6ca0..ea097637606 100644
--- a/src/mongo/idl/feature_flag.h
+++ b/src/mongo/idl/feature_flag.h
@@ -36,6 +36,7 @@
 #include "mongo/db/server_options.h"
 #include "mongo/idl/server_parameter.h"
 #include "mongo/idl/server_parameter_with_storage.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 
@@ -72,14 +73,14 @@ public:
      *
      * Throws if feature is not enabled.
      */
-    ServerGlobalParams::FeatureCompatibility::Version getVersion() const;
+    multiversion::FeatureCompatibilityVersion getVersion() const;
 
 private:
     void set(bool enabled);
 
 private:
     bool _enabled;
-    ServerGlobalParams::FeatureCompatibility::Version _version;
+    multiversion::FeatureCompatibilityVersion _version;
 };
 
 /**
diff --git a/src/mongo/idl/feature_flag_test.cpp b/src/mongo/idl/feature_flag_test.cpp
index 7431a7e9d18..e4a41e48c67 100644
--- a/src/mongo/idl/feature_flag_test.cpp
+++ b/src/mongo/idl/feature_flag_test.cpp
@@ -84,20 +84,19 @@ TEST(IDLFeatureFlag, Basic) {
     ASSERT(feature_flags::gFeatureFlagToaster.isEnabledAndIgnoreFCV() == true);
     ASSERT_NOT_OK(featureFlagToaster->setFromString("alpha"));
 
-    ASSERT(feature_flags::gFeatureFlagToaster.getVersion() ==
-           ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+    // (Generic FCV reference): feature flag test
+    ASSERT(feature_flags::gFeatureFlagToaster.getVersion() == multiversion::GenericFCV::kLatest);
 }
 
 // Verify getVersion works correctly when enabled and not enabled
 TEST_F(FeatureFlagTest, Version) {
-    ASSERT(feature_flags::gFeatureFlagBlender.getVersion() ==
-           ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+    // (Generic FCV reference): feature flag test
+    ASSERT(feature_flags::gFeatureFlagBlender.getVersion() == multiversion::GenericFCV::kLatest);
 
     // NOTE: if you are hitting this assertion, the version in feature_flag_test.idl may need to be
     // changed to match the current kLastLTS
     // (Generic FCV reference): feature flag test
-    ASSERT(feature_flags::gFeatureFlagSpoon.getVersion() ==
-           ServerGlobalParams::FeatureCompatibility::kLastLTS);
+    ASSERT(feature_flags::gFeatureFlagSpoon.getVersion() == multiversion::GenericFCV::kLastLTS);
 
     ASSERT_OK(_featureFlagBlender->setFromString("false"));
     ASSERT(feature_flags::gFeatureFlagBlender.isEnabledAndIgnoreFCV() == false);
@@ -137,8 +136,8 @@ TEST_F(FeatureFlagTest, ServerStatus) {
 TEST_F(FeatureFlagTest, IsEnabledTrue) {
     // Test FCV checks with enabled flag
     // Test newest version
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+    // (Generic FCV reference): feature flag test
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLatest);
 
     ASSERT_TRUE(
         feature_flags::gFeatureFlagBlender.isEnabled(serverGlobalParams.featureCompatibility));
@@ -147,8 +146,7 @@ TEST_F(FeatureFlagTest, IsEnabledTrue) {
 
     // Test oldest version
     // (Generic FCV reference): feature flag test
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLastLTS);
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLastLTS);
 
     ASSERT_FALSE(
         feature_flags::gFeatureFlagBlender.isEnabled(serverGlobalParams.featureCompatibility));
@@ -163,8 +161,8 @@ TEST_F(FeatureFlagTest, IsEnabledFalse) {
     ASSERT_OK(_featureFlagBlender->setFromString("false"));
     ASSERT_OK(_featureFlagSpoon->setFromString("false"));
 
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::Version::kVersion51);
+    // (Generic FCV reference): feature flag test
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLatest);
 
     ASSERT_FALSE(
         feature_flags::gFeatureFlagBlender.isEnabled(serverGlobalParams.featureCompatibility));
@@ -173,8 +171,7 @@ TEST_F(FeatureFlagTest, IsEnabledFalse) {
 
     // Test oldest version
     // (Generic FCV reference): feature flag test
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLastLTS);
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLastLTS);
 
     ASSERT_FALSE(
         feature_flags::gFeatureFlagBlender.isEnabled(serverGlobalParams.featureCompatibility));
diff --git a/src/mongo/idl/idl_parser.h b/src/mongo/idl/idl_parser.h
index df5d788a1b3..a9df8299e3b 100644
--- a/src/mongo/idl/idl_parser.h
+++ b/src/mongo/idl/idl_parser.h
@@ -103,9 +103,8 @@ auto idlPreparsedValue(stdx::type_identity<T>) {
  * TODO(SERVER-50101): Remove 'FeatureCompatibility::Version' once IDL supports
  * a command cpp_type of C++ enum.
  */
-inline auto idlPreparsedValue(
-    stdx::type_identity<ServerGlobalParams::FeatureCompatibility::Version>) {
-    return ServerGlobalParams::FeatureCompatibility::Version::kUnsetDefault50Behavior;
+inline auto idlPreparsedValue(stdx::type_identity<multiversion::FeatureCompatibilityVersion>) {
+    return multiversion::FeatureCompatibilityVersion::kUnsetDefaultLastLTSBehavior;
 }
 
 }  // namespace preparsed_value_adl_barrier
diff --git a/src/mongo/s/client/shard_registry.cpp b/src/mongo/s/client/shard_registry.cpp
index eb7b18671de..302c469afae 100644
--- a/src/mongo/s/client/shard_registry.cpp
+++ b/src/mongo/s/client/shard_registry.cpp
@@ -61,7 +61,7 @@ const Seconds kRefreshPeriod(30);
 bool useActualTopologyTime() {
     return serverGlobalParams.featureCompatibility.isVersionInitialized() &&
         serverGlobalParams.featureCompatibility.isGreaterThanOrEqualTo(
-            ServerGlobalParams::FeatureCompatibility::Version::kVersion47);
+            multiversion::FeatureCompatibilityVersion::kVersion_4_7);
 }
 
 }  // namespace
diff --git a/src/mongo/s/commands/cluster_set_feature_compatibility_version_cmd.cpp b/src/mongo/s/commands/cluster_set_feature_compatibility_version_cmd.cpp
index 800d3aec6a8..d6893ec1083 100644
--- a/src/mongo/s/commands/cluster_set_feature_compatibility_version_cmd.cpp
+++ b/src/mongo/s/commands/cluster_set_feature_compatibility_version_cmd.cpp
@@ -38,6 +38,7 @@
 #include "mongo/s/client/shard_registry.h"
 #include "mongo/s/grid.h"
 #include "mongo/util/str.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo {
 
@@ -57,7 +58,7 @@ class SetFeatureCompatibilityVersionCmd final
     : public TypedCommand<SetFeatureCompatibilityVersionCmd> {
 public:
     using Request = SetFeatureCompatibilityVersion;
-    using FCVP = FeatureCompatibilityVersionParser;
+    using GenericFCV = multiversion::GenericFCV;
 
     AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
         return AllowedOnSecondary::kNever;
@@ -70,15 +71,18 @@ public:
     std::string help() const override {
         std::stringstream h;
         h << "Set the featureCompatibilityVersion used by this cluster. If set to '"
-          << FCVP::kLastLTS << "', then features introduced in versions greater than '"
-          << FCVP::kLastLTS << "' will be disabled";
-        if (FCVP::kLastContinuous != FCVP::kLastLTS) {
-            h << " If set to '" << FCVP::kLastContinuous << "', then features introduced in '"
-              << FCVP::kLatest << "' will be disabled.";
+          << multiversion::toString(GenericFCV::kLastLTS)
+          << "', then features introduced in versions greater than '"
+          << multiversion::toString(GenericFCV::kLastLTS) << "' will be disabled";
+        if (GenericFCV::kLastContinuous != GenericFCV::kLastLTS) {
+            h << " If set to '" << multiversion::toString(GenericFCV::kLastContinuous)
+              << "', then features introduced in '" << multiversion::toString(GenericFCV::kLatest)
+              << "' will be disabled.";
         }
-        h << " If set to '" << FCVP::kLatest << "', then '" << FCVP::kLatest
+        h << " If set to '" << multiversion::toString(GenericFCV::kLatest) << "', then '"
+          << multiversion::toString(GenericFCV::kLatest)
           << "' features are enabled, and all nodes in the cluster must be binary version "
-          << FCVP::kLatest << ". See "
+          << multiversion::toString(GenericFCV::kLatest) << ". See "
           << feature_compatibility_version_documentation::kCompatibilityLink << ".";
         return h.str();
     }
diff --git a/src/mongo/s/mongos_main.cpp b/src/mongo/s/mongos_main.cpp
index 2fe4e84cb1f..0de9e5c87c9 100644
--- a/src/mongo/s/mongos_main.cpp
+++ b/src/mongo/s/mongos_main.cpp
@@ -855,8 +855,7 @@ MONGO_INITIALIZER_WITH_PREREQUISITES(SetFeatureCompatibilityVersionLatest,
                                      ("EndStartupOptionStorage"))
 // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
 (InitializerContext* context) {
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLatest);
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLatest);
 }
 
 #ifdef MONGO_CONFIG_SSL
diff --git a/src/mongo/shell/mongo_main.cpp b/src/mongo/shell/mongo_main.cpp
index b5e5e01a6c7..6d95fca1ec7 100644
--- a/src/mongo/shell/mongo_main.cpp
+++ b/src/mongo/shell/mongo_main.cpp
@@ -119,7 +119,7 @@ MONGO_INITIALIZER_WITH_PREREQUISITES(SetFeatureCompatibilityVersionLatest,
 // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
 (InitializerContext* context) {
     mongo::serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLatest);
+        multiversion::GenericFCV::kLatest);
 }
 
 MONGO_INITIALIZER_WITH_PREREQUISITES(WireSpec, ("EndStartupOptionSetup"))(InitializerContext*) {
diff --git a/src/mongo/unittest/ensure_fcv.h b/src/mongo/unittest/ensure_fcv.h
index a0e6e19ed8d..a1015b946b6 100644
--- a/src/mongo/unittest/ensure_fcv.h
+++ b/src/mongo/unittest/ensure_fcv.h
@@ -40,7 +40,7 @@ namespace unittest {
  */
 class EnsureFCV {
 public:
-    using Version = ServerGlobalParams::FeatureCompatibility::Version;
+    using Version = multiversion::FeatureCompatibilityVersion;
     EnsureFCV(Version version)
         : _origVersion(serverGlobalParams.featureCompatibility.getVersion()) {
         serverGlobalParams.mutableFeatureCompatibility.setVersion(version);
diff --git a/src/mongo/unittest/unittest.cpp b/src/mongo/unittest/unittest.cpp
index 35626c38b20..233bb38f3ed 100644
--- a/src/mongo/unittest/unittest.cpp
+++ b/src/mongo/unittest/unittest.cpp
@@ -59,6 +59,7 @@
 #include "mongo/util/signal_handlers_synchronous.h"
 #include "mongo/util/stacktrace.h"
 #include "mongo/util/timer.h"
+#include "mongo/util/version/releases.h"
 
 namespace mongo::unittest {
 namespace {
@@ -156,8 +157,7 @@ namespace {
 // with a meaningful value will trigger failures as of SERVER-32630.
 // (Generic FCV reference): This FCV reference should exist across LTS binary versions.
 void setUpFCV() {
-    serverGlobalParams.mutableFeatureCompatibility.setVersion(
-        ServerGlobalParams::FeatureCompatibility::kLatest);
+    serverGlobalParams.mutableFeatureCompatibility.setVersion(multiversion::GenericFCV::kLatest);
 }
 void tearDownFCV() {
     serverGlobalParams.mutableFeatureCompatibility.reset();