SERVER-48519 Include mirrored read metrics in ftdc

3 files changed, 8 insertions, 2 deletions

diff --git a/src/mongo/db/ftdc/ftdc_server.cpp b/src/mongo/db/ftdc/ftdc_server.cpp
index fa215af1dce..f4fcf1e0ec2 100644
--- a/src/mongo/db/ftdc/ftdc_server.cpp
+++ b/src/mongo/db/ftdc/ftdc_server.cpp
@@ -44,6 +44,7 @@
 #include "mongo/db/ftdc/ftdc_server_gen.h"
 #include "mongo/db/ftdc/ftdc_system_stats.h"
 #include "mongo/db/jsobj.h"
+#include "mongo/db/mirror_maestro.h"
 #include "mongo/db/service_context.h"
 #include "mongo/util/synchronized_value.h"
 
@@ -207,6 +208,8 @@ public:
         // of active migrations.
         // "timing" is filtered out because it triggers frequent schema changes.
         // "defaultRWConcern" is excluded because it changes rarely and instead included in rotation
+        // "mirroredReads" is included to append the number of mirror-able operations observed and
+        // mirrored by this process in FTDC collections.
 
         BSONObjBuilder commandBuilder;
         commandBuilder.append(kCommand, 1);
@@ -214,6 +217,7 @@ public:
         commandBuilder.append("sharding", false);
         commandBuilder.append("timing", false);
         commandBuilder.append("defaultRWConcern", false);
+        commandBuilder.append(MirrorMaestro::kServerStatusSectionName, true);
 
         if (gDiagnosticDataCollectionEnableLatencyHistograms.load()) {
             BSONObjBuilder subObjBuilder(commandBuilder.subobjStart("opLatencies"));
diff --git a/src/mongo/db/mirror_maestro.cpp b/src/mongo/db/mirror_maestro.cpp
index 2ff127dea55..f694fc179ab 100644
--- a/src/mongo/db/mirror_maestro.cpp
+++ b/src/mongo/db/mirror_maestro.cpp
@@ -68,7 +68,6 @@ constexpr auto kMirrorMaestroConnPoolMaxSize = 4ull;       // Never use more tha
 
 constexpr auto kMirroredReadsParamName = "mirrorReads"_sd;
 
-constexpr auto kMirroredReadsName = "mirroredReads"_sd;
 constexpr auto kMirroredReadsSeenKey = "seen"_sd;
 constexpr auto kMirroredReadsSentKey = "sent"_sd;
 constexpr auto kMirroredReadsResolvedKey = "resolved"_sd;
@@ -170,7 +169,8 @@ class MirroredReadsSection final : public ServerStatusSection {
 public:
     using CounterT = long long;
 
-    MirroredReadsSection() : ServerStatusSection(kMirroredReadsName.toString()) {}
+    MirroredReadsSection()
+        : ServerStatusSection(MirrorMaestro::kServerStatusSectionName.toString()) {}
 
     bool includeByDefault() const override {
         return false;
diff --git a/src/mongo/db/mirror_maestro.h b/src/mongo/db/mirror_maestro.h
index f595fd0bcc9..8d22586bfdd 100644
--- a/src/mongo/db/mirror_maestro.h
+++ b/src/mongo/db/mirror_maestro.h
@@ -71,6 +71,8 @@ public:
      * This function will noop if the MirrorMaestro is currently being initialized or shutdown.
      */
     static void tryMirrorRequest(OperationContext* opCtx) noexcept;
+
+    static constexpr auto kServerStatusSectionName = "mirroredReads"_sd;
 };
 
 }  // namespace mongo