SERVER-48742 Log changes to profiler settings

1 files changed, 28 insertions, 2 deletions

diff --git a/src/mongo/db/commands/profile_common.cpp b/src/mongo/db/commands/profile_common.cpp
index bfb095630eb..5b41f6a2fa8 100644
--- a/src/mongo/db/commands/profile_common.cpp
+++ b/src/mongo/db/commands/profile_common.cpp
@@ -26,13 +26,16 @@
  *    exception statement from all source files in the program, then also delete
  *    it in the license file.
  */
+#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kCommand
 
 #include "mongo/platform/basic.h"
 
 #include "mongo/db/auth/authorization_session.h"
 #include "mongo/db/commands/profile_common.h"
 #include "mongo/db/commands/profile_gen.h"
+#include "mongo/db/jsobj.h"
 #include "mongo/idl/idl_parser.h"
+#include "mongo/logv2/log.h"
 
 namespace mongo {
 
@@ -69,10 +72,12 @@ bool ProfileCmdBase::run(OperationContext* opCtx,
     // Delegate to _applyProfilingLevel to set the profiling level appropriately whether we are on
     // mongoD or mongoS.
     int oldLevel = _applyProfilingLevel(opCtx, dbName, profilingLevel);
+    auto oldSlowMS = serverGlobalParams.slowMS;
+    auto oldSampleRate = serverGlobalParams.sampleRate;
 
     result.append("was", oldLevel);
-    result.append("slowms", serverGlobalParams.slowMS);
-    result.append("sampleRate", serverGlobalParams.sampleRate);
+    result.append("slowms", oldSlowMS);
+    result.append("sampleRate", oldSampleRate);
 
     if (auto slowms = request.getSlowms()) {
         serverGlobalParams.slowMS = *slowms;
@@ -84,6 +89,27 @@ bool ProfileCmdBase::run(OperationContext* opCtx,
         serverGlobalParams.sampleRate = *sampleRate;
     }
 
+    // Log the change made to server's profiling settings, unless the request was to get the current
+    // value.
+    if (profilingLevel != -1) {
+        logv2::DynamicAttributes attrs;
+
+        BSONObjBuilder oldState;
+        BSONObjBuilder newState;
+
+        oldState.append("level"_sd, oldLevel);
+        oldState.append("slowms"_sd, oldSlowMS);
+        oldState.append("sampleRate"_sd, oldSampleRate);
+        attrs.add("from", oldState.obj());
+
+        newState.append("level"_sd, profilingLevel);
+        newState.append("slowms"_sd, serverGlobalParams.slowMS);
+        newState.append("sampleRate"_sd, serverGlobalParams.sampleRate);
+        attrs.add("to", newState.obj());
+
+        LOGV2(48742, "Profiler settings changed", attrs);
+    }
+
     return true;
 }
 }  // namespace mongo