SERVER-41192 Add a logical session cache metric for the size of the SessionCatalog

1 files changed, 7 insertions, 1 deletions

diff --git a/src/mongo/db/commands/logical_session_server_status_section.cpp b/src/mongo/db/commands/logical_session_server_status_section.cpp
index b23605a5506..d39c8332e6b 100644
--- a/src/mongo/db/commands/logical_session_server_status_section.cpp
+++ b/src/mongo/db/commands/logical_session_server_status_section.cpp
@@ -33,6 +33,7 @@
 #include "mongo/db/jsobj.h"
 #include "mongo/db/logical_session_cache.h"
 #include "mongo/db/operation_context.h"
+#include "mongo/db/session_catalog.h"
 
 namespace mongo {
 namespace {
@@ -48,8 +49,13 @@ public:
     BSONObj generateSection(OperationContext* opCtx,
                             const BSONElement& configElement) const override {
         const auto logicalSessionCache = LogicalSessionCache::get(opCtx);
+        const auto sessionCatalog = SessionCatalog::get(opCtx);
 
-        return logicalSessionCache ? logicalSessionCache->getStats().toBSON() : BSONObj();
+        BSONObjBuilder statsBuilder(logicalSessionCache ? logicalSessionCache->getStats().toBSON()
+                                                        : BSONObj());
+        statsBuilder.append("sessionCatalogSize", int32_t(sessionCatalog->size()));
+
+        return statsBuilder.obj();
     }
 
 } logicalSessionsServerStatusSection;