SERVER-127277: Address heartbeat handle leak on DSC (#54079)

Co-authored-by: David Goffredo <david.goffredo@mongodb.com>
GitOrigin-RevId: 8f5432b99c4b23b1f52f4f749db00c72bbb57c09

src/mongo/otel/metrics/metric_unit.cpp

@@ -40,6 +40,8 @@ StringData toString(MetricUnit unit) {
         // Generic
         case MetricUnit::kEvents:
             return "events";
+        case MetricUnit::kCount:
+            return "count";
 
         // Time
         case MetricUnit::kMicroseconds:

src/mongo/otel/metrics/metric_unit.h

@@ -40,6 +40,7 @@ namespace mongo::otel::metrics {
 enum class MetricUnit {
     // Generic
     kEvents,
+    kCount,
 
     // Time
     kMicroseconds,