1 files changed, 6 insertions, 0 deletions
diff --git a/src/mongo/db/repl/replication_info.cpp b/src/mongo/db/repl/replication_info.cpp
index dc94c010f41..f35799db885 100644
--- a/src/mongo/db/repl/replication_info.cpp
+++ b/src/mongo/db/repl/replication_info.cpp
@@ -73,6 +73,8 @@ MONGO_FAIL_POINT_DEFINE(waitInHello);
 // standalones. This failpoint will hang right before doing this sleep when set.
 MONGO_FAIL_POINT_DEFINE(hangWaitingForHelloResponseOnStandalone);
 
+MONGO_FAIL_POINT_DEFINE(appendHelloOkToHelloResponse);
+
 using std::list;
 using std::string;
 using std::stringstream;
@@ -418,6 +420,10 @@ public:
             uassertStatusOK(status);
         }
 
+        if (MONGO_unlikely(appendHelloOkToHelloResponse.shouldFail())) {
+            result.append("clientSupportsHello", client->supportsHello());
+        }
+
         auto currentTopologyVersion = appendReplicationInfo(
             opCtx, &result, 0, useLegacyResponseFields(), clientTopologyVersion, maxAwaitTimeMS);