Merge pull request #12521 from rabbitmq/ra-key-metrics-fix

QQ: improve `rabbit_quorum_queue:status/2` efficiency by allowing it to use `ra:key_metrics/1`

Author: michaelklishin

deps/rabbit/src/rabbit_quorum_queue.erl

@@ -1160,7 +1160,7 @@ cluster_state(Name) ->
 
 key_metrics_rpc(ServerId) ->
     Metrics = ra:key_metrics(ServerId),
-    Metrics#{machine_version := rabbit_fifo:version()}.
+    Metrics#{machine_version => rabbit_fifo:version()}.
 
 -spec status(rabbit_types:vhost(), Name :: rabbit_misc:resource_name()) ->
     [[{binary(), term()}]] | {error, term()}.