YARN-11782. [Federation] Fix incorrect error messages and improve failure handling. (#7449)

Co-authored-by: Ayush Saxena <ayushsaxena@apache.org>
Co-authored-by: Chris Nauroth <cnauroth@apache.org>
Co-authored-by: Hualong Zhang <hualong.z@hotmail.com>
Reviewed-by: Ayush Saxena <ayushsaxena@apache.org>
Reviewed-by: Chris Nauroth <cnauroth@apache.org>
Reviewed-by: Hualong Zhang <hualong.z@hotmail.com>
Signed-off-by: Shilun Fan <slfan1989@apache.org>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/clientrm/FederationClientInterceptor.java

@@ -816,7 +816,7 @@ public class FederationClientInterceptor
       GetClusterMetricsRequest request) throws YarnException, IOException {
     if (request == null) {
       routerMetrics.incrGetClusterMetricsFailedRetrieved();
-      String msg = "Missing getApplications request.";
+      String msg = "Missing getClusterMetrics request.";
       RouterAuditLogger.logFailure(user.getShortUserName(), GET_CLUSTERMETRICS, UNKNOWN,
           TARGET_CLIENT_RM_SERVICE, msg);
       RouterServerUtil.logAndThrowException(msg, null);
@@ -1386,7 +1386,7 @@ public class FederationClientInterceptor
       GetLabelsToNodesRequest request) throws YarnException, IOException {
     if (request == null) {
       routerMetrics.incrLabelsToNodesFailedRetrieved();
-      String msg = "Missing getNodesToLabels request.";
+      String msg = "Missing getLabelsToNodes request.";
       RouterAuditLogger.logFailure(user.getShortUserName(), GET_LABELSTONODES, UNKNOWN,
           TARGET_CLIENT_RM_SERVICE, msg);
       RouterServerUtil.logAndThrowException(msg, null);