xds: Fix log level and message (#8608)

RELEASE NOTES: N/A

Author: arjan-bal

internal/xds/balancer/clusterimpl/clusterimpl.go

@@ -451,7 +451,10 @@ func (b *clusterImplBalancer) NewSubConn(addrs []resolver.Address, opts balancer
 		lID := xdsinternal.GetLocalityID(addr)
 		if (lID == clients.Locality{}) {
 			if b.logger.V(2) {
-				b.logger.Infof("Locality ID for %s unexpectedly empty", addr)
+				// TODO: After A74, we should have the entire CDS config,
+				// allowing us to verify if this is indeed a Logical DNS cluster
+				// and avoid logging the message below.
+				b.logger.Infof("No Locality ID found for address %s. This is normal if %q is a Logical DNS cluster.", addr, clusterName)
 			}
 			return
 		}

internal/xds/clients/xdsclient/ads_stream.go

@@ -458,7 +458,7 @@ func (s *adsStreamImpl) sendMessageLocked(stream clients.Stream, names []string,
 	if s.logger.V(perRPCVerbosityLevel) {
 		s.logger.Infof("ADS request sent: %v", pretty.ToJSON(req))
 	} else if s.logger.V(2) {
-		s.logger.Warningf("ADS request sent for type %q, resources: %v, version: %q, nonce: %q", url, names, version, nonce)
+		s.logger.Infof("ADS request sent for type %q, resources: %v, version: %q, nonce: %q", url, names, version, nonce)
 	}
 
 	return nil