[Core] Add log of address and port (#12908)

Co-authored-by: Allen Yin <allenyin@anyscale.io>

src/ray/rpc/metrics_agent_client.h

@@ -37,6 +37,8 @@ class MetricsAgentClient {
   /// \param[in] client_call_manager The `ClientCallManager` used for managing requests.
   MetricsAgentClient(const std::string &address, const int port,
                      ClientCallManager &client_call_manager) {
+    RAY_LOG(DEBUG) << "Initiate the metrics client of address:" << address
+                   << " port:" << port;
     grpc_client_ = std::unique_ptr<GrpcClient<ReporterService>>(
         new GrpcClient<ReporterService>(address, port, client_call_manager));
   };