Add the actual peer in the error message

src/core/lib/surface/call.cc

@@ -1035,9 +1035,15 @@ static void recv_trailing_filter(void* args, grpc_metadata_batch* b,
         grpc_get_status_code_from_metadata(b->idx.named.grpc_status->md);
     grpc_error* error = GRPC_ERROR_NONE;
     if (status_code != GRPC_STATUS_OK) {
-      error = grpc_error_set_int(
+      char* peer_msg = nullptr;
-          GRPC_ERROR_CREATE_FROM_STATIC_STRING("Error received from peer"),
+      char* peer = grpc_call_get_peer(call);
-          GRPC_ERROR_INT_GRPC_STATUS, static_cast<intptr_t>(status_code));
+      gpr_asprintf(&peer_msg, "Error received from peer %s",
+                   grpc_call_get_peer(call));
+      error = grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(peer_msg),
+                                 GRPC_ERROR_INT_GRPC_STATUS,
+                                 static_cast<intptr_t>(status_code));
+      gpr_free(peer);
+      gpr_free(peer_msg);
     }
     if (b->idx.named.grpc_message != nullptr) {
       error = grpc_error_set_str(