empiredan commented on code in PR #1827:
URL: 
https://github.com/apache/incubator-pegasus/pull/1827#discussion_r1441522448


##########
src/utils/metrics.cpp:
##########
@@ -449,6 +444,89 @@ metric_entity_ptr 
metric_registry::find_or_create_entity(const metric_entity_pro
     return entity;
 }
 
+DSN_DECLARE_string(cluster_name);
+
+namespace {
+
+#define ENCODE_UNKNOWN_IF(expr)                                                
                    \
+    do {                                                                       
                    \
+        if (dsn_unlikely(expr)) {                                              
                    \
+            dsn::json::json_encode(writer, "unknown");                         
                    \
+            return;                                                            
                    \
+        }                                                                      
                    \
+    } while (0)
+
+void encode_cluster(dsn::metric_json_writer &writer)
+{
+    writer.Key(dsn::kMetricClusterField.c_str());
+
+    ENCODE_UNKNOWN_IF(utils::is_empty(dsn::FLAGS_cluster_name));
+
+    dsn::json::json_encode(writer, dsn::FLAGS_cluster_name);

Review Comment:
   OK.



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