empiredan commented on code in PR #1258:
URL: 
https://github.com/apache/incubator-pegasus/pull/1258#discussion_r1037066643


##########
src/utils/metrics.cpp:
##########
@@ -81,19 +83,115 @@ metric_entity::metric_map metric_entity::metrics() const
     return _metrics;
 }
 
-void metric_entity::set_attributes(attr_map &&attrs)
+void metric_entity::set_attributes(const attr_map &attrs)
 {
     utils::auto_write_lock l(_lock);
-    _attrs = std::move(attrs);
+    _attrs = attrs;
 }
 
-metric_entity_ptr metric_entity_prototype::instantiate(const std::string &id,
-                                                       metric_entity::attr_map 
attrs) const
+void metric_entity::encode_type(metric_json_writer &writer) const
+{
+    writer.Key(kMetricEntityTypeField.c_str());
+    json::json_encode(writer, _prototype->name());
+}
+
+void metric_entity::encode_id(metric_json_writer &writer) const
+{
+    writer.Key(kMetricEntityIdField.c_str());
+    json::json_encode(writer, _id);
+}
+
+/*static*/ void metric_entity::encode_attrs(metric_json_writer &writer, const 
attr_map &attrs)
+{
+    // Empty attributes are allowed and will just be encoded as {}.

Review Comment:
   This is learned from Kudu metrics. For entity type of `server`, its 
attributes are always empty; it will be returned in json format as `{}`:
   <img width="656" alt="image" 
src="https://user-images.githubusercontent.com/743379/205056320-ea5b0e18-0da4-4957-815f-44ea3f85c335.png";>
   



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