empiredan commented on code in PR #1237:
URL: 
https://github.com/apache/incubator-pegasus/pull/1237#discussion_r1020078147


##########
src/utils/metrics.h:
##########
@@ -131,6 +132,61 @@
 
 namespace dsn {
 
+using metric_fields_type = std::unordered_set<std::string>;
+
+// This struct includes a set of filters for both entities and metrics 
requested by client.
+struct metric_filters
+{
+    using fields_filter_fn = std::function<bool(const std::string &)>;
+
+    // According to the parameters requested by client, this function will 
filter metric
+    // fields that will be put in the response. `with_metric_fields` includes 
all the metric
+    // fields that are wanted by client; on the contrary, once client wants 
all except some
+    // metric fields, it could specify them in `without_metric_fields`.

Review Comment:
   > Since there are dozens of metrics, what's the use case of specify 
'without_metric_fields'?
   
   For example, `without_metric_fields` will be useful while we request for all 
fields except `desc`.



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