zhtaoxiang commented on code in PR #10104:
URL: https://github.com/apache/pinot/pull/10104#discussion_r1068778919


##########
pinot-common/src/main/java/org/apache/pinot/common/metrics/AbstractMetrics.java:
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@@ -707,15 +708,16 @@ public void removeTableGauge(final String tableName, 
final G gauge) {
 
 
   /**
+   * @deprecated please use removeTableGauge(final String tableName, final 
String key, final G gauge) instead
+   *
    * Removes a table gauge given the table name and the gauge.
    * The add/remove is expected to work correctly in case of being invoked 
across multiple threads.
    * @param tableName table name
+   * @param partitionId The partition id
    * @param gauge the gauge to be removed
    */
   public void removePartitionGauge(final String tableName, final int 
partitionId, final G gauge) {

Review Comment:
   Let me break it down into details:
   1. The last parameter of this method is not a `callback` but rather a 
callable, so I'd like to remove `callback` from the method name. `Callback` 
normally means it will tell the caller something.
   2. The guard is actually not needed, `addCallbackGauge` itself will only add 
the gauge once, following calls cannot update it (I tested it and find this 
behavior, that's why I added updatable gauge in another PR 
https://github.com/apache/pinot/pull/9961). I have a plan to remove 
`_gaugeValues` entirely.
   3. Can you please help me understand why we only need to add the gauge for 
the first time? I see only one usage, and it seems that it's okay to update the 
existing gauge.



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