9aman commented on code in PR #16783:
URL: https://github.com/apache/pinot/pull/16783#discussion_r2371581789


##########
pinot-common/src/main/java/org/apache/pinot/common/metrics/ServerGauge.java:
##########
@@ -85,19 +85,19 @@ public enum ServerGauge implements AbstractMetrics.Gauge {
    */
   NETTY_POOLED_THREADLOCALCACHE("bytes", true),
   NETTY_POOLED_CHUNK_SIZE("bytes", true),
-  // Ingestion delay metrics
-  REALTIME_INGESTION_DELAY_MS("milliseconds", false),
-  END_TO_END_REALTIME_INGESTION_DELAY_MS("milliseconds", false),

Review Comment:
   I was being set in the IngestionDelayTracker before. Do we know why this was 
added and what scenarios could it help to debug. 
   
   Referring to 
   
   ```
           if (firstStreamIngestionTimeMs > 0) {
             _serverMetrics.setOrUpdatePartitionGauge(_metricName, partitionId,
                 ServerGauge.END_TO_END_REALTIME_INGESTION_DELAY_MS,
                 () -> getPartitionEndToEndIngestionDelayMs(partitionId));
           }
   ```



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