navina commented on code in PR #10121:
URL: https://github.com/apache/pinot/pull/10121#discussion_r1083142872


##########
pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/IngestionDelayTracker.java:
##########
@@ -196,21 +202,28 @@ void setClock(Clock clock) {
    * Called by LLRealTimeSegmentDataManagers to post ingestion time updates to 
this tracker class.
    *
    * @param ingestionTimeMs ingestion time being recorded.
+   * @param creationTimeMs event creation time.
    * @param partitionGroupId partition ID for which this ingestion time is 
being recorded.
    */
-  public void updateIngestionDelay(long ingestionTimeMs, int partitionGroupId) 
{
+  public void updateIngestionDelay(long ingestionTimeMs, long creationTimeMs, 
int partitionGroupId) {
     // Store new measure and wipe old one for this partition
-    // TODO: see if we can install gauges after the server is ready.
     if (!_isServerReadyToServeQueries.get()) {
       // Do not update the ingestion delay metrics during server startup period
       return;
     }
-    Long previousMeasure = _partitionToIngestionTimeMsMap.put(partitionGroupId,
-        ingestionTimeMs);
+    IngestionTimestamps previousMeasure = 
_partitionToIngestionTimestampsMap.put(partitionGroupId,
+        new IngestionTimestamps(ingestionTimeMs, creationTimeMs));
     if (previousMeasure == null) {
       // First time we start tracking a partition we should start tracking it 
via metric
       _serverMetrics.setOrUpdatePartitionGauge(_metricName, partitionGroupId,
           ServerGauge.REALTIME_INGESTION_DELAY_MS, () -> 
getPartitionIngestionDelayMs(partitionGroupId));
+      if (creationTimeMs != Long.MIN_VALUE) {

Review Comment:
   Yes it is more work :) but I don't think you would ideal state reads 
overhead. other seem more minor reasoning to me. 
   
   Anyway, I want to make sure that there is clear guidance on anyone trying to 
add a connector to a new source. If the guidance ensures that this field can be 
set optionally in the metadata and its usage, then it is fine with me. 
   



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