gortiz opened a new pull request, #12343:
URL: https://github.com/apache/pinot/pull/12343

   Labels:
   * `bugfix`
   * `observability`
   
   Metric `realtimeIngestionDelayMs` were not deleted on rebalance. For example 
imagina a cluster with two servers where 5 partitions are in server 0 and 5 in 
server 1. After changing the tenants, all partitions are moved to server 0. 
Before this patch nobody notified `RealtimeTableDataManager` about that, so 
`realtimeIngestionDelayMs` increased continuously.
   
   Requesting reviews from @suddendust @zhtaoxiang @jugomezv @Jackie-Jiang 
@klsince, who are the people that recently touched the related classes.


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