NealSun96 opened a new issue #1055:
URL: https://github.com/apache/helix/issues/1055


   We are adding 3 endpoints to TaskDriver that return values of 
`SubmissionToProcessDelay`, `SubmissionToScheduleDelay`, and 
`ControllerInducedDelay`. The purpose of the endpoints is to offer an option 
for users that cannot rely directly on the controller emitted metrics to see 
the metric values. In order for the metrics to be accessible from TaskDriver, 
the metric values are written to ZooKeeper every time a new metric value is 
reported. The metric values that are synced to Zk is the mean value. Note: 
since they are synced on reporting time, if there is no reporting, there is no 
update to these values. These endpoint values are fresh when there are task 
framework resources actively running. 


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