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  1. Flink
  2. FLINK-15603

Show checkpoint start delay in checkpoint statistics

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      One of the most important metrics is missing in the checkpoint stats: "start delay" (aka "barrier lag"), meaning the time it between when the checkpoint was triggered and when the barriers arrive at a task.

      That time is critical to identify if a checkpoint takes too long because of backpressure or other contention.

      You can implicitly calculate this by "end_to_end_time - sync_time - async_time", but it is much more obvious for users that something is up when this number is explicitly shown.

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            pnowojski Piotr Nowojski
            sewen Stephan Ewen
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