Hi All!

I am running Flink 1.13.1 and I have unaligned checkpoints disabled,
however I often see my checkpoints contain "Processed (persisted) in-flight
data". According to the Flink documentation, it states:

   - *Persisted in-flight data: The number of bytes persisted during the
   alignment (time between receiving the first and the last checkpoint
   barrier) over all acknowledged subtasks. This is > 0 only if the unaligned
   checkpoints are enabled.*

I'm happy to share screenshots of my Checkpoint configuration and history
tabs if needed. Colleagues of mine running 1.14.X have also observed the
same behavior. Is it possible there is some configuration I could be
missing? I have not explicitly disabled unaligned checkpoints but perhaps I
should? I wonder if there might be some kind of bug where the UI is showing
unaligned checkpoints, but the behaviour is not honoring that config.

Thanks!

Darin

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