pnowojski opened a new pull request #10931: [FLINK-15603][metrics] Add checkpointStartDelay metric URL: https://github.com/apache/flink/pull/10931 Introduce a `checkpointStartDelay` metric: the time in nanoseconds that elapsed between the creation of the last checkpoint and the time when the checkpointing process has started by this Task. This delay shows how long it takes for a first checkpoint barrier to reach the task. Back-pressure will increase this value. ## Verifying this change This change is hard to test, however I've added some rudimentary checks in `CheckpointBarrierAlignerTestBase` ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (**yes** / no) - If yes, how is the feature documented? (not applicable / **docs** / JavaDocs / not documented)
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