[FLINK-29195] Expose lastCompletedCheckpointId metric

[chenyuzhi459]

What is the purpose of the change

Expose the lastCheckpointId metric.

Brief change log

• Register LatestCompletedCheckpointIdGauge named "lastCheckpointId" to CheckpointStatsTracker

Verifying this change

This change is already covered by existing tests, such as CheckpointStatsTrackerTest.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (yes)
• If yes, how is the feature documented? (docs)

[flinkbot]

CI report:

• addb6fa7250f8a833957146a60bd5a4fd2a6590f Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[chenyuzhi459]

@flinkbot run azure

[chenyuzhi459]

@flinkbot run azure

[masteryhx]

LGTM, @curcur Do you have other comments ?

[curcur]

Please also update the title and description correspondingly.

[chenyuzhi459]

@flinkbot run azure

[chenyuzhi459]

@flinkbot run azure

[curcur]

I do not have other comments, please update the commit msg, and I will merge the code.

[chenyuzhi459]

@flinkbot run azure

[chenyuzhi459]

The commit-msg needs to be changed to

[FLINK-29195][runtime/Checkpoint] Expose lastCompletedCheckpointId metric

@curcur ok, I have fixed it.

[curcur]

Thanks for fixing up this @chenyuzhi459