smattheis opened a new pull request #18991:
URL: https://github.com/apache/flink/pull/18991
## What is the purpose of the change
* Add mailbox delay/latency metric backed by a
DescriptiveStatisticsHistogram and throughput metric backed by a MeterView.
## Brief change log
* Added metrics to TaskIOMetricGroup
* Extended StreamTask to schedule mailbox latency measurements using a timer
* Extended MailboxProcessor to count processed mails for throughput
measurement
## Verifying this change
This change added tests and can be verified as follows:
- Extended existing test method
TaskMailboxProcessorTest#testRunDefaultActionAndMails to verify mail/throughput
counting
- Added test method StreamTaskTest#testMailboxMetricsLatency to verify
timer-based latency measurement
## 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, Kubernetes/Yarn, 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)
__Note:__ This PR is based on https://github.com/apache/flink/pull/18984
which is a hotfix.
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