ztison opened a new pull request, #27257:
URL: https://github.com/apache/flink/pull/27257
## What is the purpose of the change
This PR resolves a race condition that leads to a
`ConcurrentModificationException` when OpenTelemetry (OTel) metrics are
collected simultaneously with updates to the tracked task managers in the
`SlotManager`.
## Brief change log
- The new fields for the metrics are introduced
- These fields are periodically updated on the main thread every 1s
- OpenTelemetry reads these static fields
## Verifying this change
This change added tests and can be verified as follows:
- New test was added that verifies the fields are periodically updated and
values are propagated to the OpenTelemetry collector.
## 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: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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