Demogorgon314 opened a new pull request, #25132:
URL: https://github.com/apache/pulsar/pull/25132
### Motivation
Long periods of metadata state: Unstable prevent ownership
monitoring/cleanup, which can leave orphan service units and stale bundle
ownership and trigger massive not served by this instance / Please redo the
lookup spam.
The last metadata session event state is updated by one thread and read by
another without a visibility guarantee, which can keep the broker stuck in an
incorrect “Unstable” view and makes incident debugging difficult.
### Modifications
- Mark lastMetadataSessionEvent and lastMetadataSessionEventTimestamp as
volatile to guarantee cross-thread visibility.
- Enrich the “Skipping ownership monitor” warning with the last session
event and timestamp.
- Export new metrics for metadata state and last session event
timestamp/age.
- Add tests to assert the new metrics report expected values.
### Documentation
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- [ ] `doc` <!-- Your PR contains doc changes. -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
later -->
- [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
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