codelipenghui opened a new pull request, #24518:
URL: https://github.com/apache/pulsar/pull/24518
### Motivation
The mark delete position may point to ledgers that have been cleaned
up/deleted. This causes:
1. pulsar_storage_backlog_age_seconds metric returns -1 instead of actual
backlog age after topic unloading
2. Prometheus monitoring shows incorrect backlog age for lagged
subscriptions
You can use the newly added test to reproduce the issue.
### Verifying this change
Added new test
### Does this pull request potentially affect one of the following parts:
<!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
*If the box was checked, please highlight the changes*
- [ ] Dependencies (add or upgrade a dependency)
- [ ] The public API
- [ ] The schema
- [ ] The default values of configurations
- [ ] The threading model
- [ ] The binary protocol
- [ ] The REST endpoints
- [ ] The admin CLI options
- [ ] The metrics
- [ ] Anything that affects deployment
### Documentation
<!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
- [ ] `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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