hangc0276 opened a new pull request, #21006:
URL: https://github.com/apache/pulsar/pull/21006
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<!-- Either this PR fixes an issue, -->
Fixes #xyz
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### Motivation
<!-- Explain here the context, and why you're making that change. What is
the problem you're trying to solve. -->
Exposing topic-level metrics costs a lot of CPU and memory for brokers and
put heavy traffic pressure on Prometheus to pull metrics, especially when the
Pulsar cluster has thousands of topics. To address this issue, we can disable
the topic-level metrics by default and enable it when some topics encountered
any issues.
However, the `exposeTopicLevelMetricsInPrometheus` flag is not dynamic and
we need to change the broker configuration and restart all the brokers to
enable or disable the flag.
We can make the `exposeTopicLevelMetricsInPrometheus` flag dynamic to avoid
restarting all the brokers when enabling or disabling the flag
### Modifications
Make the following flags dynamic
- exposeTopicLevelMetricsInPrometheus
- exposeConsumerLevelMetricsInPrometheus
- exposeProducerLevelMetricsInPrometheus
- exposeManagedLedgerMetricsInPrometheus
- exposeManagedCursorMetricsInPrometheus
- exposePreciseBacklogInPrometheus
- exposeSubscriptionBacklogSizeInPrometheus
<!-- Describe the modifications you've done. -->
### Verifying this change
- [ ] Make sure that the change passes the CI checks.
*(Please pick either of the following options)*
This change is a trivial rework / code cleanup without any test coverage.
*(or)*
This change is already covered by existing tests, such as *(please describe
tests)*.
*(or)*
This change added tests and can be verified as follows:
*(example:)*
- *Added integration tests for end-to-end deployment with large payloads
(10MB)*
- *Extended integration test for recovery after broker failure*
### Does this pull request potentially affect one of the following parts:
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*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
- [x] The metrics
- [ ] Anything that affects deployment
### Documentation
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- [ ] `doc-complete` <!-- Docs have been already added -->
### Matching PR in forked repository
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