magnuma3 opened a new pull request, #8520:
URL: https://github.com/apache/hadoop/pull/8520
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### Description of PR
HADOOP-19905
HttpServer2Metrics (HADOOP-17133) exposes only StatisticsHandler
counters. It says nothing about the Jetty thread pool, so
administrators have no metric-level visibility into thread pool
saturation.
This patch adds gauges to HttpServer2Metrics:
* Pool: maxThreads, minThreads, threads, idleThreads, busyThreads, queueSize
* Per role (summed over connectors): acceptorThreads, selectorThreads
* Worker only (pool count minus acceptors and selectors):
maxWorkerThreads, workerThreads, busyWorkerThreads
The worker-only gauges are exposed separately because acceptor and
selector threads sit in blocking accept()/select() loops and never go
idle
### How was this patch tested?
unit test and it has been running in production for over a year.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
### AI Tooling
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