kfaraz opened a new pull request, #19687:
URL: https://github.com/apache/druid/pull/19687
### Description
Tuning the lag-based auto-scaler can sometimes be a little involved.
This patch aims to allow making the process simpler by simulating the
optimal task count chosen by the auto-scaler under different conditions.
### Changes currently in this PR
- UI code is generated by Claude and may contain mistakes
- Add a simulate API currently supported for Kafka supervisors only
- This API creates a `CostBasedAutoScaler` in "simulate" mode and generates
the optimal task count for various input values of lag (based on criticalLag)
- Add a UI panel in the supervisor dialog which shows up only for "kafka"
supervisors
- Add a single plot between task count vs lag
### Other required changes
- Use a POST API instead of GET so that the current `autoscalerConfig` may
be sent as payload
- Wire up the UI side so that changes made in the simulate window are
reflected in the `autoscalerConfig` and vice versa
- Fix up the `taskIdleRatio` field to accept decimal numbers, currently the
field resets to integers
- Maybe more plots that help the user make a more informed decision
- Perhaps a plot with the task idleness as well
<hr>
This PR has:
- [ ] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] a release note entry in the PR description.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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