suneet-s opened a new pull request, #13699:
URL: https://github.com/apache/druid/pull/13699
### Description
Add a new API to return the history of changes to automatic compaction
config history to make it easy for users to see what changes have been made to
their auto-compaction config.
The API is scoped per dataSource to allow users to triage issues with an
individual dataSource. The API responds with a list of configs when there is a
change to either the settings that impact all auto-compaction configs on a
cluster or the dataSource in question.
I had considered adding another API to expose the entire compaction config
history as it was stored in the audit table, however I chose against doing
this, as I didn't think users would want the ability to see this global view.
#### Release note
New: You can now get the history of changes to automatic compaction config
for a dataSource via an API.
<hr>
##### Key changed/added classes in this PR
* `DataSourceCompactionConfigHistory#add` - Ensures that only changes that
affect a particular dataSource's auto-compaction config are added to the history
* `CoordinatorCompactionConfigsResource#getCompactionConfigHistory` - the
API endpoint
<hr>
This PR has:
- [ ] been self-reviewed.
- [x] added documentation for new or modified features or behaviors.
- [x] a release note entry in the PR description.
- [x] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [x] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [x] 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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