suneet-s opened a new pull request, #13760:
URL: https://github.com/apache/druid/pull/13760
### Description
When submitting an ingestion spec, users may pass a map of metadata in the
ingestion spec config that will be added to ingestion metrics.
This will make it possible for operators to tag metrics with other metadata
that doesn't necessarily line up with the existing tags like taskId.
Druid clusters that ingest these metrics can take advantage of the nested
data columns feature to process this additional metadata.
#### Release note
New: You can now add additional metadata to the ingestion metrics emitted
from the Druid cluster.
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.
- [x] a release note entry in the PR description.
- [ ] 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.
- [ ] 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.
- [x] been tested in a test Druid cluster.
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