add CHANGELOG entry

Signed-off-by: metonymic-smokey <ahuja.aditi@gmail.com>

CHANGELOG.md

@@ -29,6 +29,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#4874](https://github.com/thanos-io/thanos/pull/4874) Query: Add `--endpoint-strict` flag to statically configure Thanos API server endpoints. It is similar to `--store-strict` but supports passing any Thanos gRPC APIs: StoreAPI, MetadataAPI, RulesAPI, TargetsAPI and ExemplarsAPI.
 - [#4868](https://github.com/thanos-io/thanos/pull/4868) Rule: Support ruleGroup limit introduced by Prometheus v2.31.0.
 - [#4897](https://github.com/thanos-io/thanos/pull/4897) Querier: Add validation for querier address flags.
+- [#4903](https://github.com/thanos-io/thanos/pull/4903) Compactor: Added tracing support for compaction.   
 
 ### Fixed