Update changelog for release 2.17.0-rc.2 (#12387)

#### What this PR does

Update changelog for release 2.17.0-rc.2

#### Which issue(s) this PR fixes or relates to

Part of #12039

#### Checklist

- [ ] Tests updated.
- [ ] Documentation added.
- [x] `CHANGELOG.md` updated - the order of entries should be
`[CHANGE]`, `[FEATURE]`, `[ENHANCEMENT]`, `[BUGFIX]`. If changelog entry
is not needed, please add the `changelog-not-needed` label to the PR.
- [ ]
[`about-versioning.md`](https://github.com/grafana/mimir/blob/main/docs/sources/mimir/configure/about-versioning.md)
updated with experimental features.

Author: zenador

CHANGELOG.md

@@ -19,8 +19,6 @@
 * [FEATURE] Distributor: Add experimental `-distributor.otel-translation-strategy` flag to support configuring the metric and label name translation strategy in the OTLP endpoint. #12284 #12306 #12369
 * [ENHANCEMENT] Query-frontend: CLI flag `-query-frontend.enabled-promql-experimental-functions` and its associated YAML configuration is now stable. #12368
 * [ENHANCEMENT] Query-scheduler/query-frontend: Add native histogram definitions to `cortex_query_{scheduler|frontend}_queue_duration_seconds`. #12288
-* [ENHANCEMENT] Compactor: Add `-compactor.update-blocks-concurrency` flag to control concurrency for updating block metadata during bucket index updates, separate from deletion marker concurrency. #12117
-* [ENHANCEMENT] Stagger head compaction intervals across zones to prevent compactions from aligning simultaneously, which could otherwise cause strong consistency queries to fail when experimental ingest storage is enabled. #12090
 * [ENHANCEMENT] Querier: Add native histogram definition to `cortex_bucket_index_load_duration_seconds`. #12094
 * [ENHANCEMENT] MQE: Add support for applying common subexpression elimination to range vector expressions in instant queries. #12236
 * [ENHANCEMENT] Ingester: Improve the performance of active series custom trackers matchers. #12184
@@ -38,8 +36,18 @@
 
 ### Documentation
 
-* [BUGFIX] Add a missing attribute to the list of default promoted OTel resource attributes in the docs: deployment.environment. #12181
 * [ENHANCEMENT] Improve the MimirIngesterReachingSeriesLimit runbook. #12356
+* [BUGFIX] Add a missing attribute to the list of default promoted OTel resource attributes in the docs: deployment.environment. #12181
+
+## 2.17.0-rc.2
+
+### Grafana Mimir
+
+* [ENHANCEMENT] Stagger head compaction intervals across zones to prevent compactions from aligning simultaneously, which could otherwise cause strong consistency queries to fail when experimental ingest storage is enabled. #12090
+* [ENHANCEMENT] Compactor: Add `-compactor.update-blocks-concurrency` flag to control concurrency for updating block metadata during bucket index updates, separate from deletion marker concurrency. #12117
+* [ENHANCEMENT] Query-frontend: Allow users to set the `query-frontend.extra-propagated-headers` flag to specify the extra headers allowed to pass through to the rest of the query path. #12174
+* [BUGFIX] Ingester: Fix issue where ingesters can exit read-only mode during idle compactions, resulting in write errors. #12128
+* [BUGFIX] otlp: Reverts #11889 which has a pooled memory re-use bug. #12266
 
 ## 2.17.0-rc.1
 
@@ -56,13 +64,11 @@
 * [ENHANCEMENT] Query-frontend: Added labels query optimizer that automatically removes redundant `__name__!=""` matchers from label names and label values queries, improving query performance. You can enable the optimizer per-tenant with the `labels_query_optimizer_enabled` runtime configuration flag. #12054 #12066 #12076 #12080
 * [ENHANCEMENT] Query-frontend: Standardise non-regex patterns in query blocking upon loading of config. #12102
 * [ENHANCEMENT] Ruler: Propagate GCS object mutation rate limit for rule group uploads. #12086
-* [ENHANCEMENT] Query-frontend: Allow users to set the `query-frontend.extra-propagated-headers` flag to specify the extra headers allowed to pass through to the rest of the query path. #12174
 * [BUGFIX] Distributor: Validate the RW2 symbols field and reject invalid requests that don't have an empty string as the first symbol. #11953
 * [BUGFIX] Distributor: Check `max_inflight_push_requests_bytes` before decompressing incoming requests. #11967
 * [BUGFIX] Query-frontend: Allow limit parameter to be 0 in label queries to explicitly request unlimited results. #12054
 * [BUGFIX] Distributor: Fix a possible panic in the OTLP push path while handling a gRPC status error. #12072
 * [BUGFIX] Query-frontend: Evaluate experimental duration expressions before sharding, splitting, and caching. Otherwise, the result is not correct. #12038
-* [BUGFIX] Ingester: Fix issue where ingesters can exit read-only mode during idle compactions, resulting in write errors. #12128
 * [BUGFIX] Block-builder-scheduler: Fix bugs in handling of partitions with no commit. #12130
 
 ### Mixin