Backport 10481 to release 2.9.x (#10482)

**What this PR does / why we need it**:
#10481 backport final release notes.

**Which issue(s) this PR fixes**:
Fixes #<issue number>

**Special notes for your reviewer**:

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)

Author: kavirajk

docs/sources/release-notes/next.md

@@ -1,14 +1,17 @@
 ---
 title: V?.?
 description: Version ?.? release notes
-weight: 100000
-draft: true
+weight: 55
 ---
 
 # V?.?
-Grafana Labs is excited to announce the release of Loki ?.?. Here's a summary of new enhancements and important fixes:
+Grafana Labs is excited to announce the release of Loki ?.?.? Here's a summary of new enhancements and important fixes:
 
 :warning: This a placeholder for the next release. Clean up all features listed below
 
 ## Features and enhancements
 
+## Upgrade Considerations
+
+## Bug fixes
+>>>>>>> 7d93c3080 (Freeze v2.9.0 release notes on `main` (#10481))

docs/sources/release-notes/v2-9.md

@@ -0,0 +1,31 @@
+---
+title: V2.9
+description: Version 2.9 release notes
+weight: 55
+---
+
+# V2.9
+Grafana Labs is excited to announce the release of Loki 2.9.0 Here's a summary of new enhancements and important fixes:
+
+## Features and enhancements
+
+-  **Query Language Improvements**: Several improvements to the query language that speed up line parsing and regex matching. [PR #8646](https://github.com/grafana/loki/pull/8646), [PR #8659](https://github.com/grafana/loki/pull/8659), [PR #8724](https://github.com/grafana/loki/pull/8724), [PR #8734](https://github.com/grafana/loki/pull/8734), [PR #8739](https://github.com/grafana/loki/pull/8739), [PR #8763](https://github.com/grafana/loki/pull/8763), [PR #8890](https://github.com/grafana/loki/pull/8890), [PR #8914](https://github.com/grafana/loki/pull/8914)
+
+-  **Remote rule evaluation**: Rule evaluation can now be handled by queriers to improve speed. [PR #8744](https://github.com/grafana/loki/pull/8744) [PR #8848](https://github.com/grafana/loki/pull/8848)
+
+-  **Multi-store Index support**: Loki now supports reading/writing indexes to multiple object stores which enables the use of different storage buckets across periods for storing index. [PR #7754](https://github.com/grafana/loki/pull/7754), [PR #7447](https://github.com/grafana/loki/pull/7447)
+
+-  **New volume and volume_range endpoints**: Two new endoints, `index/volume` and `index/volume_range`, have been added to Loki. They return aggregate volume information from the TSDB index for all streams matching a provided stream selector. This feature was introduced via multiple PRs, including [PR #9988](https://github.com/grafana/loki/pull/9988), [PR #9966](https://github.com/grafana/loki/pull/9966), [PR #9833](https://github.com/grafana/loki/pull/9833), [PR #9832](https://github.com/grafana/loki/pull/9832), [PR #9776](https://github.com/grafana/loki/pull/9776), [PR #9762](https://github.com/grafana/loki/pull/9762), [PR #9704](https://github.com/grafana/loki/pull/9704), [PR #10248](https://github.com/grafana/loki/pull/10248), [PR #10099](https://github.com/grafana/loki/pull/10099), [PR #10076](https://github.com/grafana/loki/pull/10076), [PR #10047](https://github.com/grafana/loki/pull/10047) and [PR #10045](https://github.com/grafana/loki/pull/10045)
+
+-  **New Storage Client**: Add support for IBM cloud object storage as storage client. [PR #8826](https://github.com/grafana/loki/pull/8826)
+
+-  **Block queries by hash**: Queries can now be blocked by a query hash. [PR #8953](https://github.com/grafana/loki/pull/8953)
+
+-  **logfmt stage improvements**: logfmt parser now performs non-strict parsing by default which helps scan semi-structured log lines. [PR #9626](https://github.com/grafana/loki/pull/9626)
+
+- **Deprecations**
+  - Legacy index and chunk stores that are not "single store" (such as `tsdb`, `boltdb-shipper`) are deprecated. These storage backends are Cassandra (`cassandra`), DynamoDB (`aws`, `aws-dynamo`), BigTable (`bigtable`, `bigtable-hashed`), GCP (`gcp`, `gcp-columnkey`), and gRPC (`grpc`). See https://grafana.com/docs/loki/latest/storage/ for more information.
+  - The `table-manager` target is deprecated, because it is not used by "single store" implementations.
+  - The `-boltdb.shipper.compactor.*` CLI flags are deprecated in favor of `-compactor.*`.
+  - The `-ingester.unordered-writes` CLI flag is deprecated and will always default to `true` in the next major release.
+  - For the full list of deprecations, see CHANGELOG.md