Add 2.7 release notes (#7661)

**What this PR does / why we need it**:

Adds 2.7 release notes

Co-authored-by: JordanRushing <rushing.jordan@gmail.com>

docs/sources/release-notes/_index.md

@@ -7,6 +7,7 @@ weight: 100
 Release notes for Loki are in the CHANGELOG for the release and
 listed here by version number.
 
+- [V2.7 release notes](../release-notes/v2-7/)
 - [V2.6 release notes](../release-notes/v2-6/)
 - [V2.5 release notes](../release-notes/v2-5/)
 - [V2.4 release notes](../release-notes/v2-4/)

docs/sources/release-notes/v2-7.md

@@ -0,0 +1,34 @@
+---
+title: V2.7
+weight: 66
+---
+
+# Version 2.7 release notes
+
+Grafana Labs is excited to announce the release of Loki 2.7. Here's a summary of new enhancements and important fixes:
+
+## Features and enhancements
+
+- **New Internal Server and TLS** TLS can now be configured everywhere and there is an internal server to allow ring, memberlist, and readiness handlers to continue to work without TLS.
+- **Better Support for Azure Blob Storage** thanks to the ability to use Azure's Service Principal Credentials.
+- **Logs can now be pushed from the Loki canary** so you don't have to rely on a scraping service to use the canary.
+- **Additional `label_format` fields** `__timestamp__` and `__line__`.
+- **New embedded cache** which is an in-process cache system that runs loki without the need for an external cache (like memcached, redis, etc).
+- **New HTTP endpoint for Ingester shutdown** that will also delete the ring token.
+- **Faster label queries** thanks to new parallization.
+- **Introducing Stream Sharding** an experimental new feature to help deal with very large streams.
+- **Promtail**
+  - support for max stream limit
+  - config reload endpoint / signal
+  - compressed file support
+  - `lambda-promtail` now supports Kinesis data stream events
+  - matches for the journal reader
+  - basic tracing support
+
+For a full list of all changes please look at the [CHANGELOG](https://github.com/grafana/loki/blob/main/CHANGELOG.md).
+
+## Upgrade Considerations
+
+As always, please read the [upgrade guide](../../upgrading/#260) before upgrading Loki.
+
+## Bug fixes