Update release notes for v2.12 (#8617) (#8620)

This commit updates the release notes for v2.12 to include a missing experimental feature that adds support for UTF-8 in Alertmanager, released in Mimir v2.12. (cherry picked from commit f61590f) Co-authored-by: George Robinson <[email protected]>
grafana · Jul 4, 2024 · d3536fa · d3536fa
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diff --git a/docs/sources/mimir/release-notes/v2.12.md b/docs/sources/mimir/release-notes/v2.12.md
@@ -168,6 +168,11 @@ Use them with caution and report any issues you encounter:
   These counts are more reactive to ring and shard changes than in-memory series, and can be used when enforcing tenant series limits by enabling the `-ingester.use-ingester-owned-series-for-limits` CLI flag.
   This feature requires [zone-aware replication](https://grafana.com/docs/mimir/latest/configure/configure-zone-aware-replication/) to be enabled, and the replication factor to be equal to the number of zones.
 
+- **Support for UTF-8 in Alertmanager** can be enabled via the `-alertmanager.utf8-strict-mode-enabled` CLI flag.
+  When enabled, Alertmanager can receive alerts with labels containing UTF-8 characters,
+  and match these alerts in routes, inhibition rules, and silences. This feature has backwards-incompatible changes.
+  Follow the instructions [here](https://grafana.com/docs/mimir/v2.12.x/references/architecture/components/alertmanager/#enable-utf8) to enable it.
+
 ## Bug fixes
 
 - Distributor: fixed an issue where `-distributor.metric-relabeling-enabled` could cause distributors to panic.