updated CHANGELOG.md

Signed-off-by: Miguel Ángel Ortuño <ortuman@gmail.com>

CHANGELOG.md

@@ -28,6 +28,7 @@
 * [FEATURE] Alertmanager: limit added for maximum size of the Grafana state (`-alertmanager.max-grafana-state-size-bytes`). #9475
 * [FEATURE] Alertmanager: limit added for maximum size of the Grafana configuration (`-alertmanager.max-config-size-bytes`). #9402
 * [FEATURE] Ingester: Experimental support for ingesting out-of-order native histograms. This is disabled by default and can be enabled by setting `-ingester.ooo-native-histograms-ingestion-enabled` to `true`. #7175
+* [FEATURE] Distributor: Added `-api.skip-label-count-validation-header-enabled` option to allow skipping label count validation on the HTTP write path based on `X-Mimir-SkipLabelCountValidation` header being `true` or not. #9576
 * [ENHANCEMENT] Ruler: Support `exclude_alerts` parameter in `<prometheus-http-prefix>/api/v1/rules` endpoint. #9300
 * [ENHANCEMENT] Distributor: add a metric to track tenants who are sending newlines in their label values called `cortex_distributor_label_values_with_newlines_total`. #9400
 * [ENHANCEMENT] Ingester: improve performance of reading the WAL. #9508