Add PR number to CHANGELOG

Signed-off-by: Marco Pracucci <marco@pracucci.com>

CHANGELOG.md

@@ -65,7 +65,7 @@
 * [ENHANCEMENT] Ingester: reduce the amount of locks taken during the Head compaction's garbage-collection process, improving the write latency and compaction speed. #8327
 * [ENHANCEMENT] Query-frontend: log the start, end time and matchers for remote read requests to the query stats logs. #8326 #8370 #8373
 * [ENHANCEMENT] Query-frontend: be able to block remote read queries via the per tenant runtime override `blocked_queries`. #8372
-* [ENHANCEMENT] Query-frontend: added `remote_read` to `op` supported label values for the `cortex_query_frontend_queries_total` metric.
+* [ENHANCEMENT] Query-frontend: added `remote_read` to `op` supported label values for the `cortex_query_frontend_queries_total` metric. #8412
 * [BUGFIX] Distributor: prometheus retry on 5xx and 429 errors, while otlp collector only retry on 429, 502, 503 and 504, mapping other 5xx errors to the retryable ones in otlp endpoint. #8324 #8339
 * [BUGFIX] Distributor: make OTLP endpoint return marshalled proto bytes as response body for 4xx/5xx errors. #8227
 * [BUGFIX] Rules: improve error handling when querier is local to the ruler. #7567