Add CHANGELOG.md entry

Signed-off-by: Dimitar Dimitrov <[email protected]>

CHANGELOG.md

@@ -84,6 +84,7 @@
 * [ENHANCEMENT] Dashboards: 'Writes' dashboard: show write requests broken down by request type. #10599
 * [ENHANCEMENT] Dashboards: clarify when query-frontend and query-scheduler dashboard panels are expected to show no data. #10624
 * [ENHANCEMENT] Alerts: Add warning alert `DistributorGcUsesTooMuchCpu`. #10641
+* [ENHANCEMENT] Dashboards: Add "Federation-frontend" dashboard for GEM. #10697
 * [BUGFIX] Dashboards: fix how we switch between classic and native histograms. #10018
 * [BUGFIX] Alerts: Ignore cache errors performing `delete` operations since these are expected to fail when keys don't exist. #10287
 * [BUGFIX] Dashboards: fix "Mimir / Rollout Progress" latency comparison when gateway is enabled. #10495