Clarify when query-scheduler and query-frontend dashboard panels are …

…expected to show no data (#10624)

* Clarify when query-scheduler and query-frontend panels are expected to show no data

* Add changelog entry

CHANGELOG.md

@@ -70,6 +70,7 @@
 * [ENHANCEMENT] Dashboards: add ingester and store-gateway panels from the 'Reads' dashboard to the 'Remote ruler reads' dashboard as well. #10598
 * [ENHANCEMENT] Dashboards: add ingester and store-gateway panels showing only requests from the respective dashboard's query path to the 'Reads' and 'Remote ruler reads' dashboards. For example, the 'Remote ruler reads' dashboard now has panels showing the ingester query request rate from ruler-queriers. #10598
 * [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
 * [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