Put System Metrics group first in default dashboard

changelogs/unreleased/206899-move-system-metrics-chart-group-to-the-top-of-the-default-dashbord.yml

+---
+title: Put System Metrics chart group first in default dashboard
+merge_request: 26355
+author: Andrei Stoicescu
+type: other

config/prometheus/common_metrics.yml

@@ -151,7 +151,7 @@ panel_groups:
       label: HTTP Errors
       unit: "errors / sec"
 - group: System metrics (Kubernetes)
-  priority: 5
+  priority: 15
   panels:
   - title: "Memory Usage (Total)"
     type: "area-chart"