[workspace] UPdate regular not active alert (#17997)

Author: Furisto

operations/observability/mixins/workspace/rules/satellite/workspaces.yaml

@@ -28,9 +28,9 @@ spec:
         summary: too many running but inactive workspaces
         description: too many running but inactive workspaces.
       expr: |
-        gitpod_workspace_regular_not_active_percentage_mk2 > 0.10
+        gitpod_workspace_regular_not_active_percentage_mk2 > 0.08
         AND
-        sum(gitpod_ws_manager_mk2_workspace_activity_total) by(cluster) > 20
+        sum(gitpod_ws_manager_mk2_workspace_activity_total) by(cluster) > 25
 
     - alert: GitpodWorkspacesNotStartingMk2
       labels: