fix prometheus rule for workspaces

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

@@ -27,7 +27,7 @@ spec:
       annotations:
         runbook_url: https://github.com/gitpod-io/runbooks/blob/main/runbooks/GitpodWorkspaceStuckOnStarting.md
         summary: 5 or more workspaces are stuck on starting
-        description: "{{ printf '%.2f' $value }} regular workspaces are stuck on starting for more than 20 minutes. Current status: {{ $labels.reason }}"
+        description: '{{ printf "%.2f" $value }} regular workspaces are stuck on starting for more than 20 minutes. Current status: {{ $labels.reason }}'
       expr: |
         count(
           kube_pod_container_status_waiting_reason * on(pod) group_left kube_pod_labels{component="workspace", workspace_type="regular"}
@@ -40,7 +40,7 @@ spec:
       annotations:
         runbook_url: https://github.com/gitpod-io/runbooks/blob/main/runbooks/GitpodWorkspaceStuckOnStopping.md
         summary: 5 or more workspaces are stuck on stopping
-        description: "{{ printf '%.2f' $value }} {{ $labels.workspace_type }} workspaces are stuck on stopping for more than 20 minutes."
+        description: '{{ printf "%.2f" $value }} {{ $labels.workspace_type }} workspaces are stuck on stopping for more than 20 minutes.'
       expr: |
         sum(
           gitpod_ws_manager_workspace_phase_total{type="REGULAR", phase="STOPPING"}