fix: Grafana dashboards should display a warning when Prometheus is not available #14834
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Problem: When Prometheus is unavailable or not configured properly, users viewing Grafana dashboards would see panels with no data or errors without clear guidance on what the issue might be. Solution: Added a warning panel at the top of all Linkerd Grafana dashboards that checks for Prometheus availability using the prometheus_ready metric. When Prometheus is not receiving data, the panel displays a warning message: "Prometheus is not receiving data. Please check your Prometheus configuration and ensure it is running." The warning panel: - Uses a stat panel type at position (0,0) spanning the full width - Queries the prometheus_ready metric for instant health check - Shows a transparent background when Prometheus is working normally - Displays a red warning message when Prometheus is unavailable - Is added to all 18 Linkerd Grafana dashboards Fixes linkerd#3337 Signed-off-by: majiayu000 <1835304752@qq.com>
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Summary
This PR fixes #3337
Changes
grafana/dashboards/authority.jsongrafana/dashboards/cronjob.jsongrafana/dashboards/daemonset.jsongrafana/dashboards/deployment.jsongrafana/dashboards/health.jsongrafana/dashboards/job.jsongrafana/dashboards/kubernetes.jsongrafana/dashboards/multicluster.jsongrafana/dashboards/namespace.jsongrafana/dashboards/pod.jsongrafana/dashboards/prometheus-2-stats.jsongrafana/dashboards/prometheus-benchmark.jsongrafana/dashboards/replicaset.jsongrafana/dashboards/replicationcontroller.jsongrafana/dashboards/route.jsongrafana/dashboards/service.jsongrafana/dashboards/statefulset.jsongrafana/dashboards/top-line.json