Add Cert-Manager Prometheus Monitoring Dashboard

[qiridigital]

Summary

Adds a comprehensive Cert-Manager Prometheus monitoring dashboard with 6 sections and 19 panels, covering the full certificate lifecycle.

Closes SigNoz/signoz#6023

Dashboard Sections

1. General Overview (4 value panels)

• Total Certificates — Count of all managed certificates
• Active Certificates — Certificates in Ready state
• Certificate Requests — Controller sync calls processed
• Uptime — Time since last cert-manager restart

2. Certificate Issuance (2 graphs + 1 value)

• Certificates Issued per Issuer — Breakdown by issuer name
• Issuance Rate — Certificate issuance rate over time
• Issuance Success Rate — Success percentage via formula (sync_calls - sync_errors) / sync_calls * 100\

3. Certificate Renewal (2 values + 1 graph)

• Certificates Pending Renewal — Not-ready certificates count
• Renewal Success Rate — Renewal success percentage
• Renewal Duration — ACME client request duration over time

4. Error Metrics (3 graphs)

• Certificate Issuance Errors — Error rate for issuance controller
• Renewal Errors — Error rate for readiness controller
• API Server Errors — ACME API requests with 4xx/5xx status codes

5. Resource Usage (3 graphs)

• CPU Usage — Process CPU consumption
• Memory Usage — Resident memory bytes
• Workqueue Depth — Work queue depth by queue name

6. API and Event Metrics (3 graphs)

• API Request Rate — ACME HTTP request rate by method/status
• Event Processing Rate — Workqueue additions rate
• Failed API Requests — Failed ACME requests by host/status

Template Variables

Variable	Description
\
amespace\	Kubernetes namespace where cert-manager is deployed
\issuer\	Certificate issuer name (e.g., letsencrypt, vault)
\certificate_name\	Specific certificate name filter
\cluster\	Kubernetes cluster (multi-cluster setups)
\deployment_environment\	Environment (production, staging)

Key Metrics Used

• \certmanager_certificate_ready_status\ — Certificate readiness state
• \certmanager_controller_sync_call_count\ / \certmanager_controller_sync_error_count\ — Controller operations
• \certmanager_http_acme_client_request_count\ / \certmanager_http_acme_client_request_duration_seconds\ — ACME client
• \process_cpu_seconds_total\ / \process_resident_memory_bytes\ — Resource usage
• \workqueue_adds_total\ / \workqueue_depth\ — Event processing

Implementation Notes

• Uses SigNoz Query Builder format for 18/19 panels (PromQL used only for uptime calculation requiring \ ime()\ function)
• Dashboard schema version: v4
• Follows naming convention: \cert-manager-prometheus-v1.json\
• Includes OpenTelemetry Collector configuration in README for metrics ingestion via Prometheus receiver on port 9402
• References: cert-manager Prometheus Metrics and Grafana Dashboard #11001

Files

• \cert-manager/cert-manager-prometheus-v1.json\ — Dashboard JSON (102KB, 19 panels)
• \cert-manager/readme.md\ — Documentation with OTel Collector config