Integrate Prometheus and Grafana for Monitoring

[sehkone]

Goal

Add Prometheus + Grafana to the local infra stack and expose metrics for step-ca and OpenBao, with a basic dashboard for operational visibility.

Scope

• docker-compose
  • Add Prometheus and Grafana services
  • Add scrape config for step-ca and OpenBao
• step-ca
  • Enable metrics endpoint
• OpenBao
  • Enable metrics endpoint and scrape by Prometheus
• Grafana
  • Add a basic dashboard (step-ca + OpenBao)

Acceptance Criteria

• Prometheus scrapes step-ca metrics
• Prometheus scrapes OpenBao metrics
• Grafana dashboard shows core health/traffic/error signals for both
• docker-compose up brings up all monitoring components

Notes

• Keep configs minimal and local-dev focused
• Do not expose metrics outside the docker network by default