- Add http_auth module accepting 401/403 status codes - Apply http_auth to grafana, code-server, pgweb, velero-ui - These services return 401 when accessed without authentication
- Add blackbox-exporter with prometheus-community Helm chart - Configure HTTP probes for 25 external endpoints - Include SSL certificate expiry alerting rules - Add probe failure and slow response alerts - Deploy 2 replicas with anti-affinity for HA