its a very, very simple update alert to add to Prometheus to monitor that, and alert if the cert is within so many days of expiring. You need the 'blackbox exp

its a very, very simple update alert to add to Prometheus to monitor that, and alert if the cert is within so many days of expiring. You need the 'blackbox exporter' and a simple rule such as: alert: TlsCertExpiringSoon expr: (probe_ssl_earliest_cert_expiry - time()) < (86400 * 14) for: 10m labels: product: Name_of_Product severity: page annotations: description: the tls cert for the URL {{ $labels.instance }} expires in less than 14 days! summary: TLS cert for {{$labels.instance}} expiring