I manage several wildcard SSL certificates for my services, and some of them require manual renewal. To avoid unexpected certificate expirations and last-minute renewals, I developed a simple Prometheus exporter in Go that monitors SSL certificates delays. Targets are passed in GET parameter by Prometheus to the exporter.
The exporter runs in a Docker container.
A Grafana dashboard JSON file is also present in the repo.
More information is available on the GitHub repository: https://github.com/janbellon/ssl_exporter
