CertSentry

CertSentry is a web app (with optional Slack/Teams alerts) that continuously monitors TLS certificates across your domains, subdomains, load balancers, and CDN endpoints—then tells you exactly what will break and why. It detects upcoming expirations, mismatched chains, missing intermediates, weak ciphers, and misconfigured SNI across multi-cloud setups (AWS, GCP, Azure) and popular CDNs. The product focuses on practical remediation: it maps each failing endpoint to the owning service, repo, and on-call rotation, and generates step-by-step runbooks tailored to your stack (ACME/Let’s Encrypt, AWS ACM, Cloudflare, etc.). It also tracks certificate inventory and “shadow certs” created by teams without central visibility. This is not a generic uptime monitor; it’s a certificate-specific reliability tool that reduces incident risk and pager fatigue for modern hosting environments.