CertFleet watches two things that take sites down and are usually monitored by two different products: TLS certificate expiry and HTTP uptime. Staged alerts at 30/14/7/1 days, email/Slack/webhook, Certificate Transparency new-issuance alerts, DNS and domain-expiry monitoring, and public status pages. Free forever for 10 certificates and 10 uptime monitors. The SSL checker needs no account at all.
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I kept getting paged for expired certificates that my ACME client swore it had renewed. The renewal had worked — the web server just never got reloaded, so it kept serving the old cert from memory until it expired. CT and the CA dashboard both looked fine. Port 443 disagreed.
CertFleet opens a real TLS socket on 443 and reads the X.509 the server actually presents (issuer, SANs, chain, TLS version, days left), then can watch HTTP uptime on the same product.
Free forever for 10 SSL certs + 10 uptime monitors. There's also a public SSL checker with no account: https://certfleet.net/ssl-checker
Happy to answer anything about TLS probing, CT alerts, or the Cloudflare stack (Workers + D1 + external probe).