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You can check the solutions here: https://certificate.transparency.dev/monitors/
Thank you but there is not a single free or self hosted solution linked on the website
report-uri.com?
crt.sh?
just use hetrixtools, you can monitor ssl expiration date for free
If you are looking for a selfhosted solution, Uptime Kuma (https://github.com/louislam/uptime-kuma) might be an idea. It can monitor certificate expiry, but I'm not sure if will alert you if the certificate changes.
As far as I can see it can't notify if cert is about to expire.
Thank you all, I'll use hetrixtools