The app currently supports checking expiration dates of local certificates only. If you have a host with all the certs, you could use it on that host to monitor all the certs (PKI machines might have all your certs for example).
I'll add this as an enhancement request for the next time I write code for this app though.
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Yeah this app won't help you then, sorry!
Nice use case though. I do have the commands for remotely checking an expiry date on ssl certs. Would you like those for reference? Maybe you can write your own script.