Modify your grafana panel then.
If you use the PromQL expression browser in prometheus (normally on port
9090) and start typing "probe_" you'll see from autocompletion that there's
a metric called probe_ssl_earliest_cert_expiry, which gives you the actual
expiry date as unix timestamp.
I don't know if Grafana can show unix timestamps as human-readable time,
but the expression
(probe_ssl_earliest_cert_expiry - time())/86400
will give you the number of days until it expires, which is perfectly fine
as a gauge. You can make it go yellow or red for values below thresholds
that you choose.
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