Secure Zone Monitor
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I know there are online tools for monitoring the trust chain. But in the spirit of my handle (NOYB); It is None Of Their Business. i.e. don't like relying on third party tools for monitoring. Like for it to be in house service.
Think it would make a good addition to pfSense. Maybe something as simple as just periodically requesting a specified record and generating an alert if the response cannot be validated.