Private URL monitoring
The ability to monitor private endpoints e.g. internal VPN connections would be a great feature for us. I imagine it would have to be a small agent/executable that reports to the API (?)

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@Stefan thanks for commenting, the suggestion you are talking about (sometimes also called "pulse" or "cron" monitoring) is actually planned and tracked here: https://updown.uservoice.com/forums/177972-general/suggestions/5586072-periodic-task-cron-monitoring.
The suggestion from Michael here is more about some kind of proxy daemon you could install so updown can access your private network "directly" (which is less likely to happen).
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Stefan Schmidbauer commented
That's a cool idea! I imagine if updown had some sort of passive host entry in their portal which one could POST to in the frequency one wants, it could display it as a time series