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 (?)
@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).
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