I have my account set to receive SMS alerts for “down” events only. However, I also receive SMS for “Degraded performance has ended” events (which I do not want) as well as for “Degraded performance detected” events (which I would expect).
This is not only a nuisance (my ringtone for UptimeRobot is the ST:TOS “Red Alert” klaxon and will override do-not-disturb settings!) but is also a bit costly as you charge for SMS alerts.