I have been using UptimeRobot for a long time to keep track of when things go down. The problem is, sometimes node dies and nginx stays up, so there is still an http response. What are you all using to get notifications of problems with NodeBB?
I think it stopped working in 1.13 - I remember it being there in 1.12 and there were no updates to that plugin for a long time.
I'm not sure if it wasn't a little bugged though - if I remember correctly the side effect of disabling notifications was that your chat window stopped updating global chat at all. You had to reload the tab (or possibly just reopen the popup window if that's what you used) to get new messages.