Everything, and whether it is up

How to read a line

• Up means the service returned the status code it is supposed to return. For most that is 200; for the few behind a password it is 401, and demanding 200 there would report an outage forever.
• Down means it answered with something else, or did not answer within fifteen seconds. The reason is printed under the name.
• Not checked means there is nothing to send a request to. A Telegram bot dials out and has no inbound endpoint; saying so is better than counting it as healthy without having looked.
• A service answering 429 counts as up. That is its rate limiter replying, which proves it is running — and this five-minute poll is the likeliest thing to have tripped it.
• The row of marks is the last 48 checks, oldest on the left, so about four hours. The percentage beside it is measured over the samples kept per service — 288 of them, which at one check every five minutes is a day. Only real checks count towards it.