About todays Telegram alert
Accually everyone got this message today including me
Today there was time change exactly at that moment.
Le me tell you what happened.

There was 01:59 a.m.
Then at the 2:00 the was time change which teleported all servers clocks from 2:00 to 3:00.
And in database all rigs had still the last update time as 2:00.
But then kicked in telegram cron which saw that all rigs had last report hour ago (more than 15 minutes from current server time).
OK then so lets send notifications to all users and wake them up
One minute later all rigs updated their status to and in database appeared new good date as 03:01 a.m in all rigs lastUpdate time.
Then telegram ofcourse send another batch of notifications after 15 minutes rigs beeing online

So anyway, the rigs were mining and they did not see any change, but my servers saw the change in time and reacted as they were programmed.
Thats why You did not see that problem yourself but the server saw it
So thats what happened here