We are using the script check_time_snmp.pl to monitor the server time. This plugin compares the time of the remote server with the time of the Icinga server. But on November 6th, there was a Daylight saving time switch and we got an alert for multiple devices for 1 hour (Alert cleared after an hour)
Both the remote server and Icinga server were using EDT and during the time switch, it jumped one hour backward on both servers, so while comparing the time of the remote server and the Icinga server there should not be a 1-hour delay as shown in the image above. Can anyone have any idea what caused this alert?