As far as I could gather these seem to represent some sort of progress bar but I'm not sure for what exactly or how to interpret them. Colour changes based on alarm type.
Ive Herreman [SLC] [DevOps Catalyst] Answered question 17th August 2023
Hi Edib
This is the Alarm Duration Indicator, this is a visual representation how long the alarm has been active on the system.
The longer it has been active, the "wider" the progress bar.
Edib Šupić [SLC] [DevOps Catalyst] Selected answer as best 17th August 2023