I configured azure metric alert when there is a dead-lettered message in a specific topic.
The dead-lettered queue only has one message but I discovered that when using Average, it is not always remain as absolute number (1) sometime it shows as 0.8 or 1.2
And when I used Maximum, it shows as 2 messages in the dead-lettered queue (sometime fluctuate to 1).
Any idea how does Azure actually calculate the dead-lettered queue metrics?
Thanks