alert on number of active messages in a SUBSCRIPTION
Currently you can only create an alert on the number of messages in a topic...which is pretty useless. We need to be able to target a specific subscription for alerts!
Joseph Ficara commented
Having the ability to alert on each subscriptions DLQ is pretty important. This would allow us to better understand when there are issues in production and act on the proactively.
Subscription based metrics should definitely be available on the "metrics" blade... especially considering that the data is available in the "Subscriptions" area. Also, in that area, only the total message count is displayed. It would be nice if that number could be broken out into scheduled, active, DLQ, etc. Under the covers, the API call that populates that data in the Azure portal is pulling all of that data back... it's just summing the value to display.