Setting threshold for Available MBytes
We can gather Available MBytes (\Memory\Available MBytes) of Cloud Service as App Insights telemetry with setting Diagnotics configuration as pic1.png.
However, I don't know how can we determine the supplementary unit for that when we want to set an alert rule. The unit of it appears just "count" as pic2.png.
Also, as far as I checked, it is not "MBytes" but "Bytes" contrary to the name of the counter.
It would be nice if all unit of counters are displayed clearly.
This should be solved in newer metric alerts.