We can also assess poor performances of instances available too.
In Site Metrics, we can see the overall metrics values or instance-based metrics values to monitor. It shows the 2xx, 3xx, 4xx, Http server errors, and average response time:
Metrics per instances (Apps) also shows values of the CPU time and average memory utilization.
Apart from this, it also shows Data In (MBytes), Data Out (MBytes), Local read bytes (MBytes), Local written bytes (MBytes), Network read bytes (MBytes), and Network written ...