How do I monitor memory utilization for Azure Scale-set default metrics is only CPU Disk and network. Why does Azure not provide memory utilization by default
Azure Scale-set how to monitor memory utilization
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If you are running a single instance of your webapp there is nothing to actually load balance. Hence, you would just setup scaling in the portal based on a particular metric. For example, if CPU % > 80% for X mins then Scale up to X instances. Then set another rule that states when CPU < 80% for X mins then scale down to X instances.
If you were to setup two instances and load balance them you would have to add a load balance on top of the instances. This is simple to do. Then from there you could also set the same monitoring rules.
https://docs.microsoft.com/en-us/azure/architecture/best-practices/auto-scaling
https://azure.microsoft.com/en-us/features/autoscale/
https://docs.microsoft.com/en-us/azure/monitoring-and-diagnostics/insights-autoscale-best-practices
They have removed the "host metric" memory from VM's. You have to use the new Insight option to expose the memory usage.
https://azure.microsoft.com/en-us/blog/rich-insights-for-virtual-machines-from-azure-monitor/
Go to your VM -> Monitoring -> Insight and onboard it to Insight if needed. After it is onboarded and has started collecting data(20-30 min) you can choose the performance tab:
Best Answer
in order to enable custom metrics (that includes memory utilization) for the Virtual Machine Scale Set you need to modify the ARM template.
Documentation: