Hi Quang,

you can use any of the available monitoring solutions on the market to monitor system health metrics such as CPU, Memory, Network etc.

If you want to monitor specific FSM metrics, you would need to implement a solution that is able to retrieve metrics from .NET Applications. In Azure, for example, Azure Application Insights can be used. 
However, you can also monitor some metrics related to IIS with MS standard tools, see here for example:
https://techcommunity.microsoft.com/t5/iis-support-blog/performance-counters-for-monitoring-iis/ba-p/683389

Best regards
Roman