Agent based monitoring with app insights

[ejizba]

The monitoring team has provided an agent we can use that will automatically track a lot of beneficial information for users. The agent is already added for web apps, but we would need to make sure it's included in our windows and linux images for function apps. Then we would just need to make sure we load the agent (something like require /agents/node/build/src/Loader.js).

A description for web apps agent-based monitoring here:
https://docs.microsoft.com/en-us/azure/azure-monitor/app/azure-web-apps#enable-application-insights

The agent is here (internal link):
https://dev.azure.com/msazure/One/_git/MGMT-AppInsights-NodeJS-IPA