This Microsoft Teams app consists of two components:
- An Azure Function that basically delivers a custom web app with an HTTP trigger
- The Microsoft Teams specification that can be configured using the built-in App Studio
In general, this code could also live anywhere else. It does not need to be an Azure Function. This code could also be deployed to any local web server that is available for the Microsoft Teams users.
The Azure Function can be created without any specific requirements to keep in mind. You can simply create a Function App and add a HTTP triggered function. The code used here is based on Node.js,m but you can actually also adopt it to any other language of your choice.
To customize the function you need to speficy a couple of Azure Functions Application Settings:
- NEWRELIC_USER_KEY: the New Relic user API key
- NEWRELIC_DASHBOARD_ENTITYGUID: the entity GUID of the dashboard you want to display in Microsoft Teams
- REFRESH_INTERVAL: the refresh interval for the dashboard to automatically refresh
- IS_REFRESH_PAGE: an indicator on whether you want to refresh (true) the dashboard within the Microsoft Teams app or not (false)
The Azure Function then leverages New Relic's NerdGraph interface in order to create a snapshot URL for the given dashboard and displays this dashboard as an image in the Microsoft Teams app.
To configure the Microsoft Teams App, the easiest way to achieve this is by using the files in the NewRelicTeamsApp folder. You need to customize the staticTabs part of the manifest.json and enter the appropriate contentUrl from the Azure Function.
You can then zip the entire NewRelicTeamsApp folder and import into App Studio. 
