Azure Functions Logging to Application Insights

arm-template.json

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    ...
  },
  "variables": {
    ...
  },
  "resources": [
    // Application Insights
    {
      "type": "Microsoft.Insights/components",
      "apiVersion": "2014-04-01",
      ...
      // Set the "kind" value to "other", which is "General".
      "kind": "other",
      ...
    },
    // Function App
    {
      "type": "Microsoft.Web/sites",
      "apiVersion": "2015-08-01",
      ...
      // Set the "kind" value to "functionapp"
      "kind": "functionapp",
      ...
      "resources": [
        {
          "type": "config",
          "apiVersion": "2015-08-01",
          // Set the "AppSettings" section
          "name": "appsettings",
          "properties": {
            ...
            // Set the Instrumentation Key directly within ARM template
            "APPINSIGHTS_INSTRUMENTATIONKEY": "[reference(resourceId('Microsoft.Insights/components', variables('applicationInsightsName')), '2014-04-01').InstrumentationKey]",
            ...
          }
        }
      ],
      ...
    }
  ],
  "outputs": {}
}