appservice-alert.json

{
  "$schema": "http://schema.management.azure.com/schemas/2014-04-01-preview/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "alertEmailAddress": {
      "type": "string",
      "metadata": {
        "description": "The email address to receive any alerts."
      }
    },
    "appServiceName": {
      "type": "string",
      "defaultValue": "[uniqueString(subscription().subscriptionId, resourceGroup().name)]",
      "metadata": {
        "description": "The name to use when creating the app service. This must be globally unique."
      }
    }
  },
  "variables": {
    "appServicePlanName": "AppServicePlan",
    "actionGroupName": "MyApplicationErrors"
  },
  "resources": [
    {
      "name": "[variables('appServicePlanName')]",
      "type": "Microsoft.Web/serverfarms",
      "location": "[resourceGroup().location]",
      "apiVersion": "2015-08-01",
      "kind": "app",
      "sku": {
        "name": "F1",
        "tier": "Free",
        "size": "F1",
        "family": "F",
        "capacity": 1
      },
      "properties": {
        "name": "[variables('appServicePlanName')]",
        "numberOfWorkers": 1
      }
    },
    {
      "name": "[parameters('appServiceName')]",
      "type": "Microsoft.Web/sites",
      "location": "[resourceGroup().location]",
      "apiVersion": "2015-08-01",
      "kind": "web",
      "properties": {
        "name": "[parameters('appServiceName')]",
        "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]",
        "siteConfig": {
          "minTlsVersion": "1.2"
        },
        "httpsOnly": true,
        "clientAffinityEnabled": false
      },
      "dependsOn": [
        "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
      ]
    },
    {
      "name": "[variables('actionGroupName')]",
      "type": "Microsoft.Insights/actionGroups",
      "location": "global",
      "apiVersion": "2018-03-01",
      "properties": {
        "groupShortName": "App Service",
        "enabled": true,
        "emailReceivers": [
          {
            "name": "Account Owner",
            "emailAddress": "[parameters('alertEmailAddress')]"
          }
        ]
      }
    },
    {
      "name": "HttpExceptions",
      "type": "Microsoft.Insights/metricAlerts",
      "location": "global",
      "apiVersion": "2018-03-01",
      "properties": {
        "description": "[concat('The number of HTTP 5xx responses has increased beyond the specified threshold.')]",
        "severity": 2,
        "enabled": true,
        "scopes": [
          "[resourceId('Microsoft.Web/sites', parameters('appServiceName'))]"
        ],
        "evaluationFrequency": "PT5M",
        "windowSize": "PT1H",
        "criteria": {
          "odata.type": "Microsoft.Azure.Monitor.SingleResourceMultipleMetricCriteria",
          "allOf": [
            {
              "name": "HTTP 5xx greater than 3",
              "metricName": "Http5xx",
              "operator": "GreaterThan",
              "threshold": 3,
              "timeAggregation": "Maximum"
            }
          ]
        },
        "actions": [
          {
            "actionGroupId": "[resourceId('Microsoft.Insights/actionGroups', variables('actionGroupName'))]"
          }
        ],
        "dependsOn": [
          "[resourceId('Microsoft.Insights/actionGroups', variables('actionGroupName'))]",
          "[resourceId('Microsoft.Web/sites', parameters('appServiceName'))]"
        ]
      }
    }
  ]
}