This template has an Appservice plan + App Insights + Webapp (with app inshights extension and hybrid connection) + Slot (with app inshights extension and hybrid connection)

webapptemplate.json

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "appServiceName": {
      "type": "string",
      "minLength": 1
    },
    "webAppName": {
      "type": "string",
      "minLength": 1
    },
    "stagingSlotName": {
      "type": "string",
      "minLength": 1
    },
    "appInsightsName": {
      "type": "string",
      "minLength": 1
    },
    "hybridConnectionName":{
      "type": "string",
      "minLength": 1
    },
    "relayName":{
      "type": "string",
      "minLength": 1
    },
    "relayResourceGroupName":{
      "type": "string",
      "minLength": 1
    },
    "skuService": {
      "type": "string",
      "minLength": 1,
      "defaultValue": "S1"
    }
  },
  "variables": {
    "hybridConnectionResourceId": "[resourceId(parameters('relayResourceGroupName'), 'Microsoft.Relay/Namespaces/Hybridconnections', parameters('relayName'), parameters('hybridConnectionName'))]"
  },
  "resources": [
    {
        "type": "Microsoft.Web/serverfarms",
        "apiVersion": "2016-09-01",
        "name": "[parameters('appServiceName')]",
        "location": "[resourceGroup().location]",
        "sku": {
            "name": "[parameters('skuService')]",
            "capacity": 1
        },
        "tags": {
            "displayName": "[parameters('appServiceName')]"
        },
        "properties": {
            "name": "[parameters('appServiceName')]"
        }
    },
    {
      "apiVersion": "2014-04-01",
      "name": "[parameters('appInsightsName')]",
      "type": "Microsoft.Insights/components",
      "location": "[resourceGroup().location]",
      "tags": {
          "[concat('hidden-link:', resourceGroup().id, '/providers/Microsoft.Web/sites/', parameters('webAppName'))]": "Resource",
          "displayName": "AppInsightsComponent"
      },
      "properties": {
          "applicationId": "[parameters('appInsightsName')]"
      }
    },
    {
      "name": "[parameters('webAppName')]",
      "type": "Microsoft.Web/sites",
      "location": "[resourceGroup().location]",
      "apiVersion": "2015-08-01",
      "dependsOn": [
        "[resourceId('Microsoft.Web/serverfarms', parameters('appServiceName'))]"
      ],
      "tags": {
        "[concat('hidden-related:', resourceId('Microsoft.Web/serverfarms', parameters('appServiceName')))]": "Resource",
        "displayName": "webApp"
      },
      "properties": {
        "name": "[parameters('webAppName')]",
        "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', parameters('appServiceName'))]",
        "siteConfig": {
          "AlwaysOn": true,          
          "use32BitWorkerProcess": false
        }
      },
      "resources": [
        {
          "apiVersion": "2015-08-01",
          "name": "[parameters('stagingSlotName')]",
          "type": "slots",
          "tags": {
            "displayName": "webAppSlots"
          },
          "location": "[resourceGroup().location]",
          "dependsOn": [
            "[resourceId('Microsoft.Web/Sites', parameters('webAppName'))]"
          ],
          "properties": {            
            "siteConfig": {
              "AlwaysOn": true,
              "use32BitWorkerProcess": false
            }
          },
          "resources": [
            {
              "apiVersion": "2016-08-01",
              "name": "Microsoft.ApplicationInsights.AzureWebSites",
              "type": "siteextensions",
              "dependsOn": [                 
                 "[resourceId('Microsoft.Web/Sites/Slots', parameters('webAppName'), parameters('stagingSlotName'))]"                 
              ],
              "properties": {
              }
            },
            {
              "apiVersion": "2018-02-01",
              "name": "[concat(parameters('relayName'), '/', parameters('hybridConnectionName'))]",
              "type": "hybridConnectionNamespaces/relays",
              "location" : "[resourceGroup().location]",
              "dependsOn": [
                "[resourceId('Microsoft.Web/Sites/Slots', parameters('webAppName'), parameters('stagingSlotName'))]"
              ],
              "properties": {
                "serviceBusNamespace": "[parameters('relayName')]",
                "relayName": "[parameters('hybridConnectionName')]",            
                "relayArmUri": "[variables('hybridConnectionResourceId')]",
                "hostName": "[split(json(reference(variables('hybridConnectionResourceId'), '2016-07-01').userMetadata)[0].value, ':')[0]]",
                "port": "[split(json(reference(variables('hybridConnectionResourceId'), '2016-07-01').userMetadata)[0].value, ':')[1]]",
                "sendKeyName": "defaultSender",
                "sendKeyValue": "[listkeys(concat(variables('hybridConnectionResourceId'), '/authorizationRules/defaultSender'), '2017-04-01').primaryKey]"
              }
            }
          ]
        },
        {
          "apiVersion": "2015-08-01",
          "name": "appsettings",
          "type": "config",
          "dependsOn": [
              "[resourceId('Microsoft.Web/Sites', parameters('webAppName'))]",
              "Microsoft.ApplicationInsights.AzureWebSites"
          ],
          "properties": {
              "APPINSIGHTS_INSTRUMENTATIONKEY": "[reference(concat('microsoft.insights/components/', parameters('appInsightsName'))).InstrumentationKey]"
          }
        },
        {
          "apiVersion": "2015-08-01",
          "name": "slotconfignames",
          "type": "config",
          "dependsOn": [
              "[resourceId('Microsoft.Web/Sites', parameters('webAppName'))]",
              "appsettings"
          ],
          "properties": {
              "connectionStringNames": [ ],
              "appSettingNames": [ "APPINSIGHTS_INSTRUMENTATIONKEY" ]
          }
        },
        {
          "apiVersion": "2015-08-01",
          "name": "Microsoft.ApplicationInsights.AzureWebSites",
          "type": "siteextensions",
          "dependsOn": [
              "[resourceId('Microsoft.Web/Sites', parameters('webAppName'))]"
          ],
          "properties": {
          }
        },
        {
          "apiVersion": "2018-02-01",
          "name": "[concat(parameters('relayName'), '/', parameters('hybridConnectionName'))]",
          "type": "hybridConnectionNamespaces/relays",
          "location" : "[resourceGroup().location]",
          "dependsOn": [
            "[resourceId('Microsoft.Web/Sites', parameters('webAppName'))]"
          ],
          "properties": {
            "serviceBusNamespace": "[parameters('relayName')]",
            "relayName": "[parameters('hybridConnectionName')]",            
            "relayArmUri": "[variables('hybridConnectionResourceId')]",
            "hostName": "[split(json(reference(variables('hybridConnectionResourceId'), '2016-07-01').userMetadata)[0].value, ':')[0]]",
            "port": "[split(json(reference(variables('hybridConnectionResourceId'), '2016-07-01').userMetadata)[0].value, ':')[1]]",
            "sendKeyName": "defaultSender",
            "sendKeyValue": "[listkeys(concat(variables('hybridConnectionResourceId'), '/authorizationRules/defaultSender'), '2017-04-01').primaryKey]"
          }
        }
      ]
    }
  ],
  "outputs": {
  }
}