Merge pull request #117466 from rapopescu16/patch-19

Update monitor-instances-health-check.md

Author: Court72

articles/app-service/monitor-instances-health-check.md

@@ -45,6 +45,7 @@ Note that _/api/health_ is just an example added for illustration purposes. We d
 > - The Health check path should check critical components of your application. For example, if your application depends on a database and a messaging system, the Health check endpoint should connect to those components. If the application can't connect to a critical component, then the path should return a 500-level response code to indicate the app is unhealthy. Also, if the path does not return a response within 1 minute, the health check ping is considered unhealthy.
 > - When selecting the Health check path, make sure you're selecting a path that returns a 200 status code, only when the app is fully warmed up.
 > - In order to use Health check on your Function App, you must use a [premium or dedicated hosting plan](../azure-functions/functions-scale.md#overview-of-plans).
+> - Details about Health check on Function Apps can be found here: [Monitor function apps using Health check](/azure-functions/configure-monitoring?tabs=v2#monitor-function-apps-using-health-check).
 
 > [!CAUTION]
 > Health check configuration changes restart your app. To minimize impact to production apps, we recommend [configuring staging slots](deploy-staging-slots.md) and swapping to production.
@@ -65,6 +66,9 @@ Health check integrates with App Service's [authentication and authorization fea
 
 If you're using your own authentication system, the Health check path must allow anonymous access. To secure the Health check endpoint, you should first use features such as [IP restrictions](app-service-ip-restrictions.md#set-an-ip-address-based-rule), [client certificates](app-service-ip-restrictions.md#set-an-ip-address-based-rule), or a Virtual Network to restrict application access. Once you have those features in-place, you can authenticate the health check request by inspecting the header, `x-ms-auth-internal-token`, and validating that it matches the SHA256 hash of the environment variable `WEBSITE_AUTH_ENCRYPTION_KEY`. If they match, then the health check request is valid and originating from App Service. 
 
+> [!NOTE]
+> Specifically for [Azure Functions authentication](/azure/azure-functions/security-concepts?tabs=v4#function-access-keys), the function that serves as Health check endpoint needs to allow anonymous access. 
+
 ##### [.NET](#tab/dotnet)
 
 ```C#