Question

You operate a public-facing web application running behind an HTTP(S) load balancer. Management wants to be notified within minutes if the application's homepage becomes unreachable from external locations, and the on-call engineer should receive the alert via email. Using Cloud Monitoring, what is the most appropriate way to configure this?

Accepted Answer

Create an uptime check targeting the application URL, then create an alerting policy based on the uptime check failure with an email notification channel.

Answer

Create a log-based metric that counts HTTP 500 responses and configure an alerting policy that emails the on-call engineer.

Answer

Enable Error Reporting on the application and configure it to send email notifications when new errors are detected.

Answer

Create a Cloud Monitoring dashboard displaying the load balancer's request latency and check it periodically.