You are deploying your application to a Compute Engine virtual machine instance with the Stackdriver Monitoring Agent installed. Your application is a unix process on the instance. You want to be alerted if the unix process has not run for at least 5 minutes. You are not able to change the application to generate metrics or logs.

Which alert condition should you configure?

A. Uptime check

B. Process health

C. Metric absence
D. Metric threshold

Reference: https://cloud.google.com/monitoring/alerts/concepts-indepth