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Answer: Stackdriver uptime checks
The correct answer is **B. Stackdriver uptime checks**. Uptime checks are specifically designed to monitor the availability of applications by sending periodic requests to a specified endpoint (e.g., the load balancer's URL). If the application becomes unavailable, uptime checks trigger alerts via Cloud Monitoring, providing immediate visibility into downtime. While options C and D (health checks) ensure traffic is routed to healthy instances and enable auto-healing of VMs, they are infrastructure-level checks and do not inherently generate alerts for application unavailability. Smoke tests (A) are manual or post-deployment validations, not continuous monitoring solutions. Uptime checks directly simulate user access and are the best choice for proactive alerting.
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You have a production application deployed on Compute Engine VM instances managed by an instance group, with traffic routed through an HTTP(s) load balancer. Users are unable to access the application. What monitoring technique should you implement to receive alerts when the application becomes unavailable?
A
Smoke tests
B
Stackdriver uptime checks
C
Cloud Load Balancing - heath checks
D
Managed instance group - heath checks