PCDOE Implementing service monitoring strategies Practice Question
An e-commerce platform is using Cloud Load Balancing with a backend service that has a custom health check. The health check is failing intermittently, causing traffic to be routed away from healthy instances. The team has enabled Cloud Logging and wants to diagnose the issue. Which log view should they examine to see the health check probe results?
⚠ Common exam trap
Many candidates confuse VPC flow logs (which show network-level traffic) with load balancer logs (which show application-level health check results), or assume that audit logs or serial console logs would contain runtime health check data.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Load balancer logs (type: 'loadbalancing.googleapis.com')
Load balancer logs (type: 'loadbalancing.googleapis.com') contain detailed records of health check probes, including the probe source IP, target instance, response code, and latency. This is the exact log view that captures health check probe results, enabling the team to identify intermittent failures by correlating probe timestamps with instance health status changes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VPC flow logs
Why it's wrong here
VPC flow logs show packet-level traffic, not health check results.
- ✗
Cloud Audit Logs (Admin Activity)
Why it's wrong here
Audit logs track administrative actions, not health checks.
- ✗
Instance serial port output logs
Why it's wrong here
Serial port logs show OS-level boot and console messages.
- ✓
Load balancer logs (type: 'loadbalancing.googleapis.com')
Why this is correct
Load balancer logs contain health check probe results.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCDOE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCDOE exam.