This PCDOE practice question tests your understanding of managing service incidents. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An engineer receives an alert that a service's error rate has exceeded the threshold. To investigate, which log-based metric should the engineer query in Cloud Logging to identify the root cause?
Error log count grouped by service name.
Grouping by service reveals which service has the most errors.
Request latency histogram.
Why wrong: Latency is not error cause.
CPU utilization of the service instances.
Why wrong: CPU may correlate but is not a root cause of errors.
Network bytes sent per instance.
Why wrong: Network traffic does not indicate error sources.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Error log count grouped by service name.
Option A is correct because error log count grouped by service name directly surfaces which specific service is generating the elevated error rate. In Cloud Logging, log-based metrics are user-defined counters extracted from log entries; querying the error log count per service isolates the offending component, enabling root cause identification without mixing in unrelated performance data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Error log count grouped by service name.
Why this is correct
Grouping by service reveals which service has the most errors.
Related concept
Read the scenario before looking for a memorised answer.
Request latency histogram.
Why it's wrong here
Latency is not error cause.
CPU utilization of the service instances.
Why it's wrong here
CPU may correlate but is not a root cause of errors.
Network bytes sent per instance.
Why it's wrong here
Network traffic does not indicate error sources.
Common exam traps
Google Cloud often tests the distinction between log-based metrics (derived from log entries) and system metrics (like CPU or network) from Cloud Monitoring, trapping candidates who confuse performance indicators with error source identification.
Detailed technical explanation
Log-based metrics in Cloud Logging are defined using filters (e.g., severity="ERROR" AND resource.type="k8s_container") and can be aggregated by labels like service name. Under the hood, these metrics are ingested into Cloud Monitoring as custom counters, enabling real-time alerting and dashboards. In a microservices architecture, grouping error logs by service name quickly isolates a failing deployment or a misconfigured dependency, whereas raw logs would require manual correlation across hundreds of entries.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Managing service incidents — study guide chapter
Learn the concepts, then practise the questions
Managing service incidents practice questions
Targeted practice on this topic area only
All PCDOE questions
500 questions across all exam domains
Google Professional Cloud DevOps Engineer study guide
Full concept coverage aligned to exam objectives
PCDOE practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise PCDOE questions linked to Bootstrapping a Google Cloud organization for DevOps.
Practise PCDOE questions linked to Managing service incidents.
Practise PCDOE questions linked to Managing Google Cloud costs.
Practise PCDOE questions linked to Building and implementing CI/CD pipelines.
Practise PCDOE questions linked to Implementing service monitoring strategies.
Practise PCDOE questions linked to Optimizing service performance.
Practise PCDOE questions linked to PCDOE fundamentals.
Practise PCDOE questions linked to PCDOE scenario.
Practise PCDOE questions linked to PCDOE troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Managing service incidents — This question tests Managing service incidents — Read the scenario before looking for a memorised answer..
The correct answer is: Error log count grouped by service name. — Option A is correct because error log count grouped by service name directly surfaces which specific service is generating the elevated error rate. In Cloud Logging, log-based metrics are user-defined counters extracted from log entries; querying the error log count per service isolates the offending component, enabling root cause identification without mixing in unrelated performance data.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 30, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.