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.
After a recent deployment, the mean latency of a user-facing service increased from 200ms to 500ms. The engineer uses Cloud Trace to analyze traces. Which trace characteristic should the engineer focus on to identify the bottleneck?
Timestamps of the trace ID.
Why wrong: Timestamps help with ordering but not bottleneck identification.
Distribution of span latencies across services.
Span latencies show how long each service took, pinpointing the slowest.
Error count per span.
Why wrong: Error count may indicate failures but not latency issues.
Total number of spans in the trace.
Why wrong: Number of spans does not indicate latency contribution.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Distribution of span latencies across services.
The engineer should focus on the distribution of span latencies across services (Option B) because Cloud Trace captures the latency of each span in a distributed trace. By examining the histogram or distribution of span latencies, the engineer can identify which specific service or component is contributing the most to the overall increase from 200ms to 500ms, pinpointing the bottleneck. This approach aligns with the principle of distributed tracing, where the critical path is determined by the slowest span in the trace.
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.
Timestamps of the trace ID.
Why it's wrong here
Timestamps help with ordering but not bottleneck identification.
Distribution of span latencies across services.
Why this is correct
Span latencies show how long each service took, pinpointing the slowest.
Related concept
Read the scenario before looking for a memorised answer.
Error count per span.
Why it's wrong here
Error count may indicate failures but not latency issues.
Total number of spans in the trace.
Why it's wrong here
Number of spans does not indicate latency contribution.
Common exam traps
Google Cloud often tests the misconception that timestamps or error counts are the primary indicators of performance bottlenecks, but in distributed tracing, the distribution of span latencies is the key to identifying which service is the root cause of increased latency.
Detailed technical explanation
In Cloud Trace, each span has a start time and duration, and the span latency distribution is visualized in a waterfall chart or histogram. The engineer can sort spans by duration to identify the longest-running span, which often represents the bottleneck. In a real-world scenario, a database query span might show a latency of 300ms while other spans are under 50ms, directly explaining the overall increase from 200ms to 500ms. This method is more effective than average latency metrics because it isolates the critical path.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Managing service incidents — This question tests Managing service incidents — Read the scenario before looking for a memorised answer..
The correct answer is: Distribution of span latencies across services. — The engineer should focus on the distribution of span latencies across services (Option B) because Cloud Trace captures the latency of each span in a distributed trace. By examining the histogram or distribution of span latencies, the engineer can identify which specific service or component is contributing the most to the overall increase from 200ms to 500ms, pinpointing the bottleneck. This approach aligns with the principle of distributed tracing, where the critical path is determined by the slowest span in the trace.
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.
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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.
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