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Implementing service monitoring strategies →hardMultiple ChoiceObjective-mapped

PCDOE Implementing service monitoring strategies Practice Question

This PCDOE practice question tests your understanding of implementing service monitoring strategies. 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.

Exhibit

Refer to the exhibit.
```yaml
apiVersion: monitoring.googleapis.com/v1
kind: ServiceMonitor
metadata:
  name: my-service-monitor
  namespace: default
spec:
  selector:
    matchLabels:
      app: my-app
  endpoints:
  - port: http
    interval: 30s
  namespaceSelector:
    matchNames:
    - production
  sampleLimit: 1000
  targetLabels:
  - instance
  metricRelabelings:
  - sourceLabels: [__name__]
    regex: 'container_.*'
    action: drop
```

Refer to the exhibit. What is the effect of the metricRelabelings section in this ServiceMonitor?

Question 1hardmultiple choice

Full question →

Exhibit

Refer to the exhibit.
```yaml
apiVersion: monitoring.googleapis.com/v1
kind: ServiceMonitor
metadata:
  name: my-service-monitor
  namespace: default
spec:
  selector:
    matchLabels:
      app: my-app
  endpoints:
  - port: http
    interval: 30s
  namespaceSelector:
    matchNames:
    - production
  sampleLimit: 1000
  targetLabels:
  - instance
  metricRelabelings:
  - sourceLabels: [__name__]
    regex: 'container_.*'
    action: drop
```

A
It adds a label called 'container_' to all metrics.
Why wrong: metricRelabelings modifies metric labels, but here it drops based on __name__.
B
It only keeps metrics whose name starts with 'container_'.
Why wrong: The action is drop, so it removes matching metrics, not keeps them.
C
It renames all metrics with the prefix 'container_' to remove the prefix.
Why wrong: The action is 'drop', not 'replace' or 'keep'.
D
It drops all metrics whose name starts with 'container_'.
The drop action with regex 'container_.*' removes matching metrics.

Full breakdown with real-world context →

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

✓

It drops all metrics whose name starts with 'container_'.

The `metricRelabelings` section in a ServiceMonitor uses Prometheus relabeling rules to modify or filter metrics before ingestion. The `action: drop` directive, combined with a `regex: 'container_.*'` pattern matching the metric name, causes all metrics whose names start with 'container_' to be dropped (i.e., not scraped). This is a common pattern to exclude unwanted metrics and reduce cardinality.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
It adds a label called 'container_' to all metrics.
Why it's wrong here
metricRelabelings modifies metric labels, but here it drops based on __name__.
✗
It only keeps metrics whose name starts with 'container_'.
Why it's wrong here
The action is drop, so it removes matching metrics, not keeps them.
✗
It renames all metrics with the prefix 'container_' to remove the prefix.
Why it's wrong here
The action is 'drop', not 'replace' or 'keep'.
✓
It drops all metrics whose name starts with 'container_'.
Why this is correct
The drop action with regex 'container_.*' removes matching metrics.
Related concept
Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Google Cloud often tests the distinction between `drop` and `keep` actions in relabeling configs, and the trap here is that candidates confuse 'drop' with 'keep' or mistakenly think `metricRelabelings` adds or renames labels instead of filtering metrics.

Detailed technical explanation

How to think about this question

Under the hood, Prometheus relabeling rules are applied sequentially to each target's metric name and label set during the scrape phase. The `source_labels: [__name__]` targets the metric name itself, and the `regex: 'container_.*'` matches any metric name beginning with 'container_'. The `action: drop` instructs Prometheus to discard the entire metric sample if the regex matches, which is critical for controlling cardinality in high-volume environments like Kubernetes, where container-level metrics can explode in number.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

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

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PCDOE question test?

Implementing service monitoring strategies — This question tests Implementing service monitoring strategies — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: It drops all metrics whose name starts with 'container_'. — The `metricRelabelings` section in a ServiceMonitor uses Prometheus relabeling rules to modify or filter metrics before ingestion. The `action: drop` directive, combined with a `regex: 'container_.*'` pattern matching the metric name, causes all metrics whose names start with 'container_' to be dropped (i.e., not scraped). This is a common pattern to exclude unwanted metrics and reduce cardinality.

What should I do if I get this PCDOE question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 30, 2026

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