PCD Managing application performance monitoring Practice Question
This PCD practice question tests your understanding of managing application performance monitoring. 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.
A developer wants to view real-time logs from a running application on Compute Engine. Which two methods can they use to stream logs? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Using the Logs Explorer's 'Stream logs' feature
Option A is correct because the Logs Explorer in the Google Cloud Console provides a 'Stream logs' feature that allows you to view real-time log entries as they are ingested by Cloud Logging. This is ideal for monitoring a running Compute Engine instance without needing to SSH into it. Option C is correct because the `gcloud logging tail` command streams log entries from Cloud Logging in real time, using the Logging API's tail method, and can filter by resource type (e.g., `gce_instance`) or log name.
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.
✓
Using the Logs Explorer's 'Stream logs' feature
Why this is correct
Correct: the Logs Explorer provides a streaming view.
Related concept
Read the scenario before looking for a memorised answer.
✗
Using gcloud compute ssh and running journalctl -f
Why it's wrong here
This manually tails system logs, not Cloud Logging entries.
✓
Using gcloud logging tail
Why this is correct
Correct: streams log entries in real time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Using Cloud Monitoring's metrics explorer
Why it's wrong here
Metrics explorer shows metric charts, not raw logs.
✗
Using gcloud app logs tail
Why it's wrong here
This command is for App Engine, not Compute Engine.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between streaming logs from the centralized Cloud Logging service versus streaming logs directly from the VM's local journal, and candidates mistakenly choose `journalctl -f` (Option B) because they think it provides the same real-time view, but it does not integrate with Cloud Logging's centralized filtering and retention.
Trap categories for this question
Command / output trap
Metrics explorer shows metric charts, not raw logs.
Detailed technical explanation
How to think about this question
The `gcloud logging tail` command uses the Cloud Logging API's `TailLogEntries` method, which establishes a long-lived gRPC or HTTP/2 connection to stream log entries as they are ingested, with sub-second latency. The Logs Explorer's 'Stream logs' feature similarly polls the Logging API but provides a graphical interface with real-time filtering by resource, severity, or custom query. A subtle behavior is that both methods require the VM to have the `logging.write` scope and the Cloud Logging agent (or Ops Agent) installed to forward logs to Cloud Logging; without the agent, no logs appear in the stream.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
Managing application performance monitoring — This question tests Managing application performance monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Using the Logs Explorer's 'Stream logs' feature — Option A is correct because the Logs Explorer in the Google Cloud Console provides a 'Stream logs' feature that allows you to view real-time log entries as they are ingested by Cloud Logging. This is ideal for monitoring a running Compute Engine instance without needing to SSH into it. Option C is correct because the `gcloud logging tail` command streams log entries from Cloud Logging in real time, using the Logging API's tail method, and can filter by resource type (e.g., `gce_instance`) or log name.
What should I do if I get this PCD 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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Question Discussion
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