- A
Query the Heartbeat table, because it stores the heartbeat records for Azure VMs.
Heartbeat is the log source that records the VM check-in data required for this troubleshooting query.
- B
Summarize max(TimeGenerated) by Computer to get the most recent heartbeat per VM.
Summarizing the maximum timestamp per computer produces the latest heartbeat time needed for comparison.
- C
Join the results to AzureActivity to calculate service health.
Why wrong: AzureActivity tracks control-plane operations, not VM heartbeat timestamps, so it is not needed here.
- D
Filter where TimeGenerated is older than 20 minutes before summarizing.
Why wrong: Filtering rows first can drop newer heartbeat records and prevent the query from finding the latest check-in correctly.
- E
Use the Perf table because it stores heartbeat timestamps.
Why wrong: Perf contains performance counters, not the heartbeat records that show whether a VM has checked in recently.
AZ-104 Monitor and Maintain Azure Resources Practice Question
This AZ-104 practice question tests your understanding of monitor and maintain azure resources. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 help desk analyst needs a KQL query that identifies each VM's most recent heartbeat so computers can be flagged if their last check-in is older than 20 minutes. Which two KQL elements should be used? Select two.
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
Query the Heartbeat table, because it stores the heartbeat records for Azure VMs.
Option A is correct because the Heartbeat table in Azure Monitor Logs (Log Analytics) is specifically designed to store heartbeat records from Azure Monitor Agent (AMA) or the legacy Log Analytics agent. Each heartbeat record contains a TimeGenerated timestamp, making it the authoritative source for determining when a VM last reported its health status.
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.
- ✓
Query the Heartbeat table, because it stores the heartbeat records for Azure VMs.
Why this is correct
Heartbeat is the log source that records the VM check-in data required for this troubleshooting query.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Summarize max(TimeGenerated) by Computer to get the most recent heartbeat per VM.
Why this is correct
Summarizing the maximum timestamp per computer produces the latest heartbeat time needed for comparison.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Join the results to AzureActivity to calculate service health.
Why it's wrong here
AzureActivity tracks control-plane operations, not VM heartbeat timestamps, so it is not needed here.
- ✗
Filter where TimeGenerated is older than 20 minutes before summarizing.
Why it's wrong here
Filtering rows first can drop newer heartbeat records and prevent the query from finding the latest check-in correctly.
- ✗
Use the Perf table because it stores heartbeat timestamps.
Why it's wrong here
Perf contains performance counters, not the heartbeat records that show whether a VM has checked in recently.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly think filtering before summarizing is more efficient, but doing so removes the very data needed to identify the most recent heartbeat, leading to incorrect results.
Trap categories for this question
Command / output trap
Perf contains performance counters, not the heartbeat records that show whether a VM has checked in recently.
Detailed technical explanation
How to think about this question
The Heartbeat table is populated by agents every 1–5 minutes by default, with the TimeGenerated field reflecting the exact UTC timestamp of the agent's last report. Using summarize max(TimeGenerated) by Computer collapses multiple heartbeat rows per VM into a single latest timestamp, which can then be compared against the current time (e.g., using now() - 20m) to flag VMs that have not checked in within the threshold. A common real-world scenario is monitoring hybrid VMs or Azure Arc-enabled servers where heartbeat gaps may indicate network issues or agent failures.
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
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Monitor and Maintain Azure Resources — This question tests Monitor and Maintain Azure Resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Query the Heartbeat table, because it stores the heartbeat records for Azure VMs. — Option A is correct because the Heartbeat table in Azure Monitor Logs (Log Analytics) is specifically designed to store heartbeat records from Azure Monitor Agent (AMA) or the legacy Log Analytics agent. Each heartbeat record contains a TimeGenerated timestamp, making it the authoritative source for determining when a VM last reported its health status.
What should I do if I get this AZ-104 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 11, 2026
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