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Implement an instrumentation strategy →hardMultiple ChoiceObjective-mapped

AZ-400 Implement an instrumentation strategy Practice Question

This AZ-400 practice question tests your understanding of implement an instrumentation strategy. 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.

Exhibit

Refer to the exhibit.

```json
{
  "apiVersion": "microsoft.insights/v1",
  "location": "eastus",
  "properties": {
    "dataFlows": [
      {
        "destinations": ["la-workspace"],
        "streams": ["Microsoft-InsightsMetrics"]
      }
    ],
    "dataSources": {
      "performanceCounters": [
        {
          "name": "cpuCounter",
          "counterSpecifiers": [
            "\\Processor(_Total)\\% Processor Time"
          ],
          "samplingFrequencyInSeconds": 60
        }
      ]
    },
    "destinations": {
      "logAnalytics": [
        {
          "workspaceResourceId": "/subscriptions/sub-id/resourceGroups/rg/providers/Microsoft.OperationalInsights/workspaces/myworkspace"
        }
      ]
    }
  }
}
```

You are reviewing a Data Collection Rule (DCR) for an Azure virtual machine. The DCR is assigned to the VM, and the Azure Monitor Agent is installed. After one hour, no performance data appears in the Log Analytics workspace. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1hardmultiple choice
Full question →

Exhibit

Refer to the exhibit.

```json
{
  "apiVersion": "microsoft.insights/v1",
  "location": "eastus",
  "properties": {
    "dataFlows": [
      {
        "destinations": ["la-workspace"],
        "streams": ["Microsoft-InsightsMetrics"]
      }
    ],
    "dataSources": {
      "performanceCounters": [
        {
          "name": "cpuCounter",
          "counterSpecifiers": [
            "\\Processor(_Total)\\% Processor Time"
          ],
          "samplingFrequencyInSeconds": 60
        }
      ]
    },
    "destinations": {
      "logAnalytics": [
        {
          "workspaceResourceId": "/subscriptions/sub-id/resourceGroups/rg/providers/Microsoft.OperationalInsights/workspaces/myworkspace"
        }
      ]
    }
  }
}
```

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

✓

The data flow streams property does not include 'Microsoft-Perf'.

The most likely cause is that the data flow streams property in the DCR does not include 'Microsoft-Perf'. The Azure Monitor Agent uses DCRs to define which data to collect and where to send it. Without the 'Microsoft-Perf' stream specified in the dataFlows section, performance counters are not collected, even if the counter specifiers are correctly defined. The workspace resource ID and counter format may be correct, but the missing stream prevents any performance data from being ingested.

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.

  • ✗

    The workspace resource ID is incorrectly formatted.

    Why it's wrong here

    The resource ID appears correctly formatted.

  • ✓

    The data flow streams property does not include 'Microsoft-Perf'.

    Why this is correct

    Performance counters require the 'Microsoft-Perf' stream in the data flow.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    The counter specifier uses the wrong format for Windows performance counters.

    Why it's wrong here

    The format '\\Processor(_Total)\\% Processor Time' is correct for Windows.

  • ✗

    The sampling frequency of 60 seconds is too low and data is being throttled.

    Why it's wrong here

    60 seconds is a valid sampling interval.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates focus on the counter specifier format or sampling frequency, overlooking the critical data flow stream property which is the actual pipeline that enables data ingestion.

Detailed technical explanation

How to think about this question

Under the hood, the Azure Monitor Agent (AMA) reads the DCR JSON and uses the dataFlows array to map data sources (like performance counters) to output streams (like 'Microsoft-Perf'). Each stream corresponds to a specific table in Log Analytics (e.g., 'Microsoft-Perf' maps to the 'Perf' table). If the stream is missing, the agent's data pipeline simply discards the performance counter data because it has no destination. In real-world scenarios, this is a common misconfiguration when copying DCRs from templates without adjusting the streams to match the intended data types.

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.

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FAQ

Questions learners often ask

What does this AZ-400 question test?

Implement an instrumentation strategy — This question tests Implement an instrumentation strategy — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The data flow streams property does not include 'Microsoft-Perf'. — The most likely cause is that the data flow streams property in the DCR does not include 'Microsoft-Perf'. The Azure Monitor Agent uses DCRs to define which data to collect and where to send it. Without the 'Microsoft-Perf' stream specified in the dataFlows section, performance counters are not collected, even if the counter specifiers are correctly defined. The workspace resource ID and counter format may be correct, but the missing stream prevents any performance data from being ingested.

What should I do if I get this AZ-400 question wrong?

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

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Last reviewed: Jun 11, 2026

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This AZ-400 practice question is part of Courseiva's free Microsoft 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 AZ-400 exam.