AZ-204 Practice Question: Monitor, troubleshoot, and optimize Azure solutions
A developer needs to run a Kusto query against application request data to identify 95th percentile latency by operation. Where should the query be run?
⚠ Common exam trap
Test-takers frequently confuse Azure Resource Graph with Log Analytics, but Resource Graph only queries Azure resource properties and configurations, not application telemetry data.
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
✓
Logs in Application Insights or the associated Log Analytics workspace
Application Insights stores application request data, including latency metrics, and supports Kusto queries via its Logs blade. The associated Log Analytics workspace also provides the same query capabilities, making it the correct location to run a Kusto query for 95th percentile latency by operation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Logs in Application Insights or the associated Log Analytics workspace
Why this is correct
Application Insights request telemetry is stored in Logs, queryable through the Application Insights Logs blade or the linked Log Analytics workspace. Kusto queries such as percentile() over requests by operation run there, satisfying the 95th-percentile latency requirement.
- ✗
Microsoft Entra audit logs
Why it's wrong here
Microsoft Entra audit logs record directory activities such as sign-ins, role assignments, and application changes; they hold no request latency or operation-level performance data. Application Insights request telemetry, queried via KQL in Log Analytics, provides the 95th percentile by operation. Entra audit logs suit identity compliance investigations.
- ✗
Azure Key Vault diagnostic settings
Why it's wrong here
Key Vault diagnostic settings emit audit events about secret, key, and certificate access to Log Analytics or storage; they contain no application request telemetry. Application Insights, which stores request data in Log Analytics, is where such KQL percentile queries run. Key Vault diagnostics would be correct for auditing vault access patterns.
- ✗
Azure Resource Graph only
Why it's wrong here
Azure Resource Graph queries resource configuration and metadata across subscriptions, not application request telemetry, so percentile latency by operation cannot be computed there. Application Insights stores request data in Log Analytics, where KQL percentile queries run. Resource Graph is correct for inventory and compliance queries over Azure resources.
Go deeper
Related to this question
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Azure Monitor for Application Developers
Key term
Application Insights
Application Insights is an Azure monitoring service that helps developers detect, diagnose, and understand issues in live web applications by collecting telemetry data like requests, exceptions, and performance counters.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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