The answer is Azure Application Insights, which is the correct Azure service for distributed tracing across microservices. This service enables developers to track a single request as it flows through multiple components, using a correlation ID to link telemetry from each service and pinpoint exactly where performance bottlenecks or failures occur. On the AZ-900 exam, this question tests your understanding of Azure Monitor’s ecosystem, specifically how Application Insights provides end-to-end transaction diagnostics—a concept often confused with Azure Monitor itself, which is the broader monitoring platform. A common trap is selecting Azure Service Health or Azure Traffic Manager, but remember: Application Insights is the only service that correlates traces across microservices with distributed tracing. For a quick memory tip, think “App Insights = App Traces,” linking the service name directly to its core function of tracing application requests across distributed systems.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
Which Azure service provides distributed tracing across microservices to help developers identify performance bottlenecks and failures?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Application Insights
Azure Application Insights is the correct service because it provides distributed tracing, which allows developers to track requests as they travel across multiple microservices. This capability helps identify performance bottlenecks and failures by correlating telemetry from different components, using a correlation ID to link operations. It is part of Azure Monitor and supports OpenTelemetry for standardized instrumentation.
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.
✗
Azure Log Analytics
Why it's wrong here
Log Analytics stores and queries logs but doesn't provide built-in distributed tracing and correlation across microservices.
✓
Azure Application Insights
Why this is correct
Application Insights provides distributed tracing with end-to-end correlation across microservices, enabling bottleneck identification.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Monitor Metrics
Why it's wrong here
Monitor Metrics tracks numeric performance data points but doesn't trace individual requests across microservices.
✗
Azure Sentinel
Why it's wrong here
Microsoft Sentinel is a SIEM/SOAR for security operations, not application performance tracing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Monitor Metrics (which shows performance counters) with Application Insights (which provides distributed tracing), or they mistakenly think Log Analytics alone can correlate cross-service requests without the built-in trace context propagation.
Detailed technical explanation
How to think about this question
Distributed tracing in Application Insights uses a trace context propagation mechanism, often based on the W3C Trace-Context standard, where each request carries a trace ID and span ID. Under the hood, the SDK instruments HTTP calls, database queries, and message queues to create a dependency map, enabling developers to visualize latency contributions per service. In a real-world scenario, a microservices-based e-commerce app can use this to pinpoint that a checkout failure is due to a slow payment gateway call, not the frontend.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Application Insights — Azure Application Insights is the correct service because it provides distributed tracing, which allows developers to track requests as they travel across multiple microservices. This capability helps identify performance bottlenecks and failures by correlating telemetry from different components, using a correlation ID to link operations. It is part of Azure Monitor and supports OpenTelemetry for standardized instrumentation.
What should I do if I get this AZ-900 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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