The answer is the Azure Activity Log, which is the correct service for reviewing Azure resource changes over the past 90 days because it serves as the primary platform log for all subscription-level control-plane events. This means it captures every create, modify, or delete operation on Azure resources, recording exactly who made the change, what the change was, and when it occurred, with a default retention period of 90 days. On the AZ-900 exam, this question tests your understanding of monitoring and logging services, often appearing as a scenario where you must distinguish the Activity Log from Azure Monitor Metrics or Diagnostic Settings—a common trap is confusing it with resource-level logs, but remember the Activity Log is subscription-wide and control-plane only. A helpful memory tip is to think of it as the “audit trail for your Azure subscription,” tracking the who, what, and when of every resource change.
AZ-900 Describe Azure management and governance Practice Question
This AZ-900 practice question tests your understanding of describe azure management and governance. 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.
An Azure administrator needs to review all changes made to Azure resources over the past 90 days, including who made each change and when. Which Azure service provides this information?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Activity Log
The Azure Activity Log is a platform log in Azure that provides insight into subscription-level events. It records all control-plane operations (e.g., creating, modifying, or deleting resources) and includes details such as who initiated the operation, what the operation was, and when it occurred. The log retains this data for 90 days by default, making it the correct service for reviewing changes over that period.
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 Monitor Metrics
Why it's wrong here
Azure Monitor Metrics tracks performance data (CPU, memory) — not who made changes to resources.
✓
Azure Activity Log
Why this is correct
Activity Log records all control-plane operations on Azure resources including who made changes, when, and the operation performed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Resource Health
Why it's wrong here
Resource Health shows the health status of resources — not a record of changes made.
✗
Azure Policy compliance reports
Why it's wrong here
Policy compliance reports show whether resources comply with policies — not the history of changes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Activity Log with Azure Monitor Metrics, thinking that metrics also track user actions, but metrics are purely performance counters and do not capture identity or operation details.
Trap categories for this question
Command / output trap
Resource Health shows the health status of resources — not a record of changes made.
Detailed technical explanation
How to think about this question
Under the hood, the Activity Log uses the Azure Resource Manager control plane to capture every REST API call (e.g., PUT, POST, DELETE) made to resources, including the caller's Azure AD object ID and timestamp. It supports exporting to Log Analytics or Event Hubs for long-term retention beyond 90 days, and it can be filtered by event category (Administrative, Service Health, Alert, etc.). A real-world scenario is a security audit where an administrator needs to prove that a specific user deleted a virtual machine at 3:00 AM — the Activity Log provides that exact evidence.
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 management and governance — This question tests Describe Azure management and governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Activity Log — The Azure Activity Log is a platform log in Azure that provides insight into subscription-level events. It records all control-plane operations (e.g., creating, modifying, or deleting resources) and includes details such as who initiated the operation, what the operation was, and when it occurred. The log retains this data for 90 days by default, making it the correct service for reviewing changes over that period.
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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