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You added Spring Boot Actuator but get a 404 error when accessing '/actuator/metrics'. What is the most likely cause?

medium📝 Troubleshoot Q6 of 15

Spring Boot - Actuator

You added Spring Boot Actuator but get a 404 error when accessing '/actuator/metrics'. What is the most likely cause?

AThe metrics endpoint is deprecated and removed

BThe 'management.endpoints.web.exposure.include' property does not include 'metrics'

CThe application is missing the Spring Web dependency

DThe actuator endpoints require a database connection

Step-by-Step Solution

Solution:

Step 1: Check endpoint exposure settings
By default, only some endpoints are exposed; 'metrics' must be included.
Step 2: Exclude unrelated causes
Web dependency is usually present; metrics endpoint is not deprecated; no DB needed.
Final Answer:
The 'management.endpoints.web.exposure.include' property does not include 'metrics' -> Option B
Quick Check:
404 cause = C [OK]

Quick Trick: Expose endpoints explicitly to avoid 404 errors [OK]

Common Mistakes:

Assuming metrics endpoint is removed
Thinking database is required for metrics
Ignoring endpoint exposure configuration

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