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If Prometheus receives a 404 error when scraping /actuator/prometheus from a Spring Boot app, what is the most probable misconfiguration?

medium📝 Troubleshoot Q6 of 15

Spring Boot - Actuator

If Prometheus receives a 404 error when scraping /actuator/prometheus from a Spring Boot app, what is the most probable misconfiguration?

APrometheus server is down and cannot reach the Spring Boot app

BThe Prometheus endpoint is not enabled or exposed in Spring Boot actuator settings

CThe Spring Boot app is missing the database connection

DGrafana is not connected to Prometheus

Step-by-Step Solution

Solution:

Step 1: Understand 404 on /actuator/prometheus
A 404 means the endpoint is not found or not exposed.
Step 2: Check Spring Boot actuator config
The Prometheus endpoint must be enabled and included in management.endpoints.web.exposure.include.
Final Answer:
The Prometheus endpoint is not enabled or exposed in Spring Boot actuator settings -> Option B
Quick Check:
Server down or Grafana issues cause different errors, not 404 [OK]

Quick Trick: 404 means endpoint missing or not exposed [OK]

Common Mistakes:

Assuming Prometheus server is down causes 404
Confusing Grafana connection issues with scraping errors
Thinking database issues cause scraping 404

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