b. Microservices

Each microservice needs two changes: the required Maven dependencies in pom.xml and the actuator endpoint configuration in application.yaml.

1 Dependencies

Add the following dependencies to the pom.xml of each microservice (gateway-service, auth-service, and account-service):

<!-- metrics collection -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

<!-- export in prometheus format -->
<dependency>
    <groupId>io.micrometer</groupId>
    <artifactId>micrometer-registry-prometheus</artifactId>
    <scope>runtime</scope>
</dependency>

• spring-boot-starter-actuator enables production-ready management endpoints, including health checks and metrics.
• micrometer-registry-prometheus exports those metrics in the text format that Prometheus expects to scrape.

2 Configuration

Configure each service's application.yaml to expose the Prometheus endpoint under the service's own context path. This keeps all endpoints reachable through the single load balancer port without conflicts:

management:
  endpoints:
    web:
      base-path: /gateway/actuator
      exposure:
        include: ['prometheus']

spring:
  cloud:
    gateway:
      metrics:
        enabled: true

management:
  endpoints:
    web:
      base-path: /auth/actuator
      exposure:
        include: ['prometheus']

management:
  endpoints:
    web:
      base-path: /accounts/actuator
      exposure:
        include: ['prometheus']