Health Check

 Problem

When microservice architecture has been implemented, there is a chance that a service might be up but not able to handle transactions. In that case, how do you ensure a request doesn't go to those failed instances? With a load balancing pattern implementation.

Solution

Each service needs to have an endpoint which can be used to check the health of the application, such as /health. This API should o check the status of the host, the connection to other services/infrastructure, and any specific logic.

Spring Boot Actuator does implement a /health endpoint and the implementation can be customized, as well.