Spring Boot Actuator

• It consist of production ready, feature to monitor and manage your application.
• We can monitor and manage our application.
• We can choose to manage and monitor our application using HTTP end points or with JMX.
• Auditing, health and Matrix gathering can also be automatically applied to our application.
• Actuator helps to refresh the micro service without restarting it with any changes to its properties file.
• We use URL /actuator/refresh(POST)
• When we hit refresh URL of actuator, it updates, the configuration of that micro service.
• Micro service fetches latest configuration again from properties file.
• If we have multiple instances for a micro service running, then it will only refresh that instance from which Call is being made. This is the drawback of actuator and to overcome this drawback, we use spring cloud bus.
• The other instances of micro service will not get updated and will remain same.
• Actuator Configuration
• https://github.com/gauravmatta/springmvc/blob/1e8408dcd02e53b54c3cbae3dd1cd20f9874e5f9/currency-service/src/main/resources/application.properties
• Creating Custom Health Checks
• https://github.com/gauravmatta/springmvc/blob/1e8408dcd02e53b54c3cbae3dd1cd20f9874e5f9/currency-service/src/main/java/com/springimplant/currencyservice/service/HealthService.java
• https://github.com/gauravmatta/springmvc/blob/1e8408dcd02e53b54c3cbae3dd1cd20f9874e5f9/currency-service/src/main/java/com/springimplant/currencyservice/service/impl/KafkaHealthServiceImpl.java