One of the important aspects of any application is the logs. Analyzing any problem becomes very easy when appropriate logs are used. Hence, here we have a centralized logger microservice that is based on the famous Elastic framework. Logstash watches for log files and transforms them into appropriate JSON before pushing to Elasticsearch. We can visualize the logs through the Kibana dashboard. Each microservice will have its unique UUID or some log pattern configured. We will look at this in much more detail in Chapter 9, Deployment, Logging, and Monitoring.