Why is APM Server a separate component?edit

The APM Server is a separate component for the following reasons:

  • It helps to keep the agents as light as possible.
  • Since the APM Server is a stateless separate component, it can be scaled independently.
  • Data is collected in browsers for Real User Monitoring. APM Server prevents these browsers from interacting directly with Elasticsearch (which poses a security risk).
  • APM Server controls the amount of data flowing into Elasticsearch.
  • In cases where Elasticsearch becomes unresponsive, APM Server can buffer data temporarily without adding overhead to the agents.
  • Acts as a middleware for source mapping for JavaScript in the browser.
  • Provides a JSON API for agents to use and thereby improves compatibility across different versions of agents and the Elastic Stack.