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<div><h1 class="title"><a id="id-1"></a>Why is APM Server a separate component?</h1><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/6.3/docs/overview.asciidoc">edit</a></div>
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<div class="position-relative"><h2 class="title"><a id="why-separate-component"></a>Why is APM Server a separate component?</h2><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/6.3/docs/overview.asciidoc">edit</a></div>
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<p>The APM Server is kept as a separate component for the following reasons:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
It helps keep the agents as light as possible and since the APM Server is a stateless separate component,
it can be scaled independently.
</li>
<li class="listitem">
For real-user-monitoring (beta),
data is being collected in agents running in browsers.
APM Server prevents browsers from interacting directly with Elasticsearch (which poses a security risk),
and controls the amount of data flowing into Elasticsearch.
</li>
<li class="listitem">
In cases where Elasticsearch becomes unresponsive,
APM Server can buffer data temporarily (configurable) without adding overhead to the agents.
</li>
<li class="listitem">
APM Server serves as a middleware for source mapping for javascript in the browser.
</li>
<li class="listitem">
The APM Server provides a JSON API for agents to use thereby improving compatibility across different versions of agents and the Elastic Stack.
</li>
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