title: Elastic Cloud APM Server - Queue is full
body: <p>I have many Java microservices running in a Kubernetes Cluster. All of them are APM agents sending data to an APM server in our Elastic Cloud Cluster.</p>
  <p>Everything was working fine but suddenly every microservice received the error below showed in the logs.</p>
  <p><a href="https://i.stack.imgur.com/QP3bE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QP3bE.png" alt="enter image description here" /></a></p>
  <p>I tried to restart the cluster, increase the hardware power and I tried to follow the <a href="https://www.elastic.co/guide/en/apm/server/6.3/tune-apm-server.html#tune-output-config" rel="nofollow noreferrer">hints</a> but no success.</p>
  <p>Obs: The disk is almost empty and the memory usage is ok.
  Everything is in 7.5.2 version</p>