How TCP connections are managed in case of akka remote communication

Akka Akka Cluster
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I was going through the documentation but could not find details around how TCP connections are managed when akka remoting/cluster is enabled with the following setting

 akka.remote.artery.transport = tcp

When a message is sent to a remote actor, these go over TCP. Creating a new TCP connection on every remote message would be very expensive and I am sure Akka remoting must be using shared connection pool somewhere in case of artery TCP. I would like to know, who and how these connections are managed. Is there any documentation around this that I can read?

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The connections are opened on demand when a message is sent. It stays open but is closed automatically if no messages are sent to that node within the configured akka.remote.artery.advanced.stop-idle-outbound-after.

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