Struct.new(:active, :queued)
Used to represent the number of active and queued sockets for a single listen socket across all threads and processes on a machine.
For TCP listeners, only sockets in the TCP_ESTABLISHED state are accounted for. For Unix domain listeners, only CONNECTING and CONNECTED Unix domain sockets are accounted for.
active connections is the number of accept()-ed but not-yet-closed sockets in all threads/processes sharing the given listener.
queued connections is the number of un-accept()-ed sockets in the queue of a given listen socket.
These stats are currently only available under Linux
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