The error message explains better when using the --socket option incorrectly.

STR:

1. Try to add MySQL with specifying socket and port:

   [ec2-user@ip-10-178-2-129 ~]$ pmm-admin add mysql --cluster=pxc --username=root --socket=--socket=/tmp/PXC_NODE_3.sock --port=1722  PXC_3 

   Given result:

   both socket and address are passed

   The same error message is returned while using both socket and address
   Expected result:

    Both socket and port cannot be specified