rpc_pubsub_max_connections

raw details (from release v2.2.3):

{
  "name": "rpc_pubsub_max_connections",
  "long": "rpc-pubsub-max-connections",
  "value_name": "NUMBER",
  "takes_value": "true",
  "validator": "is_parsable::<usize>",
  "help": "\"The maximum number of connections that RPC PubSub will support. This is a \\ hard limit and no new connections beyond this limit can be made until an old \\ connection is dropped.\""
}