/profile=full-ha/subsystem=io/worker=default:read-resource(include-runtime)
{
    "outcome" => "success",
    "result" => {
        "io-threads" => "WFLYIO006: no metrics available",
        "stack-size" => "WFLYIO006: no metrics available",
        "task-keepalive" => "WFLYIO006: no metrics available",
        "task-max-threads" => "WFLYIO006: no metrics available",
        "server" => undefined
    }
}

/subsystem=io/worker=test123:add(io-threads=11,stack-size=12,task-keepalive=13,task-max-threads=14)
{"outcome" => "success"}
[standalone@localhost:9990 /] /subsystem=io/worker=test123:read-resource
{
    "outcome" => "success",
    "result" => {
        "io-threads" => undefined,
        "stack-size" => undefined,
        "task-keepalive" => undefined,
        "task-max-threads" => undefined,
        "server" => undefined
    }
}