remote_id:long()
This function returns a number 0..N, which is the unique index of this particular script execution from a swarm of lqstap --remote A --remote B ...rq runs, and is the same number lqstap --remote-prefixrq would print. The function returns -1 if the script was not launched with lqstap --remoterq, or if the remote staprun/stapsh are older than version 1.7.