Not all processes are supervised

[alco]

We're currently seeing this picture in Observer

even though there are lots of exometer probes running.

I have found a handful of spawn calls in the code:

λ ag 'spawn\('
src/exometer_proc.erl
32:%% Use plain_fsm:spawn()
76:    proc_lib:spawn(fun() ->

src/exometer_report.erl
1404:    Pid = proc_lib:spawn(Fun),

Is there any reason those are not spawn_link calls?