=== level filtering ===
enter(error-span)
enter(info-span)
msg(warn-msg)
=== manual enter/exit ===
enter(manual)
exit
=== exception safety ===
enter(risky)
exit
=== no collector ===
ok
=== double setup ===
caught: trace: collector already present
=== metrics ===
metric(my_int,42)
metric(my_float,3.14)
=== with_setup_collector exception safety ===
shutdown called: true