At the moment the subsystem is still not complete and the various modules
do not yet produce traces (some dirty experimental code for H2 exists) but
this aims at easing a broad adoption.
Among the missing elements, we can enumerate the lack of configuration
of the sinks (e.g. it's still not possible to change their output format
nor enable/disable timestamps) and since timestamps are not availalbe in
the sinks, they are not collected nor passed by the traces.
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