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Previously we could only configure one global tracing filter that
applied to stdout and journald. There was no support for log files,
either.
This patch fixes both issues, by substantially revising the
configuration format: There are now separate filters for each log
file, for journald, and for the console log. Because we want to
allow multiple logfiles, they have to go into an array in the
configuration.
The configuration logic has grown a bit complicated in its types,
since the tracing_subscriber crate would prefer to have the complete
structure of tracing Layers known statically. That's fine when you
know how many you have, and which kinds there will be, but for
the runtime-configuration case we need to mess around with
`Box<dyn Layer ...>`.
I also had to switch from tracing_subscriber's EnvFilter to its
Targets filter. It seems "EnvFilter" can only be applied as a Layer
in itself, and won't work as a Filter on an individual Layer.
Closes #166.
Closes #170.
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