refactor(tvix/tracing): simplify flushing channel r/8942

The TracingHandle::flush function allowed a user to pass in their
own (optional) oneshot::Sender<()> to get notified once the flush is
completed, but that's making things unnecessary complicated.

By simply having the flush() function await the flush, we make its
interface more intuitive, and callsites (only inside tvix-tracing itself
so far) simpler.

We can also remove the Option around the oneshot::Sender entirely, as we
now always call it with that.

For some more clarity, we can remove the channel from the struct fields
entirely if otlp support isn't compiled in.

Change-Id: I0870b9e8e88c6be6494a9c201c1c70b87e0f0810
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12801
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: Marijan Petričević <marijan.petricevic94@gmail.com>
Tested-by: BuildkiteCI

0 files changed, 0 insertions, 0 deletions