Previously, enabling the `tracing_flame` or `allow_jaeger` options would
prevent any logs from being written to stdout. In addition, enabling the
`allow_jaeger` option would inhibit the `tracing_flame` option.
Now that we have a way to use separate tracing filters with different
layers, we can enable all three at the same time without issues.
This commit also prevents the `debug log_level` command from modifying
the `tracing-flame` filter. This was supported previously, but I don't
think it's something that you would ever want to do intentionally. Now
that we have both the normal log filter and the `tracing-flame` filter
enabled at the same time, we want to `debug log_level` to only modify the
normal filter.
This turned out to be quite hairy, mostly because we need to apply the
config's log level filter to the actual logs (stdout and, optionally
sentry), but do not want to filter out the tokio tracing events needed by
the console_subscriber. I hit several edge cases in tracing getting
this to work, and we now depend on a git version of tracing with a
backported patch :(
Benjamin Lee