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Setting up a logger is something that pretty much every entrypoint needs to do, be it a test, a shared library embedded in another app or a standalone application. Thus, it makes sense to introduce a dedicated crate that allows us to bundle all the things together, how we want to do logging. This allows us to introduce convenience functions like `firezone_logging::test` which allow you to construct a logger for a test as a one-liner. Crucially though, introducing `firezone-logging` gives us a place to store a default log directive that silences very noisy crates. When looking into a problem, it is common to start by simply setting the log-filter to `debug`. Without further action, this floods the output with logs from crates like `netlink_proto` on Linux. It is very unlikely that those are the logs that you want to see. Without a preset filter, the only alternative here is to explicitly turn off the log filter for `netlink_proto` by typing something like `RUST_LOG=netlink_proto=off,debug`. Especially when debugging issues with customers, this is annoying. Log filters can be overridden, i.e. a 2nd filter that matches the exact same scope overrides a previous one. Thus, with this design it is still possible to activate certain logs at runtime, even if they have silenced by default. I'd expect `firezone-logging` to attract more functionality in the future. For example, we want to support re-loading of log-filters on other platforms. Additionally, where logs get stored could also be defined in this crate. --------- Signed-off-by: Thomas Eizinger <thomas@eizinger.io> Co-authored-by: Reactor Scram <ReactorScram@users.noreply.github.com>