pub fn init()Expand description
Initialize the logging system.
Uses the RUST_LOG environment variable for filtering. If not set,
defaults to shell_tunnel=info.
Diagnostics go to stderr, which leaves stdout for the things a caller wants
to read: the public URL, the API key, the command to try. Sharing one stream
means shell-tunnel --tunnel | grep "Public URL" picks up log lines instead.
ยงPanics
Panics if called more than once, or if another tracing subscriber has already been set.