Function init_tracing 

pub fn init_tracing() -> Result<()>

Initializes a tracing subscriber for external Rust crate logging.

This sets up a standard tracing subscriber that outputs to stdout with the format controlled by RUST_LOG environment variable. The output format uses nanosecond timestamps to align with Nautilus logging.

Environment Variables

• RUST_LOG: Controls which modules emit tracing events and at what level.
  • Example: RUST_LOG=hyper=debug,tokio=warn.
  • Default: warn (if not set).

Errors

Returns an error if the tracing subscriber has already been initialized.