1. Logging
    1. Getting started with logging in Rust
    2. Simple Logger new
      1. Simple Logger new
      2. Simple Logger init
      3. Simple Logger level
    3. Logging with log4rs
    4. env_logger
      1. env_logger in a simpl way
      2. env_logger with Builder
  2. Tracing
    1. Tracing demo
    2. Tracing in a library
    3. Tracing in an application
    4. Simple tracing configuration with RUST_LOG environment variable