logging

Structured logging in Go uses key-value fields to add context to log entries, making them easier to query and filter. It is needed when you require clear operator-facing information and developer-focused debugging across packages and handlers.

To avoid duplicate error logs in Go, follow the golden rule of error logging: do not log an error and then return it from the same function. Propagate errors up the call stack and log them only at the terminal or top-level handler.

Best practices for Go log levels dictate using only two primary levels: Info for operators to monitor application state, and Debug for developers to trace internal execution. This minimalist approach reduces log noise and focuses on meaningful events.

Implement contextual logging by attaching structured fields to your logs within HTTP handlers and background workers. This provides specific request or task details, ensuring the logs deliver actionable context without duplicate entries.

Differentiate between terminal and mid-stack logging when placing log statements in Go. Log terminal errors at the top level where they are handled, and use mid-stack logs sparingly for debug-level tracing to avoid duplication.