Apply these conventions when working with pino logging code.

Logger Creation

Create with pino(options, destination). Both arguments are optional.
Key options: level (default 'info'), name, base (default {pid, hostname} — set to undefined to omit), timestamp (default true), messageKey (default 'msg'), errorKey (default 'err').
Use enabled: false to disable logging entirely (e.g., in tests).
Use nestedKey to namespace logged objects and avoid key collisions with the log envelope.

Log Levels

Built-in levels: trace (10), debug (20), info (30), warn (40), error (50), fatal (60), silent (Infinity).
Method signature: logger.info([mergingObject], [message], [...interpolationValues]).
Pass the object first, message second: logger.info({ userId: 123 }, 'user logged in') — not the other way around.
Check level before expensive work: if (logger.isLevelEnabled('debug')) { ... }.
Custom levels: customLevels: { audit: 35 }. Use useOnlyCustomLevels: true to disable built-in levels.