log

Write events as structured JSON lines to stderr. Will log at the level resolved from: event.level → event.severity → default-level → info. This is a sink (does not emit events downstream).

Config

Optional:

• default-level (trace | debug | info | warn | error | fatal): Default log level if not present in event (default: info)
• extra (object): Additional fields to merge into every log line (event fields take precedence)

Level resolution supports:

• Pino / Bunyan numeric: 10–60 (trace through fatal)
• Syslog numeric: 1–7 (fatal through trace)
• Named strings: trace, debug, info, warn, warning, error, err, fatal

Example

pipeline:
  log:
    inputs: [errors, stats]
    config:
      default-level: warn
      extra:
        env: prod