Logging data model

The data model of logs is an extension of emit's events. Log events include the following well-known properties:

• lvl: a severity level assigned to the event.
  • "debug": a weakly informative event for live debugging.
  • "info": an informative event.
  • "warn": a weakly erroneous event for non-critical operations.
  • "error": an erroneous event.
• err: an error associated with the event.

There's some overlap between the logs data model and other extensions. Span events, for example, also support attaching levels and errors through lvl and err.