groups:
  - id: log-exception
    type: attribute_group
    brief: >
      This document defines attributes for exceptions represented using Log
      Records.
    attributes:
      - ref: exception.type
        requirement_level:
          conditionally_required: Required if `exception.message` is not set, recommended otherwise.
      - ref: exception.message
        requirement_level:
          conditionally_required: Required if `exception.type` is not set, recommended otherwise.
      - ref: exception.stacktrace