groups:
  - id: attributes.messaging.common.minimal
    type: attribute_group
    brief: "Common cross-signal messaging attributes."
    attributes:
      # TODO: Not adding `messaging.system` to the minimal because of https://github.com/open-telemetry/build-tools/issues/192
      - ref: error.type
        examples: ['amqp:decode-error', 'KAFKA_STORAGE_ERROR', 'channel-error']
        requirement_level:
          conditionally_required: If and only if the messaging operation has failed.
      - ref: server.address
        note: >
          Server domain name of the broker if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name.
        requirement_level:
          conditionally_required: If available.
      - ref: server.port
      - ref: messaging.operation.name
        requirement_level: required