Set of standard attribute names published by the OpenTelemetry project. Do not require installing the OpenTelemetry SDK — they are purely naming conventions (e.g. messaging.destination.name for a queue name, because OTel models background jobs as a messaging protocol alongside Kafka and RabbitMQ). Adopting them in structured logs makes data portable between observability vendors and aligns teams on shared attribute names. Callaghan notes the Ruby OTel library is not yet mature enough for production, but the conventions can be adopted independently.