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---
- name: tracing
  title: Tracing
  root: true
  group: 2
  short: Fields related to distributed tracing.
  description: >
    Distributed tracing makes it possible to analyze performance throughout a microservice architecture all in one view.
    This is accomplished by tracing all of the requests - from the initial web
    request in the front-end service - to queries made through multiple back-end services.

    Unlike most field sets in ECS, the tracing fields are *not* nested under the
    field set name. In other words, the correct field name is `trace.id`,
    not `tracing.trace.id`, and so on.
  type: group
  fields:
    - name: trace.id
      level: extended
      type: keyword
      example: 4bf92f3577b34da6a3ce929d0e0e4736
      short: Unique identifier of the trace.
      description: >
        Unique identifier of the trace.

        A trace groups multiple events like transactions that belong together.
        For example, a user request handled by multiple inter-connected services.

    - name: transaction.id
      level: extended
      type: keyword
      example: 00f067aa0ba902b7
      short: Unique identifier of the transaction within the scope of its trace.
      description: >
        Unique identifier of the transaction within the scope of its trace.

        A transaction is the highest level of work measured within a service, such as a request to a server.

    - name: span.id
      level: extended
      type: keyword
      example: 3ff9a8981b7ccd5a
      short: Unique identifier of the span within the scope of its trace.
      description: >
        Unique identifier of the span within the scope of its trace.

        A span represents an operation within a transaction, such as a request to another service, or a database query.