title: fragment/analytics/common
description: Common fields for all WMF analytics and instrumentation events
$id: /fragment/analytics/common/2.0.0
$schema: https://json-schema.org/draft-07/schema#
type: object
additionalProperties: false
# Use allOf so that common schemas are fully merged by
# jsonschema-tools along with their required fields.
allOf:
  ### These are from schemas/event/primary repository
  - $ref: /fragment/common/1.0.0#
  - $ref: /fragment/http/1.2.0#
properties:
  dt:
    type: string
    format: date-time
    maxLength: 128
    description: >
      ISO-8601 formatted timestamp of when the event occurred/was generated
      in UTC). This exists separately from meta.dt in the main common
      schema. For external client-sent instrumentation events, we want to
      allow meta.dt to be the received time (filled in by EventGate at
      ingest time), as we don't trust client-sent events to always set the
      proper date and time. Client-set event generation time should be set
      here instead. See: https://phabricator.wikimedia.org/T240460