{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "properties": {
    "action_position": {
      "description": "A zero based integer indicating the position of this event",
      "type": "integer"
    },
    "addon_version": {
      "type": "string"
    },
    "browser_session_id": {
      "description": "A mirror of the browser sessionId, as defined in https://github.com/mozilla-services/mozilla-pipeline-schemas/blob/master/schemas/telemetry/main/main.4.schema.json",
      "type": "string"
    },
    "client_id": {
      "pattern": "^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$",
      "type": "string"
    },
    "event": {
      "description": "An event identifier",
      "type": "string"
    },
    "experiments": {
      "additionalProperties": {
        "properties": {
          "branch": {
            "type": "string"
          }
        },
        "type": "object"
      },
      "description": "An object to record all active experiments, experiments IDs are stored as keys, and the value object stores the branch information. Example: {\"experiment_1\": {\"branch\": \"control\"}, \"experiment_2\": {\"branch\": \"treatment\"}}. This deprecates the \"shield_id\" used in activity-stream and messaging-system.",
      "type": "object"
    },
    "locale": {
      "type": "string"
    },
    "page": {
      "enum": [
        "about:newtab",
        "about:home",
        "about:welcome",
        "unknown",
        "n/a",
        "both",
        "https://newtab.firefoxchina.cn/newtab/as/activity-stream.html"
      ],
      "type": "string"
    },
    "profile_creation_date": {
      "type": "integer"
    },
    "region": {
      "type": "string"
    },
    "release_channel": {
      "type": "string"
    },
    "session_id": {
      "description": "A UUID representing an Activity Stream session. This can be used to do table joins between `sessions` and `events` in Activity Stream. Note that `n/a` denotes that the session is not applicable in the context.",
      "pattern": "^\\{[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\\}$|^n/a$",
      "type": "string"
    },
    "shield_id": {
      "description": "[DEPRECATED]: use `experiments` instead. A semicolon separated string to store a list of Shield study IDs",
      "type": "string"
    },
    "source": {
      "type": "string"
    },
    "user_prefs": {
      "description": "An encoded integer representing user's preferences of Activity Stream",
      "type": "integer"
    },
    "value": {
      "description": "A string that describes the context about this event",
      "type": "string"
    },
    "version": {
      "type": "string"
    }
  },
  "required": [
    "client_id",
    "event",
    "addon_version",
    "version",
    "locale"
  ],
  "title": "events",
  "type": "object"
}