xapiapps doesn’t currently send statements directly about metrics. However, it does include this information in statements generated for xAPI statements for an individual question from an assessment / checklist. It is included under context.contextActivities.other for the xAPI statement generated for the activity.

Here is an example snippet from a self assessment activity:

{
  "context": {
    "contextActivities": {
      "other": [{
          "id": "https://vivcao-dot-tes-dev-vc-core.appspot.com/xapi/def/tags/00964efc-589a-a14f-4b59-aff6827970f5",
          "definition": {
              "name": {
                  "en-US": "Marketing metric"
               },
               "type": "http://id.tincanapi.com/activitytype/tag"
           },
           "objectType": "Activity"
         },
         ...
      ],
      ...
    },
    ...
  },
  ...
}