ambari/ambari-web/app/assets/data/stack_versions/upgrades.json

{
  "href": "http://c6401.ambari.apache.org:8080/api/v1/clusters/c/upgrades?fields=Upgrade/request_status,Upgrade/to_version,Upgrade/request_id,Upgrade/direction",
  "items": [
    {
      "href": "http://c6401.ambari.apache.org:8080/api/v1/clusters/c/upgrades/19",
      "Upgrade": {
        "cluster_name": "c",
        "direction": "UPGRADE",
        "request_id": 19,
        "request_status": "COMPLETED",
        "to_version": "2.2.3.0-2610"
      }
    }
  ]
}