message: Fix the criteria definition
diff: ],
  "properties": {
  "criteria": {
  - "$ref": "#/definitions/Criteria",
  - "description": "Severity of the alert"
  + "type": "array",
  + "items": {
  + "$ref": "#/definitions/Criteria"
  + },
  + "description": "Criteria of Metric"
  }
  },
  "required": [
  