{
  "type": "array",
  "items": {
    "type": "object" ,
    "additionalProperties": false,
    "properties": {
      "label": {
        "type": "object",
        "properties": {
          "id": {
            "type": "integer"
          },
          "title": {
            "type": "string"
          },
          "color": {
            "type": "string"
          },
          "text_color": {
            "type": "string"
          }
        }
      },
      "series": {
        "type": "array",
        "items": [
          {
            "type": "array",
            "minItems": 2,
            "maxItems": 2,
            "items": [
              {
                "description": "Creation date represented as string with ISO 8601 date format (YYYY-MM-DD).",
                "type": "string"
              },
              {
                "description": "Number of issues or merge requests created at the given date.",
                "type": "integer"
              }
            ]
          }
        ]
      }
    }
  }
}
