Which are the valid values for the field filter[metrics] in analytics query resource

Hi,

I’m trying to get result from de API of Kaltura through the follow resource:

https://www.kaltura.com/api_v3/service/analytics/action/query

and always get the same result:

{
    "code": "REPORTS_QUERY_FAILURE",
    "message": "Failed to retrieve analytics data",
    "objectType": "KalturaAPIException",
    "args": {
        "ERROR_MSG": "N/A"
    }
}

My Question is: Which are the valid values for the field filter[metrics]?

Because I’m trying to execute de the analythics.query resource but seems that the field filter[metrics] must have always a value but in all the documentation does not specify which are the valid values for it.

Thank you for your assistance in this matter,

Regards