Get all span-based metrics

Example response

{
  "data": [
    {
      "attributes": {
        "compute": {
          "aggregation_type": "distribution",
          "path": "@duration"
        },
        "filter": {
          "query": "@http.status_code:200 service:my-service"
        },
        "group_by": [
          {
            "path": "resource_name",
            "tag_name": "resource_name"
          }
        ]
      },
      "id": "my.metric",
      "type": "spans_metrics"
    }
  ]
}