curl --request POST \
  --url https://api.gcore.com/cloud/v1/instances/{project_id}/{region_id}/{instance_id}/metrics \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "time_interval": 6
}
'

{
  "count": 1,
  "results": [
    {
      "time": "2020-07-07T12:57:00Z",
      "cpu_util": 8,
      "disks": [
        {
          "disk_Bps_read": 16384,
          "disk_Bps_write": 86016,
          "disk_iops_read": 3,
          "disk_iops_write": 12,
          "disk_name": "sda"
        },
        {
          "disk_Bps_read": 163840,
          "disk_Bps_write": 860160,
          "disk_iops_read": 30,
          "disk_iops_write": 120,
          "disk_name": "sdb"
        }
      ],
      "memory_util": 33.28411162695459,
      "network_Bps_egress": 102,
      "network_Bps_ingress": 102,
      "network_pps_egress": 0.7,
      "network_pps_ingress": 0.7
    }
  ]
}