~$ pquery "node_filesystem_files{fstype='ext4'}" | jq .data.result
  {
    "metric": {
      "__name__": "node_filesystem_files",
      "device": "/dev/xvda1",
      "fstype": "ext4",
      "instance": "node1",
      "job": "ec2",
      "mountpoint": "/"
    },
    "value": [1580356901.305, "1024000"]
  },
  {
    "metric": {
      "__name__": "node_filesystem_files",
      "device": "/dev/xvda1",
      "fstype": "ext4",
      "instance": "node2",
      "job": "ec2",
      "mountpoint": "/"
    },
    "value": [1580356901.305, "1024000"]
  },
  {
    "metric": {
      "__name__": "node_filesystem_files",
      "device": "/dev/xvda1",
      "fstype": "ext4",
      "instance": "node3",
      "job": "ec2",
      "mountpoint": "/"
    },
    "value": [1580356901.305, "1024000"]
  }
