low-disk-space.rules

ALERT NodeLowRootDisk
  IF ((node_filesystem_size{mountpoint="/root-disk"} - node_filesystem_free{mountpoint="/root-disk"} ) / node_filesystem_size{mountpoint="/root-disk"} * 100) > 75
  FOR 2m
  LABELS {
    severity="page"
  }
  ANNOTATIONS {
    SUMMARY = "{{$labels.instance}}: Low root disk space",
    DESCRIPTION = "{{$labels.instance}}: Root disk usage is above 75% (current value is: {{ $value }})"
  }

ALERT NodeLowDataDisk
  IF ((node_filesystem_size{mountpoint="/data-disk"} - node_filesystem_free{mountpoint="/data-disk"} ) / node_filesystem_size{mountpoint="/data-disk"} * 100) > 75
  FOR 2m
  LABELS {
    severity="page"
  }
  ANNOTATIONS {
    SUMMARY = "{{$labels.instance}}: Low data disk space",
    DESCRIPTION = "{{$labels.instance}}: Data disk usage is above 75% (current value is: {{ $value }})"
  }