# -----------------------------------------------------------------------------
# low disk space

# checking the latest collected values
# raise an alarm if the disk is low on
# available disk space

template: disk_full_percentage
      on: disk.space
    calc: $used * 100 / ($avail + $used)
   every: 1m
    warn: $this > 80
    crit: $used > 95


# -----------------------------------------------------------------------------
# disk fill rate

# calculate the rate the disk fills
# use as base, the available space change
# during the last 10 minutes

# this is just a calculation - it has no alarm
# we will use it in the next template to find
# the hours remaining

template: disk_fill_rate
      on: disk.space
  lookup: max -1s at -10m unaligned of avail
    calc: ($this - $avail) / (10 * 60)
   every: 30s


# calculate the hours remaininig
# if the disk continues to fill
# in this rate

template: disk_will_fill_in_hours
      on: disk.space
    calc: $avail / $disk_fill_rate / 3600
   every: 10s
    warn: $this > 0 and $this < 48
    crit: $this > 0 and $this < 24


# -----------------------------------------------------------------------------
# disk congestion

# raise an alarm if the disk is congested
# by calculating the average disk utilization
# for the last minute

template: disk_congested
      on: disk.util
  lookup: average -1m every 1m unaligned
   green: 70
     red: 95
    warn: $this > $green
    crit: $this > $red

# raise an alarm if the disk backlog
# is above 1000ms (1s) per second
# for 1 minute
# (i.e. the disk cannot catch up)

template: disk_not_catching_up
      on: disk.backlog
  lookup: average -1m every 1m unaligned
   green: 1000
     red: 2000
    warn: $this > $green
    crit: $this > $red