# make sure memcached is running

template: memcached_last_collected_secs
      on: memcached.cache
    calc: $now - $last_collected_t
   every: 10s
    warn: $this > ( 5 * $update_every)
    crit: $this > (60 * $update_every)
   units: seconds ago
    info: number of seconds since the last successful data collection
      to: dba


# detect if memcached cache is full

template: cache_full_pcent
      on: memcached.cache
    calc: $used * 100 / ($used + $available)
   every: 10s
    warn: $this > 80
    crit: $this > 90
   units: %
    info: current cache memory usage
      to: dba


# find the rate memcached cache is filling

template: cache_fill_rate
      on: memcached.cache
  lookup: max -1s at -30m unaligned of available
    calc: ($this - $available) / ($now - $after)
   every: 15s
   units: KB/s
    info: average rate the cache fills up (positive), or frees up (negative) space, for the last 30 minutes


# find the hours remaining until memcached cache is full

template: cache_full_after_hours
      on: memcached.cache
    calc: $available / $cache_fill_rate / 3600
   every: 10s
    warn: $this > 0 and $this < 48
    crit: $this > 0 and $this < 24
   units: hours
    info: estimated time the cache will run out of space, if the system continues to add data with the rate of the last 30 minutes
      to: dba