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# 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 > (10 * $update_every)
units: seconds ago
info: number of seconds since the last successful data collection
# detect if memcached cache is full
template: cache_full_pcent
on: memcached.cache
calc: $used * 100 / ($used + $available)
every: 10s
warn: $this > 80
crit: $this > 90
units: %
info: current cache memory usage
# find the rate memcached cache is filling
template: cache_fill_rate
on: memcached.cache
lookup: max -1s at -30m unaligned of available
calc: ($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
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