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# make sure memcached is running
template: memcached_last_collected_secs
on: memcached.cache
calc: $now - $last_collected_t
units: seconds ago
every: 10s
warn: $this > (($status >= $WARNING) ? ($update_every) : ( 5 * $update_every))
crit: $this > (($status == $CRITICAL) ? ($update_every) : (60 * $update_every))
delay: down 5m multiplier 1.5 max 1h
info: number of seconds since the last successful data collection
to: dba
# detect if memcached cache is full
template: memcached_cache_memory_usage
on: memcached.cache
calc: $used * 100 / ($used + $available)
units: %
every: 10s
warn: $this > (($status >= $WARNING) ? (70) : (80))
crit: $this > (($status == $CRITICAL) ? (80) : (90))
delay: up 0 down 15m multiplier 1.5 max 1h
info: current cache memory usage
to: dba
# find the rate memcached cache is filling
template: cache_fill_rate
on: memcached.cache
lookup: min -10m at -50m unaligned of available
calc: ($this - $available) / (($now - $after) / 3600)
units: KB/hour
every: 1m
info: average rate the cache fills up (positive), or frees up (negative) space, for the last hour
# find the hours remaining until memcached cache is full
template: out_of_cache_space_time
on: memcached.cache
calc: ($cache_fill_rate > 0) ? ($available / $cache_fill_rate) : (inf)
units: hours
every: 10s
warn: $this > 0 and $this < (($status >= $WARNING) ? (48) : (8))
crit: $this > 0 and $this < (($status == $CRITICAL) ? (24) : (2))
delay: down 15m multiplier 1.5 max 1h
info: estimated time the cache will run out of space, if the system continues to add data with the rate of the last hour
to: dba
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