+
+# 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