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+#
+# check
+# http://blog.tsunanet.net/2011/03/out-of-socket-memory.html
+#
+# We give a warning when TCP is under memory pressure
+# and a critical when TCP is 90% of its upper memory limit
+#
+
+ alarm: tcp_memory
+ on: ipv4.sockstat_tcp_mem
+ os: linux
+ hosts: *
+ calc: ${mem} * 100 / ${tcp_mem_high}
+ units: %
+ every: 10s
+ warn: ${mem} > (($status >= $WARNING ) ? ( ${tcp_mem_pressure} * 0.8 ) : ( ${tcp_mem_pressure} ))
+ crit: ${mem} > (($status >= $CRITICAL ) ? ( ${tcp_mem_pressure} ) : ( ${tcp_mem_high} * 0.9 ))
+ delay: up 0 down 5m multiplier 1.5 max 1h
+ info: the amount of TCP memory as a percentage of its max memory limit
+ to: sysadmin