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+
+#
+# check
+# http://blog.tsunanet.net/2011/03/out-of-socket-memory.html
+#
+# The kernel may penalize orphans by 2x or even 4x
+# so we alarm warning at 25% and critical at 50%
+#
+
+ alarm: tcp_orphans
+ on: ipv4.sockstat_tcp_sockets
+ os: linux
+ hosts: *
+ calc: ${orphan} * 100 / ${tcp_max_orphans}
+ units: %
+ every: 10s
+ warn: $this > (($status >= $WARNING ) ? ( 20 ) : ( 25 ))
+ crit: $this > (($status >= $CRITICAL) ? ( 25 ) : ( 50 ))
+ delay: up 0 down 5m multiplier 1.5 max 1h
+ info: the percentage of orphan IPv4 TCP sockets over the max allowed (this may lead to too-many-orphans errors)
+ to: sysadmin