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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
class: Utilization
type: System
component: Network
host labels: _os=linux
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
summary: System TCP memory utilization
info: TCP memory utilization
to: silent
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