# 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
