# 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
      class: Errors
       type: System
  component: Network
host labels: _os=linux
       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
    summary: System TCP orphan sockets utilization
       info: Orphan IPv4 TCP sockets utilization
         to: silent
