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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
class: Errors
type: System
component: Network
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
summary: System TCP orphan sockets utilization
info: Orphan IPv4 TCP sockets utilization
to: silent
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