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#
# ${tcp_max_connections} may be nan or -1 if the system
# supports dynamic threshold for TCP connections.
# In this case, the alarm will always be zero.
#
alarm: tcp_connections
on: ipv4.tcpsock
os: linux
hosts: *
calc: (${tcp_max_connections} > 0) ? ( ${connections} * 100 / ${tcp_max_connections} ) : 0
units: %
every: 10s
warn: $this > (($status >= $WARNING ) ? ( 60 ) : ( 80 ))
crit: $this > (($status >= $CRITICAL) ? ( 80 ) : ( 90 ))
delay: up 0 down 5m multiplier 1.5 max 1h
info: the percentage of IPv4 TCP connections over the max allowed
to: sysadmin
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