value, min and max in class [-0-9.]. Must all be the same UOM. value may be a literal "U" instead, this would indicate that the actual value couldn't be determined
as clearly explained here
https://nagios-plugins.org/doc/guidelines.html#AEN200

Hello,

I have spotted a missing feature. When the "max-prefix" option is set on a session, output is :

/usr/local/bin/check_openbgpd

CHECKBGPCTL CRITICAL - Foo is U (outside range 0:)

even though current state is alright :

bgpctl show

Neighbor AS MsgRcvd MsgSent OutQ Up/Down State/PrfRcvd
Foo 42424 424242 424242 0 42w4d4h 4/42

It would be nice to add this ;-)

Thank you

with sessions like below
Neighbor AS MsgRcvd MsgSent OutQ Up/Down State/PrfRcvd
rpi-v6 65115 0 0 0 Never Active
rpi-v4 65115 0 0 0 Never Idle
`
Actually the probe filter only the state 'Idle', then --idle-list will ignore only rpi-v4 session

a less specific --'ignore-list' will permit to ignore non "Up" sessions like rpi-v6

CHECKBGPCTL UNKNOWN: TypeError: a bytes-like object is required, not 'str'