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The data gathering some haproxy csv is having some part that need to be excluded from the check!
The SERVERNAME " BACKEND " will always be /1.0 , that mean it will always generate a CRITICAL.
We spoke with Haproxy team (we have a business contract with them) and they told us, there's no way in the config to increase the /1.0 on for this one.
It seems that you are referring to the Sessions column, and you get a CRIT, because 2 out of 1 possible sessions are used (which is weird).
I had a look at the plugin output in one of our datacenters. There, the output looks like this:
So in BACKEND, our HAproxy supports up to 300 connections. In this special case, we are running HAProxy version 2.4.17, and check plugin version 2022021602. What do you use on your side?
Closing this issue. If this check warns about sessions, this is a HAProxy configuration issue. Unsetting or setting maxconn to appropriate values helps (as intended and expected).
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markuslf commentedon Apr 21, 2022
I will have a look into it. 👍
markuslf commentedon Jun 17, 2022
It seems that you are referring to the
Sessionscolumn, and you get a CRIT, because 2 out of 1 possible sessions are used (which is weird).I had a look at the plugin output in one of our datacenters. There, the output looks like this:

So in BACKEND, our HAproxy supports up to 300 connections. In this special case, we are running HAProxy version 2.4.17, and check plugin version 2022021602. What do you use on your side?
10RUPTiV commentedon Jun 21, 2022
Markus,
We are using HAproxy EE 2.4r1 and the latest plugin...
But in our backend config, we have not set any limit... that's probably why we have a limit of "1"
10RUPTiV commentedon Jun 21, 2022
Just did a little test and I can confirm that having no maxconn in the backend setting, equal "unlimited" until we reach the GLOBAL maxconn
markuslf commentedon Jun 30, 2022
Closing this issue. If this check warns about sessions, this is a HAProxy configuration issue. Unsetting or setting
maxconnto appropriate values helps (as intended and expected).