how to limit maxs agent pods in jenkins k8s plugins

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Jenkins plugin to run dynamic agents in a Kubernetes cluster.

and on my jenkins I config one templage with label "node-6-256G",

so the jenkins will auto create agent like "node-6-256G-xxxxxxx",

but the created agent number no limit, maybe 3 ~6 or more,

and I want to limit just 3. 

so how to do it ?  thanks.