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Introduce --namespace-label-selector with dynamic per-namespace watch sessions. Namespace label changes update the watched resource set without restarting the controller, while whitelist and blacklist configurations retain precedence. Add stale-session protection, lifecycle handling, documentation, and unit and end-to-end coverage for Kubernetes and Gateway API resources. Refs haproxytech#853.
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Fixes #853.
Summary
Add
--namespace-label-selectorfor clusters where namespace membership is controlled by labels instead of a fixed name list.Matching namespaces are watched at startup. Labeling a namespace starts its watches without restarting the controller; removing or changing the label removes its resources from HAProxy configuration. Relabeling starts a fresh list/watch so changes made while the namespace was unselected are loaded.
--namespace-whitelistand--namespace-blacklistkeep precedence. If either is configured, the selector is ignored with a warning. With the selector unset, the existing informer path is unchanged.Implementation
Validation
The branch adds unit and sequential Kubernetes e2e coverage for startup selection, label and unlabel transitions, relabeling, stale sessions, namespace deletion and recreation, TCP CRs, late CRDs, whitelist and blacklist precedence, and Gateway
AllowedRoutesbehavior.The same source tree passed GitHub Actions on Kubernetes v1.34.0, including the standard e2e job, the Gateway e2e job, build, linters, generated-file checks, formatting, and module checks:
https://github.com/fourhu/kubernetes-ingress/actions/runs/35522646678
Trade-off
The selector path creates informer factories per selected namespace. API traffic and goroutine count therefore grow with the number of matches. This option is intended for a bounded namespace set; leaving the flag unset keeps the current shared-informer behavior.