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Aleksei Sviridkin
31c15b282f
## What this PR does Lays the foundation for migrating tenant LoadBalancer exposure off the deprecated `Service.spec.externalIPs` (KEP-5707) and, eventually, off MetalLB onto Cilium-native announcement — the mechanism-agnostic shape prescribed when the earlier chart-side approach (#2468) was reverted in #2603. It adds a new `network.cozystack.io/v1alpha1` API group and a controller that translates intent into whichever LoadBalancer backend the cluster admin configured: - `ExposureClass` (cluster-scoped, admin): binds a logical class name to a backend (`externalIPs` | `metallb` | `cilium` | `robotlb`) and its VIP address scope — the StorageClass/IngressClass pattern. - `ServiceExposure` (namespaced, tenant intent): "expose this Service via class X"; status reports the resolved backend and assigned IPs. - A `serviceexposure` controller renders the backend's pool + announcer once per class (MetalLB `IPAddressPool` + `L2Advertisement`; Cilium `CiliumLoadBalancerIPPool` + `CiliumL2AnnouncementPolicy`), scoped to the namespaces that opted in. Backends are pluggable behind a small Go interface, so adding BGP or another cloud LB is one implementation, not an API change. The controller never mutates the target Service — the chart still owns its shape. Platform wiring: `publishing.exposureClass.*` renders the admin `ExposureClass` and the host ingress publishes through it. The default (no class set, `externalIPs`) leaves every existing cluster's behaviour byte-for-byte unchanged; the MetalLB→Cilium announcer migration becomes a single `ExposureClass.spec.backend` change. This is the foundation only — Part of #2586. Converting per-app exposure, flipping Cilium `l2announcements` on, changing the default, and removing MetalLB are deferred to later phases. ### Release note ```release-note feat(network): add ExposureClass and ServiceExposure for mechanism-agnostic LoadBalancer exposure. Opt-in foundation; the default externalIPs publishing path is unchanged. ``` <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added new `ExposureClass` and `ServiceExposure` custom resources with support for multiple backends (externalIPs, MetalLB, Cilium, RobotLB), including optional L2 and address configuration. * Added Helm wiring and templates to enable service/ingress publishing via `ServiceExposure`, selecting a configured (or default) `ExposureClass`. * **Bug Fixes** * Improved reconciliation, finalizer-based cleanup, and status updates for readiness and assigned IP reporting, including safer handling when backends or managed resources change. * **Tests** * Added end-to-end and unit test coverage for backend rendering, readiness, and cleanup flows. <!-- end of auto-generated comment: release notes by coderabbit.ai -->