Alerting: Notifications Routes API (#91550)

* Introduce new models RoutingTree, RouteDefaults and Route and api-server to serve them that is backed by provisioning notification policy service.

* update method UpdatePolicyTree of notification policy service to return route and new version

* declare new actions alert.notifications.routes:read and alert.notifications.routes:write and two corresponding fixed roles.

---------

Co-authored-by: Tom Ratcliffe <tom.ratcliffe@grafana.com>
Co-authored-by: Matthew Jacobson <matthew.jacobson@grafana.com>

pkg/generated/informers/externalversions/alerting_notifications/v0alpha1/interface.go

@@ -12,6 +12,8 @@ import (
 type Interface interface {
 	// Receivers returns a ReceiverInformer.
 	Receivers() ReceiverInformer
+	// RoutingTrees returns a RoutingTreeInformer.
+	RoutingTrees() RoutingTreeInformer
 	// TemplateGroups returns a TemplateGroupInformer.
 	TemplateGroups() TemplateGroupInformer
 	// TimeIntervals returns a TimeIntervalInformer.
@@ -34,6 +36,11 @@ func (v *version) Receivers() ReceiverInformer {
 	return &receiverInformer{factory: v.factory, namespace: v.namespace, tweakListOptions: v.tweakListOptions}
 }
 
+// RoutingTrees returns a RoutingTreeInformer.
+func (v *version) RoutingTrees() RoutingTreeInformer {
+	return &routingTreeInformer{factory: v.factory, namespace: v.namespace, tweakListOptions: v.tweakListOptions}
+}
+
 // TemplateGroups returns a TemplateGroupInformer.
 func (v *version) TemplateGroups() TemplateGroupInformer {
 	return &templateGroupInformer{factory: v.factory, namespace: v.namespace, tweakListOptions: v.tweakListOptions}

pkg/generated/informers/externalversions/alerting_notifications/v0alpha1/routingtree.go

@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// Code generated by informer-gen. DO NOT EDIT.
+
+package v0alpha1
+
+import (
+	"context"
+	time "time"
+
+	alertingnotificationsv0alpha1 "github.com/grafana/grafana/pkg/apis/alerting_notifications/v0alpha1"
+	versioned "github.com/grafana/grafana/pkg/generated/clientset/versioned"
+	internalinterfaces "github.com/grafana/grafana/pkg/generated/informers/externalversions/internalinterfaces"
+	v0alpha1 "github.com/grafana/grafana/pkg/generated/listers/alerting_notifications/v0alpha1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	runtime "k8s.io/apimachinery/pkg/runtime"
+	watch "k8s.io/apimachinery/pkg/watch"
+	cache "k8s.io/client-go/tools/cache"
+)
+
+// RoutingTreeInformer provides access to a shared informer and lister for
+// RoutingTrees.
+type RoutingTreeInformer interface {
+	Informer() cache.SharedIndexInformer
+	Lister() v0alpha1.RoutingTreeLister
+}
+
+type routingTreeInformer struct {
+	factory          internalinterfaces.SharedInformerFactory
+	tweakListOptions internalinterfaces.TweakListOptionsFunc
+	namespace        string
+}
+
+// NewRoutingTreeInformer constructs a new informer for RoutingTree type.
+// Always prefer using an informer factory to get a shared informer instead of getting an independent
+// one. This reduces memory footprint and number of connections to the server.
+func NewRoutingTreeInformer(client versioned.Interface, namespace string, resyncPeriod time.Duration, indexers cache.Indexers) cache.SharedIndexInformer {
+	return NewFilteredRoutingTreeInformer(client, namespace, resyncPeriod, indexers, nil)
+}
+
+// NewFilteredRoutingTreeInformer constructs a new informer for RoutingTree type.
+// Always prefer using an informer factory to get a shared informer instead of getting an independent
+// one. This reduces memory footprint and number of connections to the server.
+func NewFilteredRoutingTreeInformer(client versioned.Interface, namespace string, resyncPeriod time.Duration, indexers cache.Indexers, tweakListOptions internalinterfaces.TweakListOptionsFunc) cache.SharedIndexInformer {
+	return cache.NewSharedIndexInformer(
+		&cache.ListWatch{
+			ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
+				if tweakListOptions != nil {
+					tweakListOptions(&options)
+				}
+				return client.NotificationsV0alpha1().RoutingTrees(namespace).List(context.TODO(), options)
+			},
+			WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
+				if tweakListOptions != nil {
+					tweakListOptions(&options)
+				}
+				return client.NotificationsV0alpha1().RoutingTrees(namespace).Watch(context.TODO(), options)
+			},
+		},
+		&alertingnotificationsv0alpha1.RoutingTree{},
+		resyncPeriod,
+		indexers,
+	)
+}
+
+func (f *routingTreeInformer) defaultInformer(client versioned.Interface, resyncPeriod time.Duration) cache.SharedIndexInformer {
+	return NewFilteredRoutingTreeInformer(client, f.namespace, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc}, f.tweakListOptions)
+}
+
+func (f *routingTreeInformer) Informer() cache.SharedIndexInformer {
+	return f.factory.InformerFor(&alertingnotificationsv0alpha1.RoutingTree{}, f.defaultInformer)
+}
+
+func (f *routingTreeInformer) Lister() v0alpha1.RoutingTreeLister {
+	return v0alpha1.NewRoutingTreeLister(f.Informer().GetIndexer())
+}

pkg/generated/informers/externalversions/generic.go

@@ -42,6 +42,8 @@ func (f *sharedInformerFactory) ForResource(resource schema.GroupVersionResource
 	// Group=notifications.alerting.grafana.app, Version=v0alpha1
 	case v0alpha1.SchemeGroupVersion.WithResource("receivers"):
 		return &genericInformer{resource: resource.GroupResource(), informer: f.Notifications().V0alpha1().Receivers().Informer()}, nil
+	case v0alpha1.SchemeGroupVersion.WithResource("routingtrees"):
+		return &genericInformer{resource: resource.GroupResource(), informer: f.Notifications().V0alpha1().RoutingTrees().Informer()}, nil
 	case v0alpha1.SchemeGroupVersion.WithResource("templategroups"):
 		return &genericInformer{resource: resource.GroupResource(), informer: f.Notifications().V0alpha1().TemplateGroups().Informer()}, nil
 	case v0alpha1.SchemeGroupVersion.WithResource("timeintervals"):