You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: scale.go
    path of file: ./repos/rancher/pkg/controllers/dashboard/scaleavailable
    
    the code of the file until where you have to start completion: package scaleavailable

import (
	"context"
	"strconv"

	"github.com/rancher/rancher/pkg/wrangler"
	appscontrollers "github.com/rancher/wrangler/v2/pkg/generated/controllers/apps/v1"
	corecontrollers "github.com/rancher/wrangler/v2/pkg/generated/controllers/core/v1"
	"github.com/rancher/wrangler/v2/pkg/relatedresource"
	appsv1 "k8s.io/api/apps/v1"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/selection"
)

const (
	availableAnnotation = "management.cattle.io/scale-available"
)

type handler struct {
	node        corecontrollers.NodeCache
	deployments appscontrollers.DeploymentClient
}

func Register(ctx context.Context, wrangler *wrangler.Context) {
	h := &handler{
		node:        wrangler.Core.Node().Cache(),
		deployments: wrangler.Apps.Deployment(),
	}
	deploymentCache := wrangler.Apps.Deployment().Cache()
	wrangler.Apps.Deployment().OnChange(ctx
    
func Register(ctx context.Context, wrangler *wrangler.Context) {
	h := &handler{
		node:        wrangler.Core.Node().Cache(),
		deployments: wrangler.Apps.Deployment(),
	}
	deploymentCache := wrangler.Apps.Deployment().Cache()
	wrangler.Apps.Deployment().OnChange(ctx, "scale-available", h.OnChange)
	deploymentCache.AddIndexer(availableAnnotation, func(obj *appsv1.Deployment) ([]string, error) {
		if val := obj.Annotations[availableAnnotation]; val != "" {
			return []string{availableAnnotation}, nil
		}
		return nil, nil
	})
	relatedresource.Watch(ctx, "scale-available-trigger", func(namespace, name string, obj runtime.Object) (result []relatedresource.Key, _ error) {
		deps, err := deploymentCache.GetByIndex(availableAnnotation, availableAnnotation)
		if err != nil {
			return nil, err
		}
		for _, obj := range deps {
			result = append(result, relatedresource.Key{
				Namespace: obj.Namespace,
				Name:      obj.Name,
			})
		}
		return result, nil
	}, wrangler.Apps.Deployment(), wrangler.Core.Node())
}