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: auto_refresh.go
    path of file: ./repos/flyte/flytestdlib/cache
    
    the code of the file until where you have to start completion: package cache

import (
	"context"
	"fmt"
	"sync"
	"time"

	lru "github.com/hashicorp/golang-lru"
	"github.com/prometheus/client_golang/prometheus"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/client-go/util/workqueue"

	"github.com/flyteorg/flyte/flytestdlib/contextutils"
	"github.com/flyteorg/flyte/flytestdlib/errors"
	"github.com/flyteorg/flyte/flytestdlib/logger"
	"github.com/flyteorg/flyte/flytestdlib/promutils"
)

type ItemID = string
type Batch = []ItemWrapper

const (
	ErrNotFou
    
func newMetrics(scope promutils.Scope) metrics {
	return metrics{
		SyncErrors:  scope.MustNewCounter("sync_errors", "Counter for sync errors."),
		Evictions:   scope.MustNewCounter("lru_evictions", "Counter for evictions from LRU."),
		SyncLatency: scope.MustNewStopWatch("latency", "Latency for sync operations.", time.Millisecond),
		CacheHit:    scope.MustNewCounter("cache_hit", "Counter for cache hits."),
		CacheMiss:   scope.MustNewCounter("cache_miss", "Counter for cache misses."),
		Size:        scope.MustNewGauge("size", "Current size of the cache"),
		scope:       scope,
	}
}