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: cachekvstore.go
    path of file: ./repos/grafana/pkg/services/pluginsintegration/cachekvstore
    
    the code of the file until where you have to start completion: package cachekvstore

import (
	"context"
	"encoding/json"
	"fmt"
	"time"

	"github.com/grafana/grafana/pkg/infra/kvstore"
)

// keyLastUpdated is the key used to store the last updated time.
const 
    
func (s *CacheKvStore) ListKeys(ctx context.Context) ([]string, error) {
	keys, err := s.kv.Keys(ctx, s.storeKey(""))
	if err != nil {
		return nil, err
	}
	if len(keys) == 0 {
		return nil, nil
	}
	res := make([]string, 0, len(keys)-1)
	for _, key := range keys {
		// Filter out last updated time
		if key.Key == keyLastUpdated {
			continue
		}
		res = append(res, key.Key)
	}
	return res, nil
}