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: collectionregion_client.go
    path of file: ./repos/azure-sdk-for-go/sdk/resourcemanager/cosmos/armcosmos
    
    the code of the file until where you have to start completion: //go:build go1.18
// +build go1.18

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
// Code generated by Microsoft (R) AutoRest Code Generator. DO NOT EDIT.
// Changes may cause incorrect behavior and will be lost if the code is regenerated.

package armcosmos

import (
	"context"
	"errors"
	"github.com/Azure/azure-sdk-for-go/sdk/azcore"
	"github.com/Azure/azure-sdk-for-go/sdk/azcore/arm"
	"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
	"github.com/Azure/azure-sdk-for-go/sdk/azcore/runtime"
	"net/http"
	"net/url"
	"strings"
)

// CollectionRegionClient contains the methods for the CollectionRegion group.
// Don't use this type directly, use NewCollectionRegionClient() instead.
type CollectionRegionClient struct {
	internal       *arm.Client
	subscriptionID string
}

// NewCollectionRegionClient creates a new instance of CollectionRegionClient with the specified values.
//   - subscriptionID - The ID of the target subscription.
//   - c
    
func (client *CollectionRegionClient) NewListMetricsPager(resourceGroupName string, accountName string, region string, databaseRid string, collectionRid string, filter string, options *CollectionRegionClientListMetricsOptions) *runtime.Pager[CollectionRegionClientListMetricsResponse] {
	return runtime.NewPager(runtime.PagingHandler[CollectionRegionClientListMetricsResponse]{
		More: func(page CollectionRegionClientListMetricsResponse) bool {
			return false
		},
		Fetcher: func(ctx context.Context, page *CollectionRegionClientListMetricsResponse) (CollectionRegionClientListMetricsResponse, error) {
			ctx = context.WithValue(ctx, runtime.CtxAPINameKey{}, "CollectionRegionClient.NewListMetricsPager")
			req, err := client.listMetricsCreateRequest(ctx, resourceGroupName, accountName, region, databaseRid, collectionRid, filter, options)
			if err != nil {
				return CollectionRegionClientListMetricsResponse{}, err
			}
			resp, err := client.internal.Pipeline().Do(req)
			if err != nil {
				return CollectionRegionClientListMetricsResponse{}, err
			}
			if !runtime.HasStatusCode(resp, http.StatusOK) {
				return CollectionRegionClientListMetricsResponse{}, runtime.NewResponseError(resp)
			}
			return client.listMetricsHandleResponse(resp)
		},
		Tracer: client.internal.Tracer(),
	})
}