// ListLogMetrics lists logs-based metrics.
func (c *MetricsClient) ListLogMetrics(ctx context.Context, req *loggingpb.ListLogMetricsRequest) *LogMetricIterator {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	it := &LogMetricIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*loggingpb.LogMetric, string, error) {
		var resp *loggingpb.ListLogMetricsResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context) error {
			var err error
			resp, err = c.metricsClient.ListLogMetrics(ctx, req)
			return err
		}, c.CallOptions.ListLogMetrics...)
		if err != nil {
			return nil, "", err
		}
		return resp.Metrics, resp.NextPageToken, nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}
	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	return it
}
// ListLogMetrics lists logs-based metrics.
func (c *MetricsClient) ListLogMetrics(ctx context.Context, req *loggingpb.ListLogMetricsRequest) *LogMetricIterator {
	ctx = metadata.NewContext(ctx, c.metadata)
	it := &LogMetricIterator{}
	it.apiCall = func() error {
		var resp *loggingpb.ListLogMetricsResponse
		err := gax.Invoke(ctx, func(ctx context.Context) error {
			var err error
			req.PageToken = it.nextPageToken
			req.PageSize = it.pageSize
			resp, err = c.client.ListLogMetrics(ctx, req)
			return err
		}, c.CallOptions.ListLogMetrics...)
		if err != nil {
			return err
		}
		if resp.NextPageToken == "" {
			it.atLastPage = true
		}
		it.nextPageToken = resp.NextPageToken
		it.items = resp.Metrics
		return nil
	}
	return it
}