list method
Lists the notification channels that have been created for the project.
To list the types of notification channels that are supported, use the ListNotificationChannelDescriptors method.
Request parameters:
name - Required. The project
(https://cloud.google.com/monitoring/api/v3#project_name) on which to
execute the request. The format is: projects/[PROJECT_ID_OR_NUMBER] This
names the container in which to look for the notification channels; it
does not name a specific channel. To query a specific channel by REST
resource name, use the GetNotificationChannel operation.
Value must have pattern ^projects/\[^/\]+$.
filter - Optional. If provided, this field specifies the criteria that
must be met by notification channels to be included in the response.For
more details, see sorting and filtering
(https://cloud.google.com/monitoring/api/v3/sorting-and-filtering).
orderBy - Optional. A comma-separated list of fields by which to sort
the result. Supports the same set of fields as in filter. Entries can be
prefixed with a minus sign to sort in descending rather than ascending
order.For more details, see sorting and filtering
(https://cloud.google.com/monitoring/api/v3/sorting-and-filtering).
pageSize - Optional. The maximum number of results to return in a single
response. If not set to a positive number, a reasonable value will be
chosen by the service.
pageToken - Optional. If non-empty, page_token must contain a value
returned as the next_page_token in a previous response to request the next
set of results.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a ListNotificationChannelsResponse.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<ListNotificationChannelsResponse> list(
  core.String name, {
  core.String? filter,
  core.String? orderBy,
  core.int? pageSize,
  core.String? pageToken,
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if (filter != null) 'filter': [filter],
    if (orderBy != null) 'orderBy': [orderBy],
    if (pageSize != null) 'pageSize': ['${pageSize}'],
    if (pageToken != null) 'pageToken': [pageToken],
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v3/' + core.Uri.encodeFull('$name') + '/notificationChannels';
  final response_ = await _requester.request(
    url_,
    'GET',
    queryParams: queryParams_,
  );
  return ListNotificationChannelsResponse.fromJson(
    response_ as core.Map<core.String, core.dynamic>,
  );
}