DescribeParameterGroups (smaws-clients.Smaws_Client

val request : 
  Smaws_Lib.Context.t ->
  describe_parameter_groups_request ->
  (describe_parameter_groups_response,
    [> Smaws_Lib.Protocols.AwsJson.error
    | `InvalidParameterCombinationException of
      invalid_parameter_combination_exception
    | `InvalidParameterValueException of invalid_parameter_value_exception
    | `ParameterGroupNotFoundFault of parameter_group_not_found_fault
    | `ServiceLinkedRoleNotFoundFault of service_linked_role_not_found_fault ])
    Stdlib.result

Returns a list of parameter group descriptions. If a parameter group name is specified, the list will contain only the descriptions for that group.