# File lib/fog/compute/requests/aws/describe_instances.rb, line 55
        def describe_instances(filters = {})
          unless filters.is_a?(Hash)
            Formatador.display_line("[yellow][WARN] describe_instances with #{filters.class} param is deprecated, use describe_instances('instance-id' => []) instead[/] [light_black](#{caller.first})[/]")
            filters = {'instance-id' => [*filters]}
          end
          params = {}
          # when seeking single instance id, old param style provides more accurate data sooner
          if filters['instance-id'] && !filters['instance-id'].is_a?(Array)
            params.merge!('InstanceId' => filters.delete('instance-id'))
          end
          params.merge!(Fog::AWS.indexed_filters(filters))

          request({
            'Action'    => 'DescribeInstances',
            :idempotent => true,
            :parser     => Fog::Parsers::Compute::AWS::DescribeInstances.new
          }.merge!(params))
        end