def scan_activity
      r = execute(make_xml('ScanActivityRequest'))
      res = []
      if r.success
        r.res.elements.each('//ScanSummary') do |scan|
          res << ScanSummary.parse(scan)
        end
      end
      res
    end
def scan_activity
      r = execute(make_xml('ScanActivityRequest'))
      res = []
      if r.success
        r.res.elements.each('//ScanSummary') do |scan|
          res << ScanSummary.parse(scan)
        end
      end
      res
    end
Retrieve a list of current scan activities across all Scan Engines
 managed by Nexpose.

 @return [Array[ScanSummary]] Array of ScanSummary objects associated with
   each active scan on the engines.