include delay of directly writing docs to gateway

{
  'directsg-change': { avg: 9.083333333333334, count: 24, stddev: 4.4526833357975155 },
  ...
  'clientsg-doc': { avg: 415.745, count: 400, stddev: 194.89434310672027 },
  ...
  doc:  { avg: 1705.3466740270494,
}