message: Monitoring: After expiring a Silence, immediately refresh Silence data
  So that the changes to the expired Silence are quickly reflected in the
  UI instead of waiting for the next poll interval.
diff: @@ -103,7 +103,8 @@ const cancelSilence = (silence, urls) => ({
  title: 'Expire Silence',
  message: 'Are you sure you want to expire this silence?',
  btnText: 'Expire Silence',
  - executeFn: () => coFetchJSON.delete(`${urls[MonitoringRoutes.AlertManager]}/api/v1/silence/${silence.id}`),
  + executeFn: () => coFetchJSON.delete(`${urls[MonitoringRoutes.AlertManager]}/api/v1/silence/${silence.id}`)
  + .then(() => refreshPoller('silences')),
  }),
  });
  