message: frontend: Change "No Events" message to mention the events time limit
diff: @@ -236,7 +236,7 @@ class EventStream_ extends SafetyFirst {
  sysEventStatus = (
  <Box className="co-sysevent-stream__status-box-empty">
  <div className="cos-text-center cos-status-box__detail">
  - No Events
  + No Events in the past hour
  </div>
  </Box>
  );
  