Some events don't seem to have timestamps. This makes it hard to track live events on the https://cluster-url/k8s/all-namespaces/events screen. First the admin has to scroll past all of the events without timestamps to get to the start of the ones with timestamps.
It might be reasonable for the console to sort by the first value out of lastTimestamp and metadata.creationTimestamp. That would preserve the existing behavior for entries with a lastTimestamp, but would provide a stable ordering for events without it.

4.12.z

Issue is reproducible by draining one of the master nodes and then viewing the "Recent events" pane at /dashboards or the event log at /k8s/all-namespaces/events.
Also, can perform cluster upgrade and monitor recent events on the console. It will lists all events without timestamp first which would make difficult to monitor upgrade task activities.

On the console, it lists all events without timestamp under "Recent events" first.

It should list events with timestamp first to monitor upgrade and other real time events.