Agent does not show upgrade details `UPG_SCHEDULED` after restart

[AndersonQ]

For confirmed bugs, please report:

• Version: 8.12/main
• Operating System: all
• Discuss Forum URL: N/A
• Steps to Reproduce:
  • schedule and upgrade on fleet for 2 min form now
  • check the agent report the upgrade is scheduled
  • restart the agent
  • the status will not show upgrade details UPG_SCHEDULED anymore
  • then after the 2 min has passed, the upgrade will start and fail due to this bug

The logic to set the upgrade details for scheduled upgrades is on the action dispatcher:

elastic-agent/internal/pkg/agent/application/dispatcher/dispatcher.go

Lines 101 to 120 in d394481

	// Dispatch dispatches an action using pre-registered set of handlers.
	// Dispatch will handle action queue operations, and retries.
	// Any action that implements the ScheduledAction interface may be added/removed from the queue based on StartTime.
	// Any action that implements the RetryableAction interface will be rescheduled if the handler returns an error.
	func (ad *ActionDispatcher) Dispatch(ctx context.Context, detailsSetter details.Observer, acker acker.Acker, actions ...fleetapi.Action) {
	var err error
	span, ctx := apm.StartSpan(ctx, "dispatch", "app.internal")
	defer func() {
	apm.CaptureError(ctx, err).Send()
	span.End()
	}()
	ad.removeQueuedUpgrades(actions)
	reportNextScheduledUpgrade(actions, detailsSetter, ad.log)
	actions = ad.queueScheduledActions(actions)
	actions = ad.dispatchCancelActions(ctx, actions, acker)
	queued, expired := ad.gatherQueuedActions(time.Now().UTC())
	ad.log.Debugf("Gathered %d actions from queue, %d actions expired", len(queued), len(expired))
	ad.log.Debugf("Expired actions: %v", expired)
	actions = append(actions, queued...)

However it does not take into account the actions loaded from disk when the agent starts

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)