Raise plan-failed for a failed delivery plan, with Retry when a retry would run (issue 1314, ADR 0449)

cmd/mesh-controller/watchdogs.go

@@ -55,6 +55,9 @@ type signalFacts struct {
 	waits []waitFacts
 	// batches are the batches not yet cut (S18, S19, novox/hq ADR 0276).
 	batches []batchFacts
+	// failed are the delivery plans that failed and are asked of the operator (S23, novox/hq ADR 0449).
+	failed    []failedPlanFacts
+	failedErr error
 	// refusedSends are the sends a machine refused within the hour for the generation they were composed
 	// from, each naming its sender (S20, novox/hq issue 234).
 	refusedSends    []inventory.Send
@@ -353,6 +356,7 @@ func (w *watchdogs) gather(ctx context.Context) *signalFacts {
 	if f.plansErr == nil {
 		f.batches, f.plansErr = gatherBatches(ctx, inv, now)
 	}
+	f.failed, f.failedErr = gatherFailedPlans(ctx, inv, now)
 	f.loop, f.loopErr = w.gatherLoop()
 	f.asks, f.asksErr = w.gatherAsks(ctx, inv)
 	if open, err := w.keeper.Open(ctx); err != nil {