routing: improve loggings for attempt result handling

routing/payment_lifecycle.go

@@ -803,8 +803,8 @@ func (p *paymentLifecycle) handleSwitchErr(attempt *channeldb.HTLCAttempt,
 	// case we can safely send a new payment attempt, and wait for its
 	// result to be available.
 	if errors.Is(sendErr, htlcswitch.ErrPaymentIDNotFound) {
-		log.Debugf("Attempt ID %v for payment %v not found in the "+
-			"Switch, retrying.", attempt.AttemptID, p.identifier)
+		log.Warnf("Failing attempt=%v for payment=%v as it's not "+
+			"found in the Switch", attempt.AttemptID, p.identifier)
 
 		return p.failAttempt(attemptID, sendErr)
 	}
@@ -1083,6 +1083,9 @@ func (p *paymentLifecycle) processSwitchResults() error {
 		// means the payment lifecycle needs to be terminated.
 		_, err := p.handleAttemptResult(a, result)
 		if err != nil {
+			log.Errorf("Error handling result for attempt=%v in "+
+				"payment%v: %v", a.AttemptID, p.identifier, err)
+
 			errReturned = err
 		}