cmd/devp2p: make crawler-route53-updater less verbose (ethereum#27116)

Follow-up to ethereum#26697, makes the crawler less verbose on route53-based scenarios.

It also changes the loglevel from debug to info on Updates, which are typically the root, and can be interesting to see.

cmd/devp2p/dns_cloudflare.go

@@ -144,7 +144,7 @@ func (c *cloudflareClient) uploadRecords(name string, records map[string]string)
 			_, err = c.CreateDNSRecord(context.Background(), c.zoneID, record)
 		} else if old.Content != val {
 			// Entry already exists, only change its content.
-			log.Debug(fmt.Sprintf("Updating %s from %q to %q", path, old.Content, val))
+			log.Info(fmt.Sprintf("Updating %s from %q to %q", path, old.Content, val))
 			updated++
 			old.Content = val
 			err = c.UpdateDNSRecord(context.Background(), c.zoneID, old.ID, old)

cmd/devp2p/dns_route53.go

@@ -221,7 +221,13 @@ func (c *route53Client) computeChanges(name string, records map[string]string, e
 	}
 	records = lrecords
 
-	var changes []types.Change
+	var (
+		changes []types.Change
+		inserts int
+		upserts int
+		skips   int
+	)
+
 	for path, newValue := range records {
 		prevRecords, exists := existing[path]
 		prevValue := strings.Join(prevRecords.values, "")
@@ -237,20 +243,30 @@ func (c *route53Client) computeChanges(name string, records map[string]string, e
 
 		if !exists {
 			// Entry is unknown, push a new one
-			log.Info(fmt.Sprintf("Creating %s = %s", path, newValue))
+			log.Debug(fmt.Sprintf("Creating %s = %s", path, newValue))
 			changes = append(changes, newTXTChange("CREATE", path, ttl, newValue))
+			inserts++
 		} else if prevValue != newValue || prevRecords.ttl != ttl {
 			// Entry already exists, only change its content.
 			log.Info(fmt.Sprintf("Updating %s from %s to %s", path, prevValue, newValue))
 			changes = append(changes, newTXTChange("UPSERT", path, ttl, newValue))
+			upserts++
 		} else {
 			log.Debug(fmt.Sprintf("Skipping %s = %s", path, newValue))
+			skips++
 		}
 	}
 
 	// Iterate over the old records and delete anything stale.
-	changes = append(changes, makeDeletionChanges(existing, records)...)
-
+	deletions := makeDeletionChanges(existing, records)
+	changes = append(changes, deletions...)
+
+	log.Info("Computed DNS changes",
+		"changes", len(changes),
+		"inserts", inserts,
+		"skips", skips,
+		"deleted", len(deletions),
+		"upserts", upserts)
 	// Ensure changes are in the correct order.
 	sortChanges(changes)
 	return changes
@@ -263,7 +279,7 @@ func makeDeletionChanges(records map[string]recordSet, keep map[string]string) [
 		if _, ok := keep[path]; ok {
 			continue
 		}
-		log.Info(fmt.Sprintf("Deleting %s = %s", path, strings.Join(set.values, "")))
+		log.Debug(fmt.Sprintf("Deleting %s = %s", path, strings.Join(set.values, "")))
 		changes = append(changes, newTXTChange("DELETE", path, set.ttl, set.values...))
 	}
 	return changes