checker: remove CollectedAt from DANEData

The observation timestamp is already managed by the core; there is no
need for the checker to record it separately.

checker/collect.go

@@ -8,7 +8,6 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"time"
 
 	sdk "git.happydns.org/checker-sdk-go/checker"
 	tlscontract "git.happydns.org/checker-tls/contract"
@@ -192,9 +191,8 @@ func (p *daneProvider) Collect(ctx context.Context, opts sdk.CheckerOptions) (an
 	}
 
 	data := &DANEData{
-		Targets:     targets,
-		Invalid:     invalid,
-		CollectedAt: time.Now().UTC(),
+		Targets: targets,
+		Invalid: invalid,
 	}
 	if v, ok := opts[OptionDNSSECValidated]; ok {
 		if b, ok := v.(bool); ok {