chore: update to 5xx, add obscit log for visibility

router/batchrouter/asyncdestinationmanager/klaviyobulkupload/klaviyobulkupload.go

@@ -17,6 +17,7 @@ import (
 	backendconfig "github.com/rudderlabs/rudder-server/backend-config"
 	"github.com/rudderlabs/rudder-server/jobsdb"
 	"github.com/rudderlabs/rudder-server/router/batchrouter/asyncdestinationmanager/common"
+	obskit "github.com/rudderlabs/rudder-observability-kit/go/labels"
 )
 
 const (
@@ -118,11 +119,12 @@ func (kbu *KlaviyoBulkUploader) Poll(pollInput common.AsyncPoll) common.PollStat
 				allComplete = false
 				pollresp, err := kbu.KlaviyoAPIService.GetUploadStatus(importId)
 				if err != nil {
+					kbu.Logger.Errorn("Error during fetching Klaviyo Bulk Upload status", obskit.Error(err))
 					return common.PollStatusResponse{
-						StatusCode: 400,
+						StatusCode: 500,
 						Complete:   true,
 						HasFailed:  true,
-						Error:      `Error during fetching upload status `+ err.Error(),
+						Error:      `Error during fetching upload status ` + err.Error(),
 					}
 				}