add warn log

core/services/ocr2/plugins/ocr2keeper/evm21/streams_lookup.go

@@ -528,6 +528,7 @@ func (r *EvmRegistry) multiFeedsRequest(ctx context.Context, ch chan<- MercuryDa
 			// hence, retry in this case. retry will help when we send a very new timestamp and reports are not yet generated
 			if len(response.Reports) != len(sl.feeds) {
 				// TODO: AUTO-5044: calculate what reports are missing and log a warning
+				lggr.Warnf("at timestamp %s upkeep %s mercury v0.3 server retruned 200 status with %d reports while we requested %d feeds, treating as 404 (not found) and retrying", sl.time.String(), sl.upkeepId.String(), len(response.Reports), len(sl.feeds))
 				retryable = true
 				state = encoding.MercuryFlakyFailure
 				return fmt.Errorf("%d", http.StatusNotFound)