op-batcher: Add data size logging to tx manager

op-batcher/batcher/txmgr.go

@@ -62,10 +62,10 @@ func (t *TransactionManager) SendTransaction(ctx context.Context, data []byte) (
 	ctx, cancel := context.WithTimeout(ctx, 100*time.Second) // TODO: Select a timeout that makes sense here.
 	defer cancel()
 	if receipt, err := t.txMgr.Send(ctx, updateGasPrice, t.l1Client.SendTransaction); err != nil {
-		t.log.Warn("unable to publish tx", "err", err)
+		t.log.Warn("unable to publish tx", "err", err, "data_size", len(data))
 		return nil, err
 	} else {
-		t.log.Info("tx successfully published", "tx_hash", receipt.TxHash)
+		t.log.Info("tx successfully published", "tx_hash", receipt.TxHash, "data_size", len(data))
 		return receipt, nil
 	}
 }