grid2: add order side to the metrics label

pkg/strategy/grid2/metrics.go

@@ -52,6 +52,7 @@ func initMetrics(extendedLabels []string) {
 			"exchange", // exchange name
 			"symbol",   // symbol of the market
 			"ith",
+			"side",
 		}, extendedLabels...),
 	)
 

pkg/strategy/grid2/strategy.go

@@ -884,6 +884,7 @@ func (s *Strategy) updateOpenOrderPricesMetrics(orders []types.Order) {
 	metricsGridOrderPrices.Reset()
 	for idx, order := range orders {
 		labels := s.newPrometheusLabels()
+		labels["side"] = order.Side.String()
 		labels["ith"] = strconv.Itoa(num - idx)
 		metricsGridOrderPrices.With(labels).Set(order.Price.Float64())
 	}