metrics: add missing placeholder

Signed-off-by: Nhuanggze <loganhuang@yunify.com>

pkg/models/metrics/metrics_rules.go

@@ -357,7 +357,7 @@ var metricsPromqlMap = map[string]string{
 	"workspace_memory_usage":               `sum by (label_kubesphere_io_workspace) (namespace:container_memory_usage_bytes:sum{namespace!="", $1})`,
 	"workspace_memory_usage_wo_cache":      `sum by (label_kubesphere_io_workspace) (namespace:container_memory_usage_bytes_wo_cache:sum{namespace!="", $1})`,
 	"workspace_net_bytes_transmitted":      `sum by (label_kubesphere_io_workspace) (sum by (namespace) (irate(container_network_transmit_bytes_total{namespace!="", pod_name!="", interface!~"^(cali.+|tunl.+|dummy.+|kube.+|flannel.+|cni.+|docker.+|veth.+|lo.*)", job="kubelet"}[5m])) * on (namespace) group_left(label_kubesphere_io_workspace) kube_namespace_labels{$1})`,
-	"workspace_net_bytes_received":         `sum by (label_kubesphere_io_workspace) (sum by (namespace) (irate(container_network_receive_bytes_total{namespace!="", pod_name!="", interface!~"^(cali.+|tunl.+|dummy.+|kube.+|flannel.+|cni.+|docker.+|veth.+|lo.*)", job="kubelet"}[5m])) * on (namespace) group_left(label_kubesphere_io_workspace) kube_namespace_labels{})`,
+	"workspace_net_bytes_received":         `sum by (label_kubesphere_io_workspace) (sum by (namespace) (irate(container_network_receive_bytes_total{namespace!="", pod_name!="", interface!~"^(cali.+|tunl.+|dummy.+|kube.+|flannel.+|cni.+|docker.+|veth.+|lo.*)", job="kubelet"}[5m])) * on (namespace) group_left(label_kubesphere_io_workspace) kube_namespace_labels{$1})`,
 	"workspace_pod_count":                  `sum by (label_kubesphere_io_workspace) (kube_pod_status_phase{phase!~"Failed|Succeeded", namespace!=""} * on (namespace) group_left(label_kubesphere_io_workspace)(kube_namespace_labels{$1}))`,
 	"workspace_pod_running_count":          `sum by (label_kubesphere_io_workspace) (kube_pod_status_phase{phase="Running", namespace!=""} * on (namespace) group_left(label_kubesphere_io_workspace)(kube_namespace_labels{$1}))`,
 	"workspace_pod_succeeded_count":        `sum by (label_kubesphere_io_workspace) (kube_pod_status_phase{phase="Succeeded", namespace!=""} * on (namespace) group_left(label_kubesphere_io_workspace)(kube_namespace_labels{$1}))`,