fix(): fix cn metric namespace/node label (#16)

## What type of PR is this?

* [ ] Feature
* [x] BUG
* [ ] Alerts
* [ ] Improvement
* [ ] Documentation
* [ ] Test and CI

## Which issue(s) this PR related:

issue # https://github.com/matrixorigin/MO-Cloud/issues/2806

If this is a PR for adding Alert, please finish the workround below :)

## What this PR does / why we need it:

处理 mo cn  job 采集的指标添加 ns，node label

Author: EZ4BRUCE

charts/mo-ob-opensource/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: mo-ob-opensource
 description: mo-ob-opensource's Helm chart for Kubernetes
 type: application
-version: 1.0.3-alpha
+version: 1.0.3-alpha.1
 appVersion: 0.9.0
 dependencies:
 - condition: kube-prometheus-stack.enabled

charts/mo-ob-opensource/values.yaml

@@ -554,6 +554,12 @@ kube-prometheus-stack:
               replacement: $1:$2
             - action: labelmap
               regex: __meta_kubernetes_pod_label_(.+)
+            - source_labels: [__meta_kubernetes_namespace]
+              action: replace
+              target_label: namespace
+            - source_labels: [__meta_kubernetes_pod_node_name]
+              action: replace
+              target_label: node
             - source_labels: [__meta_kubernetes_pod_name]
               action: replace
               target_label: pod