dashboard selects wrong cluster "cluster-name" on refresh

[maaft]

The issue is, that in regex "cluster" is used instead of "exported_cluster".

This leads to:

1. no automatic cluster selection when namespace is selected
2. if entered manually, on next data refresh the cluster-name is lost again

Required dashboard change (regex: change "exported" to "exported_cluster")

{
        "current": {},
        "datasource": {
          "type": "prometheus",
          "uid": "${DS_PROMETHEUS}"
        },
        "definition": "cnpg_collector_up{namespace=~\"$namespace\"}",
        "description": "CNPG Cluster",
        "hide": 0,
        "includeAll": false,
        "label": "Cluster",
        "multi": false,
        "name": "cluster",
        "options": [],
        "query": {
          "query": "cnpg_collector_up{namespace=~\"$namespace\"}",
          "refId": "PrometheusVariableQueryEditor-VariableQuery"
        },
        "refresh": 2,
        "regex": "/\\bexported_cluster\\b=\"(?<text>[^\"]+)/g",
        "skipUrlSync": false,
        "sort": 1,
        "type": "query"
      },
      ```