Loki test variables dashboard

dashboard.json

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    {
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      "targets": [
        {
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        "current": {
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          "value": "age"
        },
        "datasource": {
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          "uid": "PDDA8E780A17E7EF1"
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        "definition": "label_names()",
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        "name": "labelNames",
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        "query": "label_names()",
        "refresh": 2,
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        "query": "label_values($labelNames)",
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          "value": "data"
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        "definition": "label_values({age=\"old\"}, source)",
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        "query": "label_values({age=\"old\"}, source)",
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        "definition": "label_values({age=\"old\"},$labelNames)",
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        "name": "labelValuesWithStreamVariable",
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        "query": "label_values({age=\"old\"},$labelNames)",
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  "time": {
    "from": "now-6h",
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  "timepicker": {
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