Get available metrics for a machine

{
  "data": [
    {}
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{
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      "errorCode": "RequestValidationError",
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        "type": "body",
        "key": "username"
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{
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      "errorCode": "Unauthorized",
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      "extension": {}
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{
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      "errorCode": "NoPermission",
      "message": "You do not have permission to access this resource.",
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{
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      "errorCode": "NotFound",
      "message": "The requested resource was not found.",
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{
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