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Error message

{context}: duplicate stats: {stat_names}
Example: defaults: duplicate stats: value_count

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When this error occurs

Each enabled_stats array must contain unique entries. This error is raised when the same stat name appears two or more times at any level — defaults, namespace scope, field override, or nested node.

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Example: request that triggers this error

{
  "defaults": {
    "enabled_stats": ["value_count", "null_value_count", "value_count"]
  },
  "refresh": { "trigger": "manual" }
}
value_count appears twice in the defaults stat list.

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How to fix

Remove the duplicate entries: 
{
  "defaults": {
    "enabled_stats": ["value_count", "null_value_count"]
  },
  "refresh": { "trigger": "manual" }
}
The {context} prefix in the error message tells you exactly where the duplicate was found (e.g., defaults, dataset.scope, dataset.fields[price]).