Add constraints key limitations for label providers
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@ -49,6 +49,10 @@ If the expression is empty, all detected containers are included.
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The expression syntax is based on the `Label("key", "value")`, and `LabelRegex("key", "value")` functions,
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as well as the usual boolean logic, as shown in examples below.
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!!! tip "Constraints key limitations"
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Note that `traefik.*` is a reserved label namespace for configuration and can not be used as a key for custom constraints.
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??? example "Constraints Expression Examples"
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```toml
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