By enabling metadata any plugin that implements metadata.Provider interface will be called for each DNS query, at the beginning of the process for that query, in order to add its own metadata to context.
The metadata collected will be available for all plugins, via the Context parameter provided in the ServeDNS function. The package (code) documentation has examples on how to inspect and retrieve metadata a plugin might be interested in.
The metadata is added by setting a label with a value in the context. These labels should be named
plugin/NAME, where NAME is something descriptive. The only hard requirement the metadata
plugin enforces is that the labels contain a slash. See the documentation for
metadata.SetValueFunc.
The value stored is a string. The empty string signals “no metadata”. See the documentation for
metadata.ValueFunc on how to retrieve this.
metadata [ZONES... ]
metadata.Provider interface needs to be implemented by each plugin willing to provide metadata
information for other plugins. It will be called by metadata and gather the information from all
plugins in context.
Note: this method should work quickly, because it is called for every request.
The rewrite plugin uses meta data to rewrite requests.
The Provider interface and the package level documentation.
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