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We can safely remove reading of plugins.xml now since there hasn't been a release cut that uses it, and there are not significant amounts to convert in the repo. We should continue to read the others, but deprecate it. They only need to be looked for if the repository metadata file is missing.

Location of metadata

Metadata will be stored at the directory level, allowing different metadata for each granularity. The file will be called maven-metadata.xml

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