The highest tagged major version is v4.

dockerregistry/

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Path	Synopsis
server Package server wraps repository and blob store objects of docker/distribution upstream.	Package server wraps repository and blob store objects of docker/distribution upstream.
api Package api describes routes and urls that extends the Registry JSON HTTP API.	Package api describes routes and urls that extends the Registry JSON HTTP API.
audit Package audit log the beginning and end of each API request to different logger.	Package audit log the beginning and end of each API request to different logger.
client Package client provides functions to make requests to external APIs.	Package client provides functions to make requests to external APIs.
configuration
maxconnections
metrics Package metrics provides functions to collect runtime registry statistics and expose the registered metrics via HTTP.	Package metrics provides functions to collect runtime registry statistics and expose the registered metrics via HTTP.
prune
testutil