pulp_maven 0.5.0 release[0] introduces a new API to add cached maven content to a repository. This helps prevent cached content from being removed by orphan cleanup tasks. pulp-cli-maven 0.2.0[1] provides a new command that takes advantage of this API. See documentation on how to use it[2].
[0] pulp-maven · PyPI
[1] pulp-cli-maven · PyPI
[2] Cache Maven Repository — Pulp maven Support 0.5.0 documentation