Bitbucket 8.0 removes the old audit API which includes classes in com.atlassian.bitbucket.audit and a number of other classes that converted between the old system and the new system. Bitbucket 8.0 also removes the old legacy REST API for getting audit events by project or repository.

Jira Core has the Audit log improvements for developers documentation. Similar documentation should be created specific for Bitbucket Server/DC regarding the cross-product auditing REST API:

/rest/auditing/1.0/events