All OpenvCloud components generate log information, visible on the Logs page in the Grid Portal, as documented here. Each log record is related to a job. A job is actually a JumpScript triggered by user operations and automated tasks. Jobs are documented here, and JumpScripts are documented here.
Furthermore, all REST API calls, typically trigged by user operations in the various OpenvCloud web portals, are audited and made visible on the Audit page in the Grid Portal, as documented here.