The audit logs will only get the information of the events and actions being performed by users, service principals in the workspace, so there is no compliance actions being tracked itself.
The Service name is a subgroup of items you want to check, so for example if you want to check job related events, there is service name called Jobs, same for Account events, etc, while the action name is the actual event you want to track, if you want to check users logins, if a job was deleted, if a table was created in UC.