OneStream EmployeeApplicationName is the name of the OneStream application you're connecting to.
AdapterName is the name of the Data Adapter being executed - note how the api you call is named "GetAdoDataSetForAdapter" ? A Data Adapter is an artefact that returns some data (for example, from an SQL query). There can be dozens of them in any application, so you have to specify which one you want to get data from.
Note that this API is not focused on audit logs, it's a generic way to extract data from Onestream. For this to work, someone must have configured an adapter inside a Onestream application to return the relevant information.
