To be honest, the answer is "it depends"...
Part of the benefit of the cloud is that you are paying for a service and are not required to do that level of troubleshooting yourself. As you know, Genesys Cloud is a shared system, so whilst there may well be logs in the background, which Genesys's own techs can access, these are not exposed to customers as doing so could potentially compromise other users' data.
That being said, there is nothing to stop you writing information to the Participant data from within the IVR, for example specific return codes from API calls to 3rd party systems etc. which you can then look at by retrieving the Conversation JSON object using the API. (I suggest attending the API class fro Beyond for more information on this.)
What exactly are you looking for? We can perhaps better advise if we have more detail.