Display the API User Which Caused Web Service Error Notifications

We have dozens of web services making REST API calls into our Marketo instance on a daily basis. Getting "web service error" notifications is great, but they aren't actionable at all for us since we have no way of knowing which web service / api user is making the calls that are failing. Having the API user included in these notifications would enable us to quickly troubleshoot. Having to reach out to Marketo support every time one of these errors comes up is ridiculous.