Event Hub metrics shows lots of "Other Errors", how to get details?
Event Hubs can also emit Diagnostic Logs, which contain detailed diagnostic information on errors. See https://docs.microsoft.com/en-us/azure/monitoring-and-diagnostics/monitoring-overview-of-diagnostic-logs#how-to-enable-collection-of-diagnostic-logs for how to enable these logs on your Event Hub. Once they are enabled, you can browse them in your Storage Account or send them into Log Analytics to view them.