Often when a customer is experiencing an error, we can see some sort of notification within the console describing what API failed it's call, what service timed out, or some other details about the failure.
Typically, the error message includes no identifying information on which user had the error. Meaning that a frequent error could be either 1 user is having an issue 100 times, 100 users having an issue 1 time, or any range in between.
If a website user is logged into our site, and an error is thrown from an action they take, that should be an available column in the application logs.