The module snmpa_error contains two callback functions which are called if an error occurs at different times during agent operation. These functions in turn calls the corresponding function in the configured error report module, which implements the actual report functionality.
The error report module is configured using the directive error_report_mod, see configuration parameters.
user_err(Format, Args) -> void()
The function is called if a user related error occurs at run-time, for example if a user defined instrumentation function returns erroneous.
Format and Args are as in io:format(Format, Args).