When using the "km_log_func_set" to configure a customized Kamailio logging function:
- **log_custom** module is setting this [per child](https://github.com/kamailio/kamailio/blob/master/src/modules/log_custom/log_...) in the **child_init** function.
- **log_systemd** module is setting this in the [mod_register](https://github.com/kamailio/kamailio/blob/master/src/modules/log_systemd/log...) function.
What is the best practice to follow?