How to log process in LoRa Gateway OS

Hi I would like to know the commands to log the different processes.
Before I was able to log with commands like

journalctl -f -n 100 -u lora-gateway-bridge

journalctl -f -n 100 -u loraserver

journalctl -f -n 100 -u lora-app-server

Could you help me with this? Thanks!

Please see:

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