Dont use GR_LOG_* inside real-time thread/handlers which might log in a massive rate

[alexxcons]

replace text-based logging in "hot-paths" entirely.

Other possible options could be:

• To raise a flag on the acquisition_info tag of all concerned channels (Or even add an error message?)
• replace the currentl logging with a proper metrics logger (<-> logged via prometheus) and server-local diagnostics property.

[alexxcons]

Once in action, it might be worth to possibly re-add this log message: #101