I’m running 3.4.0.M1 and assuming this is a real good and stable version I want to report that this version and the 3 previous 3.x versions I used have all a memory leakage.
This means about 1 GB memory in about 10 days is consumed. Could this be a openhab issue, something in my rules? I assume it has nothing to do with the Synology system because grafana and influxdb don’t show any memory consumption.
I cannot really help with your memory leak, but a milestone release is not stable.
The current stable version of openhab is version 3.3.0
If you believe the memory issue is related to your rules, maybe clone your system, disable the rules and see if you can reproduce the issue.