I have a fairly recent DS920+ and never had issues with containers - I have probably 10+ containers on it - grafana, victoriametrics/logs, jellyfin, immich with ML, my custom ubuntu toolboxes for net, media, ffmpeg builds, gluetun for vpn, homeassistant, wallabag,...
Edit: I just checked Grafana and cadvisor reports 23 containers.
Edit2: 4.4.302+ (2022) is my kernel version, there might be specific tools that require more recent kernels, of course, but I was so far lucky enough to not run into those.
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I have a fairly recent DS920+ and never had issues with containers - I have probably 10+ containers on it - grafana, victoriametrics/logs, jellyfin, immich with ML, my custom ubuntu toolboxes for net, media, ffmpeg builds, gluetun for vpn, homeassistant, wallabag,...
Edit: I just checked Grafana and cadvisor reports 23 containers.
Edit2: 4.4.302+ (2022) is my kernel version, there might be specific tools that require more recent kernels, of course, but I was so far lucky enough to not run into those.