In KDE System Monitor, why the application-specific network measurements may be missing?

There are two systems running Plasma 5.27.7: Debian testing and openSUSE Tumbleweed. Under openSUSE, System Monitor tracks application-specific network activity, see screenshot: Under Debian, there are no Download/Upload columns (even in the "Configure columns..." list); the app-specific network chart is present but completely dead. Why could these features be missing/inactive on Debian? The versions of System Monitor are also 5.27.7.