As StateFS is not installed by default in SFOS 3.4.0.24, users have to install the missing StateFS support:

devel-su pkcon install statefs statefs-provider-bluez statefs-provider-connman statefs-provider-mce statefs-provider-ofono statefs-provider-power-udev statefs-provider-profile statefs-provider-qt5

Reboot after installation. After that, collectd will be able to start normally.

I have asked what is expected to be a replacement for StateFS, but no reply yet. Reference: https://forum.sailfishos.org/t/state...for-stats/3751