This is because the sysstat package does not actually have a systemd unit. It just has a sysvinit init.d script, so you can't enable/disable this via systemd. You need to enable/disable it via update-rc.d (or manual symlinks in /etc/rc?.d/).
This is because the sysstat package does not actually have a systemd unit. It just has a sysvinit init.d script, so you can't enable/disable this via systemd. You need to enable/disable it via update-rc.d (or manual symlinks in /etc/rc?.d/).