The idea of the new stats machinery is that 'stats' becomes an option that enables the basic stats gathering infrastructure in EMPER. At some point, it should become a non-user option, i.e., it should be remove from meson_options.txt. Then comes a layer of fine-grained stats control switches, which default to 'auto'. Third, a new option called 'stats_all' is added, which, if enabled, activates all fine-graind stats knobs that are set to 'auto'.