https://bhikkhucintita.files.wordpress. ... atiebt.pdf
It attempts to rein in some of the conceptual proliferation which has affected this important term. I like this bit, which is related to MN 117:
A simile might help to understand the regulatory role of sati in
making choices according to Dhamma. Sati in this role is like a
thermostat. The heater or air conditioner is like right effort. The
setting of the thermostat is like right view, carrying the age-old
wisdom of climatic comfort, say, 70° F (21° C). The room
temperature is the relevant feature of current situation. The
thermostat pairs the recollection of setting with the discernment
of room temperature, and does this perfectly without distraction.
Would that we were all so reliable.