Maybe mentioning it here I will reach some people who still haven't read about it:
After 3,5 years coexistence of the two tags mentioned in the subject it is time for a cleanup.
At ¹ you find the latest, revised proposal. After 3,5 years there is no need for RFC, the voting is open.
To complete the cleanup there is a mechanical edit needed to change objects tagged with measurement_station to monitoring_station. Details for this edit you find at ².
Objections and opinions you can voice at the respectively talk pages, at the the mailing list (announcement) or here.