https://phabricator.wikimedia.org/T124003#2815058

Per @hindustanilanguage:

Urdu Wikipedia is a small community with a few dedicated contributors. We often congratulate fellow members on editing achievements manually, yet there are occasions when we probably forget and thus fail in our minimum courtesy. We would like to avoid it. We need a bot on Urdu Wikipedia which will automatically congratulate
(1) Users on completion of every 500 edits &
(2) Users on reaching an editing milestone of every 50,000 bytes.

Urdu village pump discussion to this effect

We have no problem if a similar system is in place for all Wikimedia projects.