I have one Heroku process running as follows:
=== scheduler (Standard-2X): bundle exec rake keenio:fetch_stats (1)
scheduler.1982: up 2018/09/14 05:31:44 +0530 (~ 12h ago)
I need to kill this scheduler, Can I use following command for the same.
heroku ps:stop scheduler.1982
Correct. See https://devcenter.heroku.com/articles/one-off-dynos#stopping-one-off-dynos for more details.