It is not recommended to manually scale your dynos through Heroku directly when using HireFire. We cache your dyno formation in HireFire for 10 minutes to significantly reduce the amount of API calls against Heroku. If you manually change your dyno formation via the Heroku UI or CLI, there is high chance that HireFire will ignore that operation and proceed as if your dyno formation is whatever it was prior to you manually changing it.
If you wish to manually scale your dyno formation, we recommend that you temporarily set the
maximum for the corresponding dyno manager to a higher or lower number and wait for HireFire to scale it on your behalf. Once done, HireFire will have properly registered the scaling operation and re-cached the new dyno formation. Afterwards, you can set the
maximum back to their original values.