BTW honest question - what is the idea behind not running ember in production mode with -prod ?
We use the EMBER_ENV environment variable instead of the -prod flag. The result should be the same. I certainly see a production build running here on Meta and other sites.
I’m not sure what’s printing Environment: development to the build log… we should investigate 
Moved this to its own topic to track
I’m also showing environment development when upgrading discourse.
It shouldn’t make any functional difference… but here’s a PR to use -prod and therefore fix up the logging: