rails/rails — pull request #9400 by senny (2013-02-24 18:32:20+00:00)
Title: remove config.auto_explain_threshold_in_seconds

We discussed that the auto explain feature is rarely used. This PR removes only the automatic explain. You can still display the explain output for any given relation using `Relation#explain`.

As a side-effect this should also fix the connection problem during asset compilation (#9385). The auto explain initializer in the `ActiveRecord::Railtie` forced a connection.