Reading the docs page http://docs.mongodb.org/manual/tutorial/manage-the-database-profiler, it is not abundantly clear that a database with profiling level set to 0 will still log slow operations in the mongod log file.

I think this needs to be clarified in several places on the page.

The mongod options page does clearly state: "The database logs all slow queries to the log, even when the profiler is not turned on." We probably need something similar noted on the profiler page.