Several options have been deprecated without the addition of a DeprecationWarning to the code-path, in the event that they are actually used (e.g. snapshot and max_scan options to Collection.find) . Instead, their deprecation is merely reflected by a change to the documentation/docstring. While this was sufficient when these deprecations were first introduced, we must now ensure that the use of any such deprecated parameters/options raises a user-visible warning. These warnings will be essential in helping users migrate off of the last 3.x PyMongo release to 4.0 which will remove all deprecated APIs.