During the 1.25 development cycle, the API has been warning you if you're specifying neither the "continue" nor "rawcontinue" parameters to action=query. Recently this warning was targeted more specifically to queries that actually return continuation data. The time is coming soon for making this change, so please check your bots, bot frameworks, scripts, and so on to ensure that you won't be broken when this change is made.
If you want to continue using your existing continuation code unchanged, all you need to do is add the "rawcontinue" parameter to your action=query queries.
If you'd rather change to the easier-to-get-right new style, add an empty "continue" parameter to your initial action=query queries. See
for details on the new mechanism.