The phrase "cautionary warning" means a message or advice that is given to make people aware of potential danger or harm, so they can be careful and avoid any negative consequences. Full definition
Hitchcock's mysteries provide cautionary warnings for lawyer - detectives — reminding us how our perspectives are shaped by who we are, the roles we play and where we stand — literally and figuratively — in relationship to what we look upon. (abajournal.com)
The FDA did issue cautionary warnings to the public concerning chicken jerky treats in September 2007 and issued a Preliminary Animal Health Notification in December 2008. (speedwayvet.com)
I enjoyed reading your analysis complete with cautionary warnings about calculating the real costs of a simple renovation (kitchen vs. whole house). (slaw.ca)