Assuming that feature flag toggles are a good idea, and should be implemented into code that developers write. For example Etsy swear by them as a major part of their culture.
What is a good way to persuade (and enforce) developers to start using feature flag toggles?
More information about feature flag toggles is explained in Q: How to use feature flag togglesQ: How to use feature flag toggles, Q: What are feature flag togglesQ: What are feature flag toggles and very extensively in Pete Hodgson's article on the subject on Martin Fowler's blog.