Heroku, a cloud application platform, has announced that it is transitioning to a sustaining engineering model, which means it will focus on maintaining current operations and keeping the platform running, but will not invest in new features or innovations. This decision may impact the platform's ability to attract new customers and retain existing ones. Heroku's announcement has sparked discussion about the platform's future and the implications of this decision. The company will continue to support its existing customers, but its focus will shift from growth and development to maintenance and stability.