LaunchDarkly introduces a new feature called the Experimentation add-on, which allows teams to measure the impact of their flagged features on business metrics. This add-on enables multivariate testing and helps in making data-driven decisions for rolling out the best feature variations. It supports full-stack metrics and can be used by operations, frontend, and backend teams. The Experimentation add-on is available to LaunchDarkly Pro and Enterprise plan customers and can be accessed by contacting their account team.