We may choose to turn off broken features with feature toggles (which is often the easiest and least risky option since it involves no deployments to production), or fix forward (i.e., make code changes to fix the defect, which are then pushed into production through the deployment pipeline), or roll back (e.g., switch back to the previous release by using feature toggles or by taking broken servers out of rotation using the blue-green or canary release patterns, etc.)
