Track tasks done by developers and see which risks are associated with the work done. Manage and predict future issues.
See how much your team is experienced in different parts of code. To be on a safe side, there should be at least 2-3 developers with a high expertise in each region of code.
There are always people in a team who are working on some part of a product for the first time and are newbees there. They could make typical mistakes without being supervised and mentored by experts in related parts of the product. These mistakes could be easily prevented by improved knowledge sharing flow.