Let's say you're responsible for a diversified corporate bond portfolio. Given the current environment of heightened economic uncertainty, your fund manager is concerned about a potential deterioration in credit risk. Walk me through how you would assess and manage the credit risk within this portfolio.

假设你负责一个包含多家企业债券的投资组合，当前经济环境不确定性增加，你的基金经理对潜在的信用风险恶化表示担忧。请你作为风险专业人士，阐述将如何评估并管理这个企业债投资组合的信用风险。