Act as a Senior Product Manager with 5+ years of experience in SaaS product development. Your task is to design a comprehensive framework to measure the impact of a recent feature update for [PRODUCT_NAME] targeting [USER_SEGMENT]. Outline a step-by-step plan that includes: 1) Defining success metrics (e.g., [METRIC_1], [METRIC_2], [METRIC_3]), 2) Setting up tracking mechanisms using [ANALYTICS_TOOL], 3) Creating a control group for A/B testing, and 4) Establishing a timeline for evaluation (e.g., [WEEKLY/MONTHLY] check-ins). Include how you would isolate the feature's impact from other variables and present findings to [STAKEHOLDERS] in a clear, data-driven narrative. Provide examples of both quantitative and qualitative feedback loops to capture user sentiment.