Concise monthly summary for 2025-03 focusing on key features and bugs delivered in pingcap/tidb. In March 2025, the primary delivery was a Coprocessor Latency Metric Upgrade to improve latency visibility for coprocessor requests. This involved switching the 99.9th percentile metric from tidb_tikvclient_cop_duration_seconds_bucket to tidb_tikvclient_request_seconds_bucket, providing a more accurate representation of request latency and enabling more effective performance tuning and SLA monitoring. Related commit: 12548a4dd45203dd62bea161cdd66e6b2b582c6f (infoschema,metrics: use tidb_tikvclient_request_seconds_bucket to get the .999 cop req duration instead (#59845)). No other major bugs documented for this repo in March 2025 in the provided data. Overall, the change improves observability and data quality with minimal surface area, contributing to more reliable performance engineering. Key areas of impact include improved latency visibility for coprocessor requests, better data for tuning decisions, and clearer traceability through the commit referenced above.