In-production performance monitoring is required for dynamic and modular systems open to third-party applications such as the OSGi-based smart home box that home actors envision today. Existing approaches are not suitable for in-production monitoring as they generally induce a strong persistent overhead. This paper proposes a progressive and localized monitoring system that is able to dynamically activate/deactivate and tune the accuracy of monitoring mechanisms depending on detected performance issues. In particular, it proposes to build a proxy-aware service registry in order to inject proxies on-the- y without stopping bundles and it advocates the use of localized sampling. Our evaluation shows that the overhead of our monitoring system is only 2% when idle and comparable with traditional systems when completely active(around 20%).