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As the demand for high-quality real-time media service through multicast-enabled AG (access grid) increases, the end-to-end QoS (quality of service) provisioning of the media service has become very important. To guarantee the end-to-end QoS, it is essential to monitor the time-varying status of both network (i.e., delay, jitter and loss) and system metrics (i.e., CPU and memory utilization). In this paper, we propose a new service for the AG, to monitor the time-varying conditions of both multicast networks and the AG node systems. When the performance of the AG degrades, the proposed monitoring attempts to pinpoint the cause of performance degradation and explores corresponding reactions to improve the end-to-end performance of the AG. The experimental results show that the proposed monitoring service is really useful in improving the quality of media service for the AG.