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Tencent uses Prometheus and Grafana to set up a monitoring system for Alluxio in 10 minutes. The metrics are generated by different sources and consumed by sinks. There are two types of metrics: cluster metrics and process metrics. Cluster metrics are aggregated from workers and clients, then calculated by the leading master. The flow of metrics from the worker to the master is shown in a diagram below. Sinks are listed in two categories: passive sink and active sink and passive sink. For example, the active sink reports the metrics periodically, so you can get the metrics at any time of the time.