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Target customers: users of ApsaraDB for POLARDB instances. Features released: CloudMonitor can monitor the following metrics of ApsaraDB for POLARDB: the number of active connections, connection usage, CPU usage, throughput, input/output operations per second, memory usage, CPU cache hit ratio, queries per second, slow queries per second, and transactions per second. In the CloudMonitor console, you can view the monitoring data indicated by these metrics and configure alert rules for these metrics. This allows CloudMonitor to notify the specified alert contacts of an alert when the metric corresponding the alert reaches the specified threshold.