通过本文您可以了解云数据库PolarDB的PostgreSQL版的监控项。
当您调用云监控的API接口时，需要获取当前云产品的Namespace和Period，具体取值如下：
- Namespace为acs_polardb。
- Period默认为60秒，也可以为60的整数倍。
当前云产品的MetricName和Dimensions的取值如下表所示。
| 监控项 | 单位 | MetricName | Dimensions | Statistics |
|---|---|---|---|---|
| pg活跃连接数 | Count | pg_active_connections | userId、clusterId、instanceId | Average |
| pg数据块读取数 | Count | pg_blks_read_delta | userId、clusterId、instanceId | Average |
| pg连接使用率 | % | pg_conn_usage | userId、clusterId、instanceId | Average |
| pg CPU使用率 | % | pg_cpu_total | userId、clusterId、instanceId | Average |
| pg数据库最大年龄 | xids | pg_db_age | userId、clusterId、instanceId | Average |
| pg内存使用率 | % | pg_mem_usage | userId、clusterId、instanceId | Average |
| pg数据盘大小 | MB | pg_pls_data_size | userId、clusterId、instanceId | Value |
| pg IOPS | Frequency | pg_pls_iops | userId、clusterId、instanceId | Average |
| pg读IOPS | Frequency | pg_pls_iops_read | userId、clusterId、instanceId | Average |
| pg写IOPS | Frequency | pg_pls_iops_write | userId、clusterId、instanceId | Average |
| pg WAL日志大小 | MB | pg_pls_pg_wal_dir_size | userId、clusterId、instanceId | Value |
| pg IO吞吐 | MB/s | pg_pls_throughput | userId、clusterId、instanceId | Average |
| pg读IO吞吐 | MB/s | pg_pls_throughput_read | userId、clusterId、instanceId | Average |
| pg写IO吞吐 | MB/s | pg_pls_throughput_write | userId、clusterId、instanceId | Average |
| pg事务回滚率 | % | pg_rollback_ratio | userId、clusterId、instanceId | Average |
| pg膨胀点 | S | pg_swell_time | userId、clusterId、instanceId | Average |
| pg TPS | Frequency | pg_tps | userId、clusterId、instanceId | Average |