Monitor and tune Azure Cosmos DB for PostgreSQL
APPLIES TO: PostgreSQL
Monitoring data about your servers helps you troubleshoot and optimize for your workload. Azure Cosmos DB for PostgreSQL provides various monitoring options to provide insight into the behavior of nodes in a cluster.
Azure Cosmos DB for PostgreSQL provides metrics for nodes in a cluster, and aggregate metrics for the group as a whole. The metrics give insight into the behavior of supporting resources. Each metric is emitted at a one-minute frequency, and has up to 30 days of history.
In addition to viewing graphs of the metrics, you can configure alerts. For step-by-step guidance, see How to set up alerts. Other tasks include setting up automated actions, running advanced analytics, and archiving history. For more information, see the Azure Metrics Overview.
Per node vs aggregate
By default, the Azure portal aggregates metrics across nodes in a cluster. However, some metrics, such as disk usage percentage, are more informative on a per-node basis. To see metrics for nodes displayed individually, use Azure Monitor metric splitting by server name.
Some clusters do not support metric splitting. On these clusters, you can view metrics for individual nodes by clicking the node name in the cluster Overview page. Then open the Metrics page for the node.
List of metrics
These metrics are available for nodes:
|Metric||Metric Display Name||Unit||Description|
|active_connections||Active Connections||Count||The number of active connections to the server.|
|apps_reserved_memory_percent||Reserved Memory Percent||Percent||Calculated from the ratio of Committed_AS/CommitLimit as shown in /proc/meminfo.|
|cpu_percent||CPU percent||Percent||The percentage of CPU in use.|
|iops||IOPS||Count||See the IOPS definition and Azure Cosmos DB for PostgreSQL throughput|
|memory_percent||Memory percent||Percent||The percentage of memory in use.|
|network_bytes_ingress||Network In||Bytes||Network In across active connections.|
|network_bytes_egress||Network Out||Bytes||Network Out across active connections.|
|replication_lag||Replication Lag||Seconds||How far read replica nodes are behind their counterparts in the primary cluster.|
|storage_percent||Storage percentage||Percent||The percentage of storage used out of the server's maximum.|
|storage_used||Storage used||Bytes||The amount of storage in use. The storage used by the service may include the database files, transaction logs, and the server logs.|
Azure supplies no aggregate metrics for the cluster as a whole, but metrics for multiple nodes can be placed on the same graph.
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