You can use Cloud Eye to monitor cluster metrics of CSS in real time and quickly handle exceptions. For details about Cloud Eye, see the Cloud Eye User Guide.

Table 1 lists the metrics supported by CSS.

**Table 1** Supported metrics
Metric	Description	Formula	Value Range	Monitoring Interval
Disk Usage	Calculates the disk usage of a CSS cluster. Unit: %	Used disk space of a cluster/Total disk space of a cluster	0 to 100%	1 minute
Cluster Health Status	Measures the health status of a CSS cluster.	-	Available values are 0, 1, and 2. 0: The cluster is 100% available. 1: The data is complete while some replicas are missing. Exceptions may occur because the high availability is compromised. This is a warning that should prompt investigation. 2: Data is missing and the cluster fails to work.	1 minute

Monitoring Metrics of Elasticsearch Clusters