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Related Services

Elastic Load Balancing (ELB)

After ELB is configured, AS automatically binds instances to the load balancer when adding instances, and unbinds instances from the load balancer when removing instances.

Elastic Cloud Server (ECS)

The instances added in a scaling action can be managed and maintained on the ECS console.

Cloud Trace Service (CTS)

The provisioned CTS service records AS operation logs for view, audit, and backtracking.

Cloud Eye

If an alarm-triggered policy is configured, AS triggers scaling actions when an alarm triggering condition specified in Cloud Eye is met. Table 1 lists the AS metrics supported by Cloud Eye.

Table 1 AS metrics

Metric

Description

Formula

Description

CPU Usage

CPU usage (%) of an AS group

CPU usage of all instances in an AS group/Number of vCPUs of all instances in the AS group

N/A

Memory Usage

Memory usage (%) of an AS group

Used memory of all instances in an AS group/Total memory of all instances in the AS group

This metric is unavailable if the image has no OTC Tools installed.

Number of Instances

Number of available instances in an AS group

Total number of ECSs in Enabled state in the AS group

N/A

Inband Incoming Rate

Number of incoming bytes summarized over the instances in an AS group per second

(Total number of inband incoming bytes summarized over all instances in an AS group/Total number of instances in the AS group)/Monitoring period

N/A

Inband Outgoing Rate

Number of outgoing bytes summarized over the instances in an AS group per second

(Total number of inband outgoing bytes summarized over all instances in an AS group/Total number of instances in the AS group)/Monitoring period

N/A

Disks Read Rate

Number of bytes read from all instances in an AS group per second

(Total number of bytes read from all instances in an AS group/Total number of instances in the AS group)/Monitoring period

N/A

Disks Write Rate

Number of bytes written to all instances in an AS group per second

(Total number of bytes written to all instances in an AS group/Total number of instances in the AS group)/Monitoring period

N/A

Disks Read Requests

Number of read requests sent to all instances in an AS group per second

(Total number of read requests sent to all instances in an AS group/Total number of instances in the AS group)/Monitoring period

N/A

Disks Write Requests

Number of write requests sent to all instances in an AS group per second

(Total number of write requests sent to all instances in an AS group/Total number of instances in the AS group)/Monitoring period

N/A

NOTE:
  • The image based on which the target ECS is created must have OTC Tools installed. Otherwise, Memory Usage will be unavailable. For details about how to install the OTC Tools, visit https://github.com/UVP-Tools/UVP-Tools/.
  • For details about whether your OS supports the Memory Usage, Inband Outgoing Rate, and Inband Incoming Rate metrics, see Elastic Cloud Server User Guide.