Auto Scaling:ModifyAlarm

The region ID of the event-triggered task.

The ID of the event-triggered task.

The name of the event-triggered task.

The description of the event-triggered task.

The name of the metric. The valid values vary based on the metric type.

• If you set the MetricType parameter to custom, the valid values are your custom metrics.

• If you set the MetricType parameter to system, the MetricName parameter has the following valid values:

  • CpuUtilization: the CPU utilization of an ECS instance. Unit: %.
  • IntranetTx: the outbound traffic over the internal network from an ECS instance. Unit: KB/min.
  • IntranetRx: the inbound traffic over the Internet to an ECS instance that resides in a virtual private cloud (VPC). Unit: KB/min.
  • VpcInternetTx: the outbound traffic over the Internet from an ECS instance that resides in a VPC. Unit: KB/min.
  • VpcInternetRx: the inbound traffic over the Internet to an ECS instance that resides in a VPC. Unit: KB/min.
  • SystemDiskReadBps: the number of bytes read from the system disk used by an ECS instance per second.
  • SystemDiskWriteBps: the number of bytes written to the system disk used by an ECS instance per second.
  • SystemDiskReadOps: the number of read operations on the system disk used by an ECS instance per second.
  • SystemDiskWriteOps: the number of write operations on the system disk used by an ECS instance per second.
  • CpuUtilizationAgent: the CPU utilization of an agent. Unit: %.
  • GpuMemoryFreeUtilizationAgent: the percentage of idle GPU memory of an agent.
  • GpuMemoryUtilizationAgent: the GPU memory usage of an agent. Unit: %.
  • MemoryUtilization: the memory usage of an agent. Unit: %.
  • LoadAverage: the average system load of an agent.
  • TcpConnection: the total number of TCP connections of an agent.
  • TcpConnection: the number of established TCP connections of an agent.
  • PackagesNetOut: the number of packets that are sent by the internal network interface controller (NIC) used by an agent.
  • PackagesNetIn: the number of packets that are received by the internal NIC used by an agent.
  • EciPodCpuUtilization: the CPU utilization of an elastic container instance. Unit: %.
  • EciPodMemoryUtilization: the memory usage of an elastic container instance. Unit: %.

For more information, see Event-triggered task for system monitoring.

The type of the metric. Valid values:

• system: system metrics of CloudMonitor
• custom: custom metrics that are reported to CloudMonitor

The period of time during which statistics about the metric is collected. Unit: seconds. Valid values:

• 15
• 60
• 120
• 300
• 900

The method that is used to aggregate statistics for the metric. Valid values:

• Average
• Minimum
• Maximum

The thresholds of the metric values in the multi-metric alert rule. If the thresholds are reached the specified number of times within the specified period, a scaling rule is executed.

The operator that is used to compare the metric value and the threshold. Valid values:

• If the metric value is greater than or equal to the threshold, set the value to >=.
• If the metric value is less than or equal to the threshold, set the value to <=.
• If the metric value is greater than the threshold, set the value to >.
• If the metric value is less than the threshold, set the value to <.

The number of times that the threshold must be reached before a scaling rule can be executed. For example, if you set this parameter to 3, the average CPU utilization must reach or exceed 80% three times in a row before a scaling rule is triggered.

The ID of the application group to which the custom metric belongs. If you set the MetricType parameter to custom, you must specify this parameter.

The effective period of the event-triggered task.

This parameter follows the cron expression format. The default format is X X X X X ?, in which:

• X: a placeholder for a field, which represents seconds, minutes, hours, days, and months in sequence. X can be a definite value or a special character that has logical meaning. For information about the valid values of X, see Cron expression.
• ?: No value is specified.

Examples:

• * * * * * ? : The event-triggered task is in effect all the time.
• * * 17-18 * * ? : The event-triggered task is in effect between 17:00 and 18:59 (UTC+8) every day.
• TZ=+00 * * 1-2 * * ?: The event-triggered task is in effect between 01:00 and 02:59 (UTC+0) every day.

The list of unique identifiers of the scaling rules that are associated with the event-triggered task.

Details of the dimensions.

The expressions that are specified in the multi-metric alert rule.

The relationship between the trigger conditions in the multi-metric alert rule. Valid values:

• &&: An alert is triggered only if all metrics in the multi-metric alert rule meet the trigger conditions. In this case, an alert is triggered only if the results of all trigger conditions that are specified in the multi-metric alert rule are true.
• ||: An alert is triggered if one of the metrics in the multi-metric alert rule meets the trigger condition.

Default value: &&.