Modifying a Policy

Function

This API is used to modify a policy. Alarm policies can be modified, but scheduled and periodic policies cannot.

URI

PUT /v1/{project_id}/pe/policy/{policy_id}

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID.
policy_id	Yes	String	Policy ID.

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
Content-Type	Yes	String	Content type, which is application/json;charset=utf-8. Enumeration values: application/json;charset=utf-8 application/json
Cluster-Id	Yes	String	Cluster ID.
Namespace	Yes	String	Namespace.
Deployment-Name	Yes	String	Application name.
X-Auth-Token	Yes	String	Project-level token obtained from IAM.

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
id	Yes	String	Policy ID.
name	Yes	String	Policy name, which cannot be modified. The value must contain 1 to 64 characters starting with a letter. Only digits, letters, underscores (_), and hyphens (-) are allowed.
policy_type	Yes	String	Policy type. Currently, only ALARM policies are supported. Enumeration values: ALARM
rule	Yes	AlarmRule object	Policy trigger rule.
group_id	Yes	String	Policy group ID.

**Table 4** AlarmRule
Parameter	Mandatory	Type	Description
actions	Yes	Array of Action objects	Action executed after a specified policy is matched.
conditions	Yes	Array of AlarmConditions objects	Condition contents. A rule can contain multiple conditions in AND relationships. One condition describes the matching method of one metric.

**Table 5** Action
Parameter	Mandatory	Type	Description
type	Yes	String	scale_out_k8s and scale_out_vm indicate a scale-out. scale_in_k8s and scale_in_vm indicate a scale-in. Note: The value containing k8s indicates a scale-in or -out for containerized applications and that containing vm indicates a scale-in or -out for process applications. Enumeration values: scale_out_k8s scale_out_vm scale_in_k8s scale_in_vm
parameters	Yes	Array of Parameter objects	Number of scale-in or -out instances.

**Table 6** Parameter
Parameter	Mandatory	Type	Description
scale_unit	Yes	Integer	Number of scale-in or -out instances. The value is between the minimum number of instances to the maximum number of instances in a policy group.

**Table 7** AlarmConditions
Parameter	Mandatory	Type	Description
metric_namespace	Yes	String	Metric namespace. Enumeration values: PAAS.CONTAINER PAAS.CUSTOMMETRICS
metric_name	Yes	String	Metric name. Enumeration values: ^[a-zA-Z_:][a-zA-Z0-9_:]{0 254}$
metric_unit	Yes	String	Unit. Note: The value is retrieved from an AMS API and varies with the metric name.
period	Yes	Integer	Statistical period (unit: s). Enumeration values: 20 60 300 900 1800 3600
evaluation_periods	Yes	Integer	Number of consecutive periods. Enumeration values: 1 2 3 4 5
statistic	Yes	String	Statistic. Enumeration values: average
metric_operation	Yes	String	Metric operator. Option: > or <. For example, you can use > in a threshold criterion (when the value of a metric is greater than metric_thresholdUpdate) to trigger actions. Enumeration values: > <
metric_threshold	Yes	Integer	Threshold condition.

Response Parameters

Status code: 200

**Table 8** Response body parameters
Parameter	Type	Description
errorCode	String	Error code.
errorMessage	String	Details.
context	PePolicyContext object	Details about a modified policy.

**Table 9** PePolicyContext
Parameter	Type	Description
id	String	Policy ID.
name	String	Policy name, which cannot be modified. The value must contain 1 to 64 characters starting with a letter. Only digits, letters, underscores (_), and hyphens (-) are allowed.
policy_type	String	Policy type. Currently, only ALARM policies are supported. Enumeration values: ALARM
rule	AlarmRule object	Policy trigger rule.

**Table 10** AlarmRule
Parameter	Type	Description
actions	Array of Action objects	Action executed after a specified policy is matched.
conditions	Array of AlarmConditions objects	Condition contents. A rule can contain multiple conditions in AND relationships. One condition describes the matching method of one metric.

**Table 11** Action
Parameter	Type	Description
type	String	scale_out_k8s and scale_out_vm indicate a scale-out. scale_in_k8s and scale_in_vm indicate a scale-in. Note: The value containing k8s indicates a scale-in or -out for containerized applications and that containing vm indicates a scale-in or -out for process applications. Enumeration values: scale_out_k8s scale_out_vm scale_in_k8s scale_in_vm
parameters	Array of Parameter objects	Number of scale-in or -out instances.

**Table 12** Parameter
Parameter	Type	Description
scale_unit	Integer	Number of scale-in or -out instances. The value is between the minimum number of instances to the maximum number of instances in a policy group.

**Table 13** AlarmConditions
Parameter	Type	Description
metric_namespace	String	Metric namespace. Enumeration values: PAAS.CONTAINER PAAS.CUSTOMMETRICS
metric_name	String	Metric name. Enumeration values: ^[a-zA-Z_:][a-zA-Z0-9_:]{0 254}$
metric_unit	String	Unit. Note: The value is retrieved from an AMS API and varies with the metric name.
period	Integer	Statistical period (unit: s). Enumeration values: 20 60 300 900 1800 3600
evaluation_periods	Integer	Number of consecutive periods. Enumeration values: 1 2 3 4 5
statistic	String	Statistic. Enumeration values: average
metric_operation	String	Metric operator. Option: > or <. For example, you can use > in a threshold criterion (when the value of a metric is greater than metric_thresholdUpdate) to trigger actions. Enumeration values: > <
metric_threshold	Integer	Threshold condition.

Example Requests

Modify an alarm policy.

PUT https://{Endpoint}/v1/{project_id}/pe/policy/{policy_id}

{
  "group_id" : "943eba0f-b10a-4066-6261-1857a53500ff",
  "id" : "5c2eecea-32ac-42c0-be30-f73b15d68429",
  "name" : "policy_1",
  "policy_type" : "ALARM",
  "rule" : {
    "conditions" : [ {
      "metric_namespace" : "PAAS.CONTAINER",
      "metric_name" : "cpuUsage",
      "metric_unit" : "Percent",
      "period" : 60,
      "evaluation_periods" : 1,
      "statistic" : "average",
      "metric_operation" : ">",
      "metric_threshold" : 70
    } ],
    "actions" : [ {
      "type" : "scale_out_k8s",
      "parameters" : {
        "scale_unit" : 1
      }
    } ]
  }
}

Example Responses

Status code: 200

The request is successful.

{
  "errorCode" : "SVCSTG.PE.0",
  "errorMessage" : "",
  "context" : {
    "id" : "5c2eecea-32ac-42c0-be30-f73b15d68429",
    "name" : "policy_1",
    "policy_type" : "ALARM",
    "rule" : {
      "conditions" : [ {
        "metric_namespace" : "PAAS.CONTAINER",
        "metric_name" : "cpuUsage",
        "metric_unit" : "Percent",
        "period" : 60,
        "evaluation_periods" : 1,
        "statistic" : "average",
        "metric_operation" : ">",
        "metric_threshold" : 70
      } ],
      "actions" : [ {
        "type" : "scale_out_k8s",
        "parameters" : {
          "scale_unit" : 1
        }
      } ]
    }
  }
}

Status Codes

Status Code	Description
200	OK The request is successful.
400	Bad Request Invalid request. The client should not repeat the request without modifications.
401	Unauthorized The authorization information is incorrect or invalid.
403	ForbiddenThe request is rejected. The server has received the request and understood it, but the server refuses to respond to it. The client should not repeat the request without modifications.
500	Internal Server Error The server is able to receive the request but unable to understand the request.
503	Service Unavailable The requested service is invalid. The client should not repeat the request without modifications.