DescribeMetricLast

Queries the latest monitoring data of a metric.

Limits

The total free quota is 1 million calls per month for the DescribeMetricLast, DescribeMetricList, DescribeMetricData, and DescribeMetricTop operations. If the free quota is used up and CloudMonitor Basic (pay-as-you-go) is not activated, these API operations can no longer be called as expected. If you have activated CloudMonitor Basic (pay-as-you-go), these API operations can still be called even if the free quota is used up. After the free quota is used up, you are charged for the excess usage based on the pay-as-you-go billing method. For more information about how to activate CloudMonitor Basic (pay-as-you-go), see Enable the pay-as-you-go billing method.
Each API operation can be called up to 50 times per second. An Alibaba Cloud account and the Resource Access Management (RAM) users within the account share the quota.

Note

If Throttling.User or Request was denied due to user flow control is returned when you call an API operation, the API operation is throttled. For more information about how to handle the issue, see How do I handle the throttling of a query API?

Precautions

The storage duration of the monitoring data of each cloud service is related to the Period parameter (statistical period). A larger value of the Period parameter indicates that the monitoring data is distributed in a larger time range and the storage duration of the monitoring data is longer. The following list describes the specific relationships:

The storage duration is 7 days if the value of the Period parameter is less than 60 seconds.
The storage duration is 31 days if the value of the Period parameter is 60 seconds.
The storage duration is 91 days if the value of the Period parameter is greater than or equal to 300 seconds.

Operation description

This topic provides an example on how to query the latest monitoring data of the CPUUtilization metric for Elastic Compute Service (ECS). The namespace of ECS is acs_ecs_dashboard. The returned result indicates that the monitoring data for the instance i-abcdefgh12**** of the account 123456789876**** is queried at an interval of 60 seconds. The maximum, minimum, and average values of the metric are 100, 93.1, and 99.52.

Debugging

You can run this interface directly in OpenAPI Explorer, saving you the trouble of calculating signatures. After running successfully, OpenAPI Explorer can automatically generate SDK code samples.

Debug

Authorization information

The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:

Operation: the value that you can use in the Action element to specify the operation on a resource.
Access level: the access level of each operation. The levels are read, write, and list.
Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
- For mandatory resource types, indicate with a prefix of * .
- If the permissions cannot be granted at the resource level, All Resources is used in the Resource type column of the operation.
Condition Key: the condition key that is defined by the cloud service.
Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.

Operation	Access level	Resource type	Condition key	Associated operation

Operation	Access level	Resource type	Condition key	Associated operation
cms:QueryMetricLast	get	All Resources ``	none	none

Request parameters

Parameter	Type	Required	Description	Example

Parameter	Type	Required	Description	Example
Namespace	string	Yes	The namespace of the cloud service. For more information about the namespaces of cloud services, see Appendix 1: Metrics.	acs_ecs_dashboard
MetricName	string	Yes	The metric that is used to monitor the cloud service. For more information about metric names, see Appendix 1: Metrics.	CPUUtilization
Period	string	No	The statistical period of the monitoring data. Valid values: 15, 60, 900, and 3600. Unit: seconds. Note If this parameter is not specified, monitoring data is queried based on the period in which metric values are reported. The statistical period of metrics (`MetricName`) varies for each cloud service. The statistical period of metrics is displayed in the `MinPeriods` column on the Metrics page for each cloud service. For more information, see Appendix 1: Metrics.	60
StartTime	string	No	The start of the time range to query monitoring data.	2019-01-31 10:00:00
EndTime	string	No	The end of the time range to query monitoring data. For second-level data, the start time is obtained by comparing the time that is specified by the StartTime parameter and 20 minutes earlier of the time that is specified by the EndTime parameter. The earlier one of the compared points in time is used as the start time. For minute-level data, the start time is obtained by comparing the time that is specified by the StartTime parameter and 2 hours earlier of the time that is specified by the EndTime parameter. The earlier one of the compared points in time is used as the start time. For hour-level data, the start time is obtained by comparing the time that is specified by the StartTime parameter and two days earlier of the time that is specified by the EndTime parameter. The earlier one of the compared points in time is used as the start time.	2019-01-31 10:10:00
Dimensions	string	No	The monitoring dimensions of the specified resource. Set the value to a collection of `key:value` pairs. Example: `{"userId":"120886317861**"}` or `{"instanceId":"i-2ze2d6j5uhg20x47"}`. Note** You can query a maximum of 50 instances in each request.	[{"instanceId":"i-abcdefgh12****"}]
NextToken	string	No	The pagination token. If the number of results exceeds the maximum number of entries allowed on a single page, a pagination token is returned. This token can be used as an input parameter to obtain the next page of results. If all results are obtained, no token is returned.	15761432850009dd70bb64cff1f0fff6c0b08ffff073be5fb1e785e2b020f7fed9b5e137bd810a6d6cff5ae****
Length	string	No	The number of entries per page. Default value: 1000. This value indicates that a maximum of 1,000 entries of monitoring data can be returned on each page. Note The maximum value of the Length parameter for each request is 1440.	1000
Express	string	No	The expression that is used to calculate the query results in real time.	{"groupby":["userId","instanceId"]}

For more information about common request parameters, see Common parameters.

Response parameters

Parameter	Type	Description	Example

Parameter	Type	Description	Example
	object
NextToken	string	The pagination token.	xxxxxx
RequestId	string	The request ID.	021472A6-25E3-4094-8D00-BA4B6A5486C3
Success	boolean	Indicates whether the request was successful. Valid values: true false	true
Datapoints	string	The monitoring data.	[{"timestamp":1548777660000,"userId":"123456789876**","instanceId":"i-abcdefgh12**","Minimum":93.1,"Average":99.52,"Maximum":100}]
Code	string	The HTTP status code. Note The status code 200 indicates that the request was successful.	200
Message	string	The error message.	The specified resource is not found.
Period	string	The time interval. Unit: seconds.	60

Examples

Sample success responses

JSONformat

            
            
          
{
  "NextToken": "xxxxxx",
  "RequestId": "021472A6-25E3-4094-8D00-BA4B6A5486C3",
  "Success": true,
  "Datapoints": "[{\"timestamp\":1548777660000,\"userId\":\"123456789876****\",\"instanceId\":\"i-abcdefgh12****\",\"Minimum\":93.1,\"Average\":99.52,\"Maximum\":100}]",
  "Code": "200",
  "Message": "The specified resource is not found.",
  "Period": "60"
}

Error codes

HTTP status code	Error code	Error message	Description

HTTP status code	Error code	Error message	Description
400	ParameterInvalid	Illegal parameters.	-
403	AccessForbidden	User not authorized to operate on the specified resource.	-
404	ResourceNotFound	The specified resource is not found.	The specified resource is not found.
500	InternalError	The request processing has failed due to some unknown error.	-

For a list of error codes, visit the Service error codes.

Change history

Change time	Summary of changes	Operation

Change time	Summary of changes	Operation

No change history