Use GetContextLogs to query contextual logs - Simple Log Service

Operation description

Usage notes

You can specify a log as the start log. The time range of a contextual query is one day before and one day after the generation time of the start log.
Host consists of a project name and a Simple Log Service endpoint. You must specify a project in Host.
An AccessKey pair is created and obtained. For more information, see AccessKey pair.

The AccessKey pair of an Alibaba Cloud account has permissions on all API operations. Using these credentials to perform operations in Simple Log Service is a high-risk operation. We recommend that you use a Resource Access Management (RAM) user to call API operations or perform routine O&M. To create a RAM user, log on to the RAM console. Make sure that the RAM user has the management permissions on Simple Log Service resources. For more information, see Create a RAM user and authorize the RAM user to access Simple Log Service.

The information that is required to query logs is obtained. The information includes the name of the project to which the logs belong, the region of the project, and the name of the Logstore to which the logs belong. For more information, see Manage a project and Manage a Logstore.
Indexes are configured before you query logs. For more information, see Create indexes.
The values of the pack_id and pack_meta fields are obtained before you query logs. The fields are internal fields, and you can obtain the values by using the debugging feature of your browser in the Simple Log Service console.

Authentication resources

The following table describes the authorization information that is required for this operation. You can add the information to the Action element of a RAM policy statement to grant a RAM user or a RAM role the permissions to call this operation.

Action	Resource
`log:GetLogStoreContextLogs`	`acs:log:{#regionId}:{#accountId}:project/{#ProjectName}/logstore/{#LogstoreName}`

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Test

RAM authorization

No authorization for this operation. If you encounter issues with this operation, contact technical support.

Request syntax

GET /logstores/{logstore}?type=context_log HTTP/1.1

Path Parameters

Parameter	Type	Required	Description	Example
logstore	string	Yes	The name of the Logstore.	test-logstore

Request parameters

Parameter	Type	Required	Description	Example
project	string	Yes	The name of the project.	ali-test-project
pack_id	string	Yes	The unique identifier of the log group to which the start log belongs.	85C897C740352DC6-808
pack_meta	string	Yes	The unique context identifier of the start log in the log group.	2\|MTY1NTcwNTUzODY5MTY0MDk1Mg==\|3\|0
back_lines	integer	Yes	The number of logs that you want to obtain and are generated before the generation time of the start log. Valid values: `(0,100]`.	10
forward_lines	integer	Yes	The number of logs that you want to obtain and are generated after the generation time of the start log. Valid values: `(0,100]`.	10

Response elements

Element	Type	Description	Example
	object	Schema of Response
total_lines	integer	The total number of logs that are returned. The logs include the start log that is specified in the request.	201
back_lines	integer	The number of logs that are generated before the generation time of the start log.	100
forward_lines	integer	The number of logs that are generated after the generation time of the start log.	100
progress	string	Indicates whether the query and analysis results are complete. Valid values: Complete: The query is successful, and the complete query and analysis results are returned. Incomplete: The query is successful, but the query and analysis results are incomplete. To obtain the complete results, you must repeat the request.	Complete
logs	array<object>	The logs that are returned.
	object	The logs that are returned. The logs are arranged in contextual order. If no contextual logs are found based on the specified start log, this parameter is empty.	{ "__index_number__": "-100", "__tag__:__pack_id__": "895CEA449A52FE-8c8", "__pack_meta__": "0\|MTU1OTI4NTExMjg3NTQ2NDU1OA==\|4\|1"}

The logs parameter contains log content and the following fields that are formatted in key-value pairs.

Field	Type	Example	Description
`__index_number__`	String	-100	The position of the log in the context. A negative value indicates that the log is generated before the generation time of the start log. The value 0 indicates that the log is the start log. A positive value indicates that the log is generated after the generation time of the start log. For example, the value -100 indicates that the log is the 100th log before the generation time of the start log.
`__tag__:__pack_id__`	String	895CEA449A52FE-8c8	The unique identifier of the log group to which the log belongs. The identifier can be used as the value of the pack_id parameter in the request.
`__pack_meta__`	String	`0	MTU1OTI4NTExMjg3NTQ2NDU1OA==

Examples

Success response

JSON format

{
  "total_lines": 201,
  "back_lines": 100,
  "forward_lines": 100,
  "progress": "Complete",
  "logs": [
    {
      "__index_number__": "-100",
      "__tag__:__pack_id__": "895CEA449A52FE-8c8",
      "__pack_meta__": "0|MTU1OTI4NTExMjg3NTQ2NDU1OA==|4|1"
    }
  ]
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.