Updated on 2025-08-21 GMT+08:00

Querying the Log Histogram

Function

This API is used to query the number of logs that contain a specified keyword. It helps you query and collect statistics on logs in a specified period, including the number of logs that contain the keyword and the reporting details of each log.

Calling Method

For details, see Calling APIs.

URI

POST /v2/{project_id}/lts/keyword-count

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Definition

Project ID. It can be obtained by calling an API or from the console. For details, see Obtaining a Project ID.

Constraints

N/A

Range

N/A

Default Value

N/A

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

Definition

User token obtained from IAM. For details about how to obtain it, see Obtaining a User Token.

Constraints:

N/A

Range

N/A

Default Value

N/A

Content-Type

Yes

String

Definition

Message body format. Set this parameter to application/json;charset=utf8.

Constraints

N/A

Range

N/A

Default Value

N/A

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

start_time

Yes

String

Definition

Start time for searching for logs by time range. Log time refers to the time when a log is written.

The time range between start_time and end_time includes both the start time and end time.

Constraints

  • The maximum time range for a query is 180 days.

  • The values of start_time and end_time must be different.

Range

The value must be a timestamp, measured in milliseconds from January 1, 1970, 00:00:00 UTC.

Default Value

N/A

end_time

Yes

String

Definition

End time for searching for logs by time range. Log time refers to the time when a log is written.

The time range between start_time and end_time includes both the start time and end time.

Constraints

  • The maximum time range for a query is 180 days.

  • The values of start_time and end_time must be different.

Range

The value must be a timestamp, measured in milliseconds from January 1, 1970, 00:00:00 UTC.

Default Value

N/A

step_interval

Yes

Long

Definition

Time step, in milliseconds.

Recommended formula:

(end_timestart_time)/1,000 x 1,000/60, where /1,000 x 1,000 means rounding to an integer.

Constraints

If the calculated result is less than or equal to 1,000, the value 1,000 is used.

Range

Minimum value: 1000

Default Value

N/A

group_id

Yes

String

Definition

Log group ID.

Constraints:

N/A

Range

N/A

Default Value

N/A

stream_id

Yes

String

Definition

Log stream ID.

Constraints:

N/A

Range

N/A

Default Value

N/A

key_word

Yes

String

Definition

Keyword used for log search. A keyword is a word between two adjacent delimiters. Example: error

Constraints

N/A

Range

N/A

Default Value

N/A

is_iterative

No

Boolean

Definition

Whether to enable the log iterative query function.

Constraints

N/A

Range

  • true: enables iterative query, returning query results in batches. This mode is applicable for querying a large volume of log data.

  • false: disables iterative query, returning all query results in a single response. This mode is suitable for a small volume of logs.

Default Value

false

Response Parameters

Status code: 200

Table 4 Response body parameters

Parameter

Type

Description

count

Long

Definition

Number of log events.

Range

N/A

histogram

String

Definition

Histogram result.

Range

N/A

isQueryComplete

Boolean

Definition

Whether the query is complete.

Range

  • true: The query is complete.

  • false: The query is not complete.

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

error_code

String

Definition

Error code. For details, see Error Codes.

Range

N/A

error_msg

String

Definition

Error message.

Range

N/A

Status code: 500

Table 6 Response body parameters

Parameter

Type

Description

error_code

String

Definition

Error code. For details, see Error Codes.

Range

N/A

error_msg

String

Definition

Error message.

Range

N/A

Example Requests

Query a log histogram.

POST https://{endpoint}/v2/{project_id}/lts/keyword-count

{
  "group_id" : "00330565-5baf-4e0d-bd16-ba0c6b951d9a",
  "stream_id" : "715cda3b-e17f-492a-a6ca-98a1ba16ad8c",
  "end_time" : 1637820813605,
  "start_time" : 1637817213605,
  "key_word" : "test",
  "step_interval" : 6000
}

Example Responses

Status code: 200

The request for querying histogram data is successful.

{
  "count" : 1,
  "histogram" : [ {
    "num" : 1,
    "startTime" : 1637821594579,
    "endTime" : 1637821595000
  }, {
    "num" : 0,
    "startTime" : 1637821654000,
    "endTime" : 1637821654579
  } ]
}

Status code: 400

Invalid request. Modify the request based on the description in error_msg before a retry.

{
  "error_code" : "LTS.0601",
  "error_msg" : "must be less than or equal to 86400000"
}

SDK Sample Code

The SDK sample code is as follows.

Query a log histogram.

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.lts.v2.region.LtsRegion;
import com.huaweicloud.sdk.lts.v2.*;
import com.huaweicloud.sdk.lts.v2.model.*;


public class ListLogHistogramSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        LtsClient client = LtsClient.newBuilder()
                .withCredential(auth)
                .withRegion(LtsRegion.valueOf("<YOUR REGION>"))
                .build();
        ListLogHistogramRequest request = new ListLogHistogramRequest();
        QueryLogKeyWordCountRequestBody body = new QueryLogKeyWordCountRequestBody();
        body.withKeyWord("test");
        body.withStreamId("715cda3b-e17f-492a-a6ca-98a1ba16ad8c");
        body.withGroupId("00330565-5baf-4e0d-bd16-ba0c6b951d9a");
        body.withStepInterval(6000L);
        body.withEndTime("1637820813605");
        body.withStartTime("1637817213605");
        request.withBody(body);
        try {
            ListLogHistogramResponse response = client.listLogHistogram(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

Query a log histogram.

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdklts.v2.region.lts_region import LtsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdklts.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = LtsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(LtsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ListLogHistogramRequest()
        request.body = QueryLogKeyWordCountRequestBody(
            key_word="test",
            stream_id="715cda3b-e17f-492a-a6ca-98a1ba16ad8c",
            group_id="00330565-5baf-4e0d-bd16-ba0c6b951d9a",
            step_interval=6000,
            end_time="1637820813605",
            start_time="1637817213605"
        )
        response = client.list_log_histogram(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Query a log histogram.

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    lts "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := lts.NewLtsClient(
        lts.LtsClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ListLogHistogramRequest{}
	request.Body = &model.QueryLogKeyWordCountRequestBody{
		KeyWord: "test",
		StreamId: "715cda3b-e17f-492a-a6ca-98a1ba16ad8c",
		GroupId: "00330565-5baf-4e0d-bd16-ba0c6b951d9a",
		StepInterval: int64(6000),
		EndTime: "1637820813605",
		StartTime: "1637817213605",
	}
	response, err := client.ListLogHistogram(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code

Description

200

The request for querying histogram data is successful.

400

Invalid request. Modify the request based on the description in error_msg before a retry.

500

The server has received the request but encountered an internal error.

Error Codes

See Error Codes.