logGroupNamePattern field in DescribeLogGroupsCommand (SDK v3) does not filter correctly

[covertbert]

Checkboxes for prior research

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

Since trying to update my application from using v2 of the SDK to v3, the logGroupNamePattern field for DescribeLogGroupsCommand returns log groups that do not match the given string

SDK version number

@aws-sdk/client-cloudwatch-logs 3.418.0

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

NodeJS v18.18.0

Reproduction Steps

Using the following code in an environment where there are log groups that match the given pattern and also log groups that do not:

new DescribeLogGroupsCommand({
  logGroupNamePattern: '-ephemeral-',
})

Observed Behavior

The log groups with the following names are returned:

/aws/lambda/diego-sit-event
/aws/lambda/diego-sit-updateMongodbIndexes
/aws/lambda/diego-uat-api
/aws/lambda/diego-uat-direct

Expected Behavior

I would expect none of the following log group names to be returned:

/aws/lambda/diego-sit-event
/aws/lambda/diego-sit-updateMongodbIndexes
/aws/lambda/diego-uat-api
/aws/lambda/diego-uat-direct

Possible Solution

No response

Additional Information/Context

No response

[ajredniwja]

Hey @covertbert, thanks for opening this issue, however I am not able to reproduce your issue. Are there any more specifics from your use case that may affect the response?
I used the code like this which returns the right data on the similar version of @aws-sdk/client-cloudwatch-logs

import { CloudWatchLogsClient, DescribeLogGroupsCommand } from "@aws-sdk/client-cloudwatch-logs";

(async() => {
    try {
        const client = new CloudWatchLogsClient({});
        const params = {
            logGroupNamePattern: "something-that-matches", //tried to play with different values too
        };
        const command = new DescribeLogGroupsCommand(params);
        const response = await client.send(command);

        console.log(response);
    } catch (error) {
        console.log(error);
    }
})();

[covertbert]

Not sure what else to say other than your code doesn't work for me.

I copied your code exactly and just tweaked the pattern string (and change params to parameters to satisfy our eslint):

import {
  CloudWatchLogsClient,
  DescribeLogGroupsCommand,
} from '@aws-sdk/client-cloudwatch-logs'

  const client = new CloudWatchLogsClient({})
  const parameters = {
    logGroupNamePattern: '-ephemeral-',
  }
  const command = new DescribeLogGroupsCommand(parameters)
  const { logGroups } = await client.send(command)

  logGroups?.forEach(group => {
    console.log(group.logGroupName)
  })

This code is running in a lambda and the lambda output is this:

2023-09-27T14:45:27.169Z	d5dbd88a-2172-4359-b835-73c799932818	INFO	/aws/lambda/diego-oat-direct
2023-09-27T14:45:27.169Z	d5dbd88a-2172-4359-b835-73c799932818	INFO	/aws/lambda/diego-oat-event
2023-09-27T14:45:27.169Z	d5dbd88a-2172-4359-b835-73c799932818	INFO	/aws/lambda/diego-sit-api
2023-09-27T14:45:27.169Z	d5dbd88a-2172-4359-b835-73c799932818	INFO	/aws/lambda/diego-sit-direct
...

As far as I'm aware, the pattern just shouldn't match any of these log group names.

Is there anything else I can give you to help you debug?

[ajredniwja]

You mentioned upgrading from v2, do you get similar results for v2 as well, and are these all the log groups present ?

[covertbert]

You mentioned upgrading from v2, do you get similar results for v2 as well, and are these all the log groups present ?

With v2 it works correctly so these log groups get filtered out. It's in the same AWS account using the same string as a filter so I think I should be seeing identical behaviour.