[BUG]: KubeloginInstaller fails with Kubelogin version v0.x.x was not found

[PentlandOperations]

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Task name

KubeloginInstaller@0

Task version

0.259.2

Issue Description

We recently introduced the KubeloginInstaller task in our Azure DevOps pipelines.
In the beginning it seemed to run without issues, then people started to report problems that the KubeloginInstaller task failed and they had to re-run the pipeline. In the meanwhile this issue occurs more often and became an annoying issue because it seems to occur randomly and there's no meaningful error message in the logs.

As a workaround I added retryCountOnTaskFailure: "10", but this does not really help, only in rare situations.
Furthermore to avoid connection rate limits, I added a GiHub service connection, but still no luck, does not improve anything.

kublogin versions v0.2.8 and 'v0.2.10'.

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

Linux

Relevant log output

2025-09-15T15:26:53.0403912Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:26:53.0453320Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 10 out of 10) after 100000 ms

Full task logs with system.debug enabled

 2025-09-15T15:22:06.0438873Z ##[section]Starting: Install kubelogin
2025-09-15T15:22:06.0444195Z ==============================================================================
2025-09-15T15:22:06.0444357Z Task         : Kubelogin tool installer
2025-09-15T15:22:06.0444458Z Description  : Helps to install kubelogin
2025-09-15T15:22:06.0444558Z Version      : 0.259.2
2025-09-15T15:22:06.0444648Z Author       : Microsoft Corporation
2025-09-15T15:22:06.0444750Z Help         : https://azure.github.io/kubelogin/index.html
2025-09-15T15:22:06.0444861Z ==============================================================================
2025-09-15T15:22:06.2788530Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:22:06.2837881Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 1 out of 10) after 1000 ms
2025-09-15T15:22:07.4648616Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:22:07.4694601Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 2 out of 10) after 4000 ms
2025-09-15T15:22:11.6545825Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:22:11.6597754Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 3 out of 10) after 9000 ms
2025-09-15T15:22:20.8399534Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:22:20.8458357Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 4 out of 10) after 16000 ms
2025-09-15T15:22:37.0216709Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:22:37.0271844Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 5 out of 10) after 25000 ms
2025-09-15T15:23:02.2136356Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:23:02.2187310Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 6 out of 10) after 36000 ms
2025-09-15T15:23:38.4088442Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:23:38.4134237Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 7 out of 10) after 49000 ms
2025-09-15T15:24:27.5821528Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:24:27.5877009Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 8 out of 10) after 64000 ms
2025-09-15T15:25:31.7644147Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:25:31.7694223Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 9 out of 10) after 81000 ms
2025-09-15T15:26:53.0403912Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:26:53.0453320Z ##[warning]RetryHelper encountered task failure, will retry (attempt #: 10 out of 10) after 100000 ms
2025-09-15T15:28:33.2370556Z ##[error]Kubelogin version v0.2.10 was not found
2025-09-15T15:28:33.2425780Z ##[section]Finishing: Install kubelogin 

Repro steps

- task: KubeloginInstaller@0
  inputs:
    kubeloginVersion: 'v0.2.10'
    gitHubConnection: "GitHub-connection-name"
  displayName: 'Install kubelogin'
  retryCountOnTaskFailure: "10"

[egaudry]

+1

Interestingly, i haven't seen this problem with the previous task v0.259.1.

[scrgee]

The same issue:

Version : 0.259.2
[GET] https://api.github.com/repos/Azure/kubelogin/releases/latest
[debug] Feature flag USE_AUTHORIZATION_FOR_API_CALL not found. Returning false as default.
[debug] CLIENT_RESETSTREAMONRETRY=undefined
[debug] [GET]https://api.github.com/repos/Azure/kubelogin/releases/latest
[debug] cleaning: undefined
[debug] task result: Failed
[error] Cannot read properties of undefined (reading 'trim')

But after redeploy it successfully installed. The issue does not occur constantly, but only once in a while.

[egaudry]

seems this is a recurring issue, and a similar symptoms is described in #19097

[egaudry]

@Deekshitha981 something to check?

[Boryslav]

Same here. We use "latest" as version but behaviour is the same, starting last week it crashes quite often. Also use Microsoft hosted agents. Task retry usually doesn't help, only release redeploy helps, but not each time.

[v-schhabra]

Hi @Boryslav @egaudry @PentlandOperations
Does your pipeline contain the gitHubConnection property in the task inputs?
I believe the common problem is that your pipelines are making the unauthorized requests and it reached the GitHub REST API unauthorized requests limit.

If you don't have githubconnection property in your pipeline we can try two different approaches:

1. If pipelines contain latest version in kubeloginVersion property, then could you change it to the specific version?
2. If pipelines are making unauthorized requests, then could you link GH service connection gitHubConnection and enable the authorization call with the feature flag USE_AUTHORIZATION_FOR_API_CALL by passing it with variables in YAML as:

variables:

• name: USE_AUTHORIZATION_FOR_API_CALL
  value: true

[egaudry]

yes @v-schhabra it does have the gitHubConnection property, and this made no difference with the observed behavior (task 0.259.2) with or without this property.

[Boryslav]

Hi @v-schhabra,
My pipelines doesn't have gitHubConnection property in the task inputs. I mostly use KubernetesManifest@1 tasks apart of Kubelogin.
My observation is, this week I haven't noticed any failures of Kubelogin task. Will try specific version approach if issue will start happening again.
Thanks!

[v-schhabra]

yes @v-schhabra it does have the gitHubConnection property, and this made no difference with the observed behavior (task 0.259.2) with or without this property.

Then could you pls try enabling the FF (name: USE_AUTHORIZATION_FOR_API_CALL value: true) by adding a variable in the pipeline?

[PentlandOperations]

@v-schhabra
My pipeline has the gitHubConnection and a specific kubeloginVersion (v0.2.10).
The symptoms feel like "rate limits", even when the gitHubConnection is used. However, the error message is not clear in this regard.

I enabled the feature flag now by adding and env var to the task in my pipeline template, assuming this does the trick too here.

- task: KubeloginInstaller@0
  inputs:
    kubeloginVersion: ${{ parameters.kubeloginVersion }}
    gitHubConnection: ${{ parameters.githubConnection }}
  displayName: 'Install kubelogin'
  retryCountOnTaskFailure: "10"
  env:
    USE_AUTHORIZATION_FOR_API_CALL: 'true'

Will give it a try and monitor if it makes a difference.

[v-schhabra]

Hi @PentlandOperations
Do you have any updates here?

[v-schhabra]

Hi @PentlandOperations
Could you please share your latest updates here?