[Alert manager] k8s cert expiration checker

[yiyione]

#5334

[suiguoxin]

Could you provide some documents to the end of this file : https://github.com/microsoft/pai/blob/master/docs/manual/cluster-admin/how-to-use-alert-system.md

[yiyione]

Could you provide some documents to the end of this file : https://github.com/microsoft/pai/blob/master/docs/manual/cluster-admin/how-to-use-alert-system.md

Added.

[siaimes]

Could you provide some documents to the end of this file : https://github.com/microsoft/pai/blob/master/docs/manual/cluster-admin/how-to-use-alert-system.md

Added.

This feature will be enable by default, if the action email-admin is enabled.
You can configure the alert-manager->cert-expiration-checker field in services-configuration.yml.
schedule, alert-residual-days and cert-path are necessary fields for this feature, and we have default value for the fields.

Hi, @yiyione

I have some doubts about this description. Is the warning message not sent to the upper right corner of the homepage? If the warning message is sent to the upper right corner of the homepage, can I use this feature without setting up a mail server?

Thanks.

[siaimes]

kubernetes/kubernetes/pull/52196

In addition, I found a PR in the kubernetes repository that seems to fix the problem. Is this PR in this repository still necessary?

[Binyang2014]

@siaimes Nice catch! We don't notice this feature. For this release, we will still use this PR. After we verified this feature, this PR can revert. Thanks for this notice!

[yiyione]

Hi, @yiyione

I have some doubts about this description. Is the warning message not sent to the upper right corner of the homepage? If the warning message is sent to the upper right corner of the homepage, can I use this feature without setting up a mail server?

Thanks.

It's a good question, and we are going to fix it.
After the PR #5440 merged, the admin will be able to view the alert on the upper right corner of the homepage without setting up the email.

Thanks.