[Bug]: Runbook missing for KubeContainerRestarts alert

[SudharsaneSivamany]

What happened?

For the KubeContainerRestarts alert, runbook url is not exist to guide how to resolve/troubleshoot . Could someone please add the runbookUrl as below.

https://github.com/kubernetes-monitoring/kubernetes-mixin/tree/master/runbook.md#alert-name-kubeContainerRestarts

Please provide any helpful snippets.

What parts of the codebase are affected?

Alerts

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