Not sure where you got the information that the atomic flag doesn’t exist in Helm 3. I just checked, and it’s been there since Helm 3.0.0, and it’s present in HEAD.

https://github.com/helm/helm/blob/v3.0.0/cmd/helm/install.go#L140

https://github.com/helm/helm/blob/master/cmd/helm/install.go#L149

If you want to automatically roll back in case of a failure, you can use the atomic flag. I’m not aware of another feature to handle rollbacks.

From: cncf-helm@... <cncf-helm@...> on behalf of vtejaswini1 via lists.cncf.io <vtejaswini1=gmail.com@...>
Sent: Wednesday, July 1, 2020 10:00 AM
To: cncf-helm@... <cncf-helm@...>
Subject: [cncf-helm] How can we achieve automatic rollback in case of "helm upgrade" failures?

Hi,

Does anyone have ideas about supporting automatic rollback in terms of failures? Over slack, people recommend different sets of tools. What is the recommended approach or best feasible approach to use?

Do I need to use any helm operator or?

I also notice helm3 not supporting the atomic flag, which was created to support automatic rollback.

Thanks,
Teja