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You mean Pulumi instance `2` should fail fast if another instance `1` currently applies on the same stack? If so, also if it’s just a preview?

I’m also interested in both options.

im interested in checking if something is applying before I my job applys. Can then decide if I want to cancel the old, wait till read, then go. or just cancel the new update

If you’re using the Pulumi Service backend, Pulumi will automatically exit with a message when another update is in progress on the same stack. 