No matter how you like to participate in developer communities, Pulumi wants to meet you there. If you want to meet other Pulumi users to share use-cases and best practices, contribute code or documentation, see us at an event, or just tell a story about something cool you did with Pulumi, you are part of our community.

Pulumi Community

No, not built in: that's one of the incentives to use the Pulumi back-end. You would need to wrap calls to `pulumi up` with your locking mechanism. (And probably do it within your Pulumi app too, to minimize risk of race conditions.)