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

You would first need to import the cluster to be managed by Pulumi. See <https://www.pulumi.com/docs/guides/adopting/import/|https://www.pulumi.com/docs/guides/adopting/import/>. 

You could then update the infrastructure by making changes in Pulumi. 

Note that the resource(s) will be completely managed by Pulumi, so (a) if you destroy them in Pulumi it will delete the cluster (so you may want to `protect` the resource) and (b) if you continue to also make changes to the cluster outside Pulumi, you will need to `refresh` to ensure Pulumi stays consistent with those changes. 