Maintainer of jsonnet-bundler, kube-prometheus and some monitoring mixins, that are all based on jsonnet, here:

Currently we're mostly keeping a close look at CUE, but not really using it as of right now. However, during the holiday break I've been trying to get into CUE again and there are some things I need to figure out before being able to tell how to incorporate or replace some of our jsonnet projects with CUE, if we really want that.

Some parts of CUE seem like an obvious improvement to what jsonnet currently offers. So 2020 will be exciting in that regard.

On the same track as well! CUE looks exciting and we might very much implement add it to Tanka when it proves to be useful.

We have chosen Jsonnet because it already had an ecosystem and served us well, but Tanka is open to other languages as well

It's still early, but incredibly exciting. I personally am betting on CUE as the "winner" in this space. Its creator is enormously credible. Most of the other configuration languages in this space are directly inspired by his work. So for him to work on something new is significant.

I am also impressed by the clip at which CUE is improving, and how useful it already is, in spite of its relatively young age. It reminds me of Python or Go in its focus on tooling quality, and stability.

Their community slack is very welcoming, too. https://cuelang.slack.com

For those who don't already have an account on that slack, then going to https://cuelang.org/community/ appears to be the place one will find the magic invite link: https://join.slack.com/t/cuelang/shared_invite/enQtNzQwODc3N...

off(but actually on)-topic: I can't wait for the use of slack for open source communities to die in a fire, not only because the onboarding experience is horrible, and search is a mess, but about 75% of them appear to be the non-paid flavor so old messages are just held for ransom

I completely agree with you on slack for open-source projects. Especially with Mattermost being so good, there’s no good reason for a project to stick to Slack.

Even Mattermost doesn't offer free accounts to open source projects[1], and I think it's the _hosting_ that keeps projects off of almost any of the open source solutions. But one of the principals of Zulip almost always weighs in on discussions to point out that they have free hosting for any open source project that wants to use it: https://zulipchat.com/for/open-source/#free-hosting-at-zulip... and seem to even offer "import from slack" to make it less painful to switch.

1 = https://mattermost.com/nonprofit/ asks for a $390 "setup fee" and only for 1,000 users

I am using it for k8s deployment and overall am quite happy that I can safely configure deployments without boilerplate. The k8s integration makes it easy to get started with, including using existing yaml configuration. Certainly though you have to invest some time to learn it and I have discovered a few rough edges.

I haven't seen another appealing solution in the space. I recommend using Kustomize if you can, but it is very limited in what you can do with it. When I looked at dhall-kubernetes it was lacking some crucial defaulting features that are getting integrated into the language now.