Add tutorial - Cost-optimal Kubernetes autoscaling on Hetzner Cloud with Karpenter

[stubbi]

New tutorial

Cost-optimal Kubernetes autoscaling on Hetzner Cloud with Karpenter

tutorials/kubernetes-autoscaling-hetzner-karpenter/01.en.md

This tutorial walks through installing Karpenter and the open-source Karpenter provider for Hetzner on an existing Kubernetes cluster running on Hetzner Cloud. Karpenter watches for unschedulable pods, launches the cheapest Hetzner server that fits them, and consolidates idle nodes away so the cluster tracks demand instead of fixed node pools.

It covers:

• Storing the Hetzner Cloud API token in a Secret
• Installing Karpenter's CRDs and the Hetzner provider Helm chart
• Providing a worker bootstrap Secret (kubeadm or Talos)
• Defining an HCloudNodeClass and a NodePool
• Watching a node provision on demand and consolidate away
• An optional Arm (CAX) node pool for cheaper capacity

I have read and understood the Contributor's Certificate of Origin, as included at the bottom of the tutorial, and I certify that this contribution complies with it.

Signed-off-by: Jannes Stubbemann jannes.stubbemann@gmail.com

[stubbi]

Thanks for the review @maximilianfeix! Addressed in 5645aad:

• author_link now points to the GitHub profile URL: https://github.com/stubbi
• author_img now uses the GitHub avatars URL format: https://avatars3.githubusercontent.com/u/24454679

The front-matter field order already follows the tutorial template (SPDX → path → slug → date → title → short_description → tags → author → author_link → author_img → author_description → language → available_languages → header_img → cta). Let me know if anything else needs adjusting.

[stubbi]

Hi @maximilianfeix, friendly nudge on this one — all three review points are addressed in 5645aad (GitHub author_link, avatars3 author_img, and front-matter order matching tutorial-template.md). Whenever you have a moment for a re-review I'd really appreciate it. Thanks!

[maximilianfeix]

Hello @stubbi,
I'll review your pull request in the coming days.

[svenja11]

The tutorial looks good now. Thank you for your contribution @stubbi!

[stubbi]

Amazing, thank you! 🤗