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Machine Runner Orchestrator Release 1.0.0

New

Machine Runner Orchestrator (previously Machine Provisioner), which automatically scales self-hosted machine runner VMs to match CI demand, is now generally available (GA).

Machine Runner Orchestrator adds:

  • Multi-resource-class support: CPU, GPU, and ARM workloads can all autoscale from a single deployment, removing the single-resource-class limit from the preview release.
  • CLI and API controls for queue pause/resume and graceful agent draining before scale-down.
  • A Prometheus-compatible metrics endpoint, so you can wire fleet health into monitoring you already run.
  • Support for GKE, AKS, and EKS, in addition to any KubeVirt-based Kubernetes cluster.

Runner Provisioner is included with self-hosted runners on every CircleCI plan, at no additional cost.

Breaking

The product was fully renamed from runner-provisioner to machine-runner-orchestrator: Helm chart name, container image repository, and Packagecloud package repository all changed to reflect that. Existing deployments must be uninstalled and reinstalled under the new name.

helm list -n <k8s_namespace>
helm uninstall runner-provisioner -n <k8s_namespace>
helm repo add circleci_machine-runner-orchestrator https://packagecloud.io/circleci/machine-runner-orchestrator/helm
helm repo update
helm install machine-runner-orchestrator circleci_machine-runner-orchestrator/machine-runner-orchestrator \
  --namespace <k8s_namespace> \
  --version 1.0.0 \
  --values my-values.yaml

Keep in mind that Runners for the configured resource classes will be offline between uninstalling the old chart and installing the new one.

Security

This version patches two high-severity gRPC-Go denial-of-service vulnerabilities: heap memory exhaustion via HTTP/2 frame fragmentation (CVE-2026-84304) and a crash on requests missing :authority/Host headers (CVE-2026-84445).

Runner