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Butler Releases

Release history and changelog for the Butler Kubernetes-as-a-Service platform.

Component Versions​

ComponentLatestTypeReleased
butler-api
CRD type definitions (the API contract)
0.17.0moduleMay 8, 2026
butler-controller
Core reconciliation controllers
0.28.0containerMay 19, 2026
butler-server
HTTP/WS API server
0.15.1containerMay 20, 2026
butler-console
Web console
0.15.1containerMay 20, 2026
butler-cli
CLI tools (butlerctl, butleradm)
0.9.5binaryMay 20, 2026
butler-bootstrap
Management cluster bootstrap controller
0.5.5containerMay 20, 2026
butler-provider-harvester
Harvester HCI provider controller
0.2.3containerApr 26, 2026
butler-provider-nutanix
Nutanix AHV provider controller
0.2.3containerApr 26, 2026
butler-provider-aws
AWS provider controller
0.1.2containerApr 26, 2026
butler-provider-gcp
GCP provider controller
--container--
butler-provider-azure
Azure provider controller
--container--
butler-image-factory
OS image building and hosting service
--container--
butler-portal
Backstage-based developer portal
0.1.2containerFeb 19, 2026
butler-charts
Helm charts for deployment
0.13.3helmMay 20, 2026

Kubernetes Compatibility​

Butler VersionKubernetes Versions
v0.9.x1.28, 1.29, 1.30, 1.31
v0.8.x1.28, 1.29, 1.30, 1.31
v0.7.x1.28, 1.29, 1.30

Release History​

butler-cli0.9.5May 20, 2026

Changelog

  • chore(bootstrap): bump butler-bootstrap controller image to 0.5.5 (#44)
butler-bootstrap0.5.5May 20, 2026
  • fix(addons): pin butler-console chart to 0.13.3 by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/38
butler-charts0.13.3butler-consoleMay 20, 2026
butler-server0.15.1May 20, 2026
  • fix(gitops): list handlers return empty array not null by @atbagan in https://github.com/butlerdotdev/butler-server/pull/75
butler-console0.15.1May 20, 2026
  • fix(gitops): defensive null guards on list-state setters by @atbagan in https://github.com/butlerdotdev/butler-console/pull/77
butler-cli0.9.4May 20, 2026

Changelog

  • chore(bootstrap): bump butler-bootstrap controller image to 0.5.4 (#43)
butler-bootstrap0.5.4May 20, 2026
  • fix(addons): pin butler-console chart to 0.13.2 by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/37
butler-charts0.13.2butler-consoleMay 20, 2026
butler-cli0.9.3May 20, 2026

Changelog

  • chore(bootstrap): bump butler-bootstrap controller image to 0.5.3 (#42)
butler-bootstrap0.5.3May 20, 2026
  • fix(addons): bump CAPX nutanix provider to v1.8.4 by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/36
butler-cli0.9.2May 19, 2026

Changelog

  • chore(bootstrap): bump butler-bootstrap controller image to 0.5.2 (#41)
butler-bootstrap0.5.2May 19, 2026
  • fix(crds): refresh embedded CRDs from butler-api v0.17.0 by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/35
butler-charts0.28.1butler-controllerMay 19, 2026
butler-charts0.28.0butler-controllerMay 19, 2026
butler-console0.15.0May 19, 2026
  • feat(create-cluster): render ClusterCreationPolicy curation in modal by @atbagan in https://github.com/butlerdotdev/butler-console/pull/76
butler-server0.15.0May 19, 2026
  • feat(server): apply ClusterCreationPolicy to provider option-list handlers by @atbagan in https://github.com/butlerdotdev/butler-server/pull/74
butler-controller0.28.0May 19, 2026
  • docs(adr): ADR-018 ClusterCreationPolicy by @atbagan in https://github.com/butlerdotdev/butler-controller/pull/104
  • docs(adr): promote UI authoring to v1 in ADR-018 by @atbagan in https://github.com/butlerdotdev/butler-controller/pull/106
  • docs(adr): pin mode is exactly one value by @atbagan in https://github.com/butlerdotdev/butler-controller/pull/107
  • docs(adr): rename ClusterWide scope to PlatformWide in ADR-018 by @atbagan in https://github.com/butlerdotdev/butler-controller/pull/108
  • feat(controller): add ClusterCreationPolicy webhook + TenantCluster enforcement by @atbagan in https://github.com/butlerdotdev/butler-controller/pull/105
butler-charts0.21.0butler-crdsMay 19, 2026
butler-cli0.9.1May 17, 2026

Changelog

  • chore(bootstrap): bump butler-bootstrap controller image to 0.5.1 and revert Talos default (#40)
butler-bootstrap0.5.1May 17, 2026
  • chore(bootstrap): revert infrastructure component bumps from audit by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/34
butler-cli0.9.0May 17, 2026

Changelog

  • chore(bootstrap): correct controller image pins to match published tags (#39)
  • chore(bootstrap): pin controller images to explicit semver (#38)
butler-bootstrap0.5.0May 17, 2026
  • chore: bump butler-api to v0.12.0 by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/30
  • Bump butler-api to v0.13.0 by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/31
  • chore(deps): bump butler-api to v0.15.0 by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/32
  • chore(deps): bump bootstrap component versions to current latest by @atbagan in https://github.com/butlerdotdev/butler-bootstrap/pull/33
butler-charts0.13.1butler-consoleMay 13, 2026
butler-console0.14.1May 13, 2026
  • fix(teams): admin team detail blank page when resourceUsage is sparse by @atbagan in https://github.com/butlerdotdev/butler-console/pull/75
butler-charts0.8.4butler-addonsMay 13, 2026
butler-console0.14.0May 12, 2026
  • feat(teams): unified members table and group observed counts by @atbagan in https://github.com/butlerdotdev/butler-console/pull/74
butler-server0.14.1May 12, 2026
  • fix(teams): use User CRD lastSeenGroups for group-based member visibility by @atbagan in https://github.com/butlerdotdev/butler-server/pull/73
butler-server0.14.0May 11, 2026
  • feat(users): write lastSeenGroups at SSO login and read status.teams by @atbagan in https://github.com/butlerdotdev/butler-server/pull/72
butler-charts0.27.0butler-controllerMay 11, 2026
butler-controller0.26.0May 11, 2026
  • feat(controller): add User reconciler for Team membership resolution by @atbagan in https://github.com/butlerdotdev/butler-controller/pull/102

v0.9.x Highlights​

The v0.9.x release cycle introduced cloud provider support and multi-OS workers:

  • butler-api v0.9.0/v0.9.1: LoadBalancerRequest CRD, cloud-aware bootstrap types, multi-OS worker fields, Azure vmSize/imageURN additions
  • butler-controller v0.9.0: Multi-OS kubeadm bootstrap for non-Talos workers (Rocky, Flatcar, Bottlerocket, Kairos)
  • butler-cli v0.5.0: Cloud bootstrap CLI with credential override flags for GCP, AWS, Azure
  • butler-bootstrap v0.3.0: Cloud bootstrap support, LoadBalancerRequest HA
  • butler-console v0.4.1: Images page and ImageSync management UI
  • butler-server v0.4.1: API dependency bump
  • butler-crds v0.8.0: 17 CRDs including LoadBalancerRequest
  • butler-provider-harvester v0.2.0: butler-api v0.9.0 dependency bump
  • butler-provider-nutanix v0.2.0: butler-api v0.9.0 dependency bump

Cloud Provider Initial Releases​

  • butler-provider-aws v0.1.0: AWS EC2 VM provisioning via MachineRequest
  • butler-provider-gcp v0.1.0: GCP Compute Engine VM provisioning via MachineRequest
  • butler-provider-azure v0.1.0: Azure VM provisioning via MachineRequest

Upgrade Guide​

From v0.8.x to v0.9.x​

  1. Update CRDs first -- helm upgrade butler-crds oci://ghcr.io/butlerdotdev/charts/butler-crds --version 0.8.0 -n butler-system
  2. Upgrade controller -- helm upgrade butler-controller oci://ghcr.io/butlerdotdev/charts/butler-controller --version 0.9.0 -n butler-system
  3. Upgrade console -- helm upgrade butler-console oci://ghcr.io/butlerdotdev/charts/butler-console --version 0.5.0 -n butler-system
  4. Verify -- Check controller logs and TenantCluster status