Changelog

Known issues

• Importing Cluster Autoscaler 1.24.0 code via go mod may lead to compilation errors (https://github.com/kubernetes/autoscaler/issues/4875). This is only relevant to other projects importing CA code and has no impact on anyone using official CA image.

General

• CA would no longer block scale-down in entire cluster while some pods are waiting for booting up nodes. This allows scale-down in some NodeGroups to happen, while other NodeGroups are scaling-up (https://github.com/kubernetes/autoscaler/pull/4661).
• Introduced gRPC expander (https://github.com/kubernetes/autoscaler/pull/4452).
• Introduced debugging snapshot feature (https://github.com/kubernetes/autoscaler/pull/4552).
• CA can now continue working even if it is unable to remove some of the VMs that failed to register in the cluster (https://github.com/kubernetes/autoscaler/pull/4810).
• Added --node-info-cache-expire-time flag that controls how long node templates are cached (https://github.com/kubernetes/autoscaler/pull/4669).
• Introduced a --max-pod-eviction-time flag to allow configuration of MaxPodEvictionTime, i.e., the maximum time the cluster autoscaler tries to evict a pod (https://github.com/kubernetes/autoscaler/pull/4842).
• Fixed an issue where large number of pods managed by a single controller with slightly different pod spec (ex. pods created by Jobs using completionMode: Indexed) could lead to extremely slow CA reaction (https://github.com/kubernetes/autoscaler/issues/4724).
• Fixed multiple bugs related to CA not properly accounting for daemonsets in scale-up calculations (https://github.com/kubernetes/autoscaler/pull/4641, https://github.com/kubernetes/autoscaler/pull/4761).
• Status ConfigMap now contains additional information about nodes with unready resources.

AWS

• Abort early if ASG has no capacity. This allows CA retry a different ASG without waiting for 15 minute timeout (https://github.com/kubernetes/autoscaler/pull/4489).
• Added support for colon (:) in the AWS ASG discovery tag keys (https://github.com/kubernetes/autoscaler/pull/4636)
• Updated list of supported instance types (https://github.com/kubernetes/autoscaler/pull/4683).

Azure

• Added support for NP-series VMs (https://github.com/kubernetes/autoscaler/pull/4648).
• Updated list of instance types (https://github.com/kubernetes/autoscaler/pull/4818).

CherryServers

• Added CherryServers provider (https://github.com/kubernetes/autoscaler/pull/4843).

Cluster API

• Fixed a bug where CA would only delete one node, when it intended to remove multiple ones (https://github.com/kubernetes/autoscaler/pull/4634).

Equinix Metal

• Renamed provider from Packet (https://github.com/kubernetes/autoscaler/pull/4580).

Exoscale

• Refactored the cloud provider to support both plain Instance Pools and SKS Nodepools scaling (https://github.com/kubernetes/autoscaler/pull/4247).

External gRPC

• Added External gRPC provider (https://github.com/kubernetes/autoscaler/pull/4654).

GCE

• Increased parallelism of fetching MIG instance templates, which should improve CA performance in clusters with very large number of MIGs (https://github.com/kubernetes/autoscaler/pull/4621).
• Reduced the number of GCE API calls during large scale-downs (https://github.com/kubernetes/autoscaler/pull/4660).

OracleCloud

• Added OracleCloud provider (https://github.com/kubernetes/autoscaler/pull/4349, https://github.com/kubernetes/autoscaler/pull/4769).

TencentCloud

• Added TencentCloud provider (https://github.com/kubernetes/autoscaler/pull/4639).

Vultr

• Added Vultr provider (https://github.com/kubernetes/autoscaler/pull/4653).

Images

• k8s.gcr.io/autoscaling/cluster-autoscaler:v1.24.0
• k8s.gcr.io/autoscaling/cluster-autoscaler-arm64:v1.24.0
• k8s.gcr.io/autoscaling/cluster-autoscaler-amd64:v1.24.0