Cluster Autoscaler 1.20.0

Changelog

General

• Fix priority expander falling back to a random choice even though there is a higher priority option to choose
• Clone kubernetes/kubernetes in update-vendor.sh shallowly, instead of fetching all revisions
• Speed up binpacking by reducing the number of PreFilter calls (call once per pod instead of #pods*#nodes times)
• Speed up finding unneeded nodes by 5x+ in very large clusters by reducing the number of PreFilter calls
• Expose --max-nodes-total as a metric
• Errors in IncreaseSize changed fromt type apiError to cloudProviderError
• Make build-in-docker and test-in-docker work on Linux systems with SELinux enabled
• Fix an error where existing nodes were not considered as destinations while finding place for pods in scale-down simulations
• Remove redundant log lines and reduce severity around parsing kubeEnv
• Don't treat nodes created by virtual kuebelet as nodes from non-autoscaled node groups
• Remove redundant logging around calculating node utilization
• Add configurable --network and --rm flags for docker in Makefile
• Substract DaemonSet pods' requests from node allocatable in the denominator while computing node utilization
• Include taints by condition when determining if a node is unready/still starting
• Fix update-vendor.sh to work on OSX and zsh
• Add best-effort eviction for DaemonSet pods while scaling down non-empty nodes
• Add build support for ARM64

AliCloud

• Add missing daemonsets and replicasets to ALI example cluster role

Apache CloudStack

• Add support for Apache CloudStack

AWS

• Regenerate list of EC2 instances
• Fix pricing endpoint in AWS China Region

Azure

• Add optional jitter on initial VMSS VM cache refresh, keep the refreshes spread over time
• Serve from cache for the whole period of ongoing throttling
• Fix unwanted VMSS VMs cache invalidations
• Enforce setting the number of retries if cloud provider backoff is enabled
• Don't update capacity if VMSS provisioning state is updating
• Support allocatable resources overrides via VMSS tags
• Add missing stable labels in template nodes
• Proactively set instance status to deleting on node deletions

Cluster API

• Migrate interaction with the API from using internal types to using Unstructured
• Improve tests to work better with constrained resources
• Add support for node autodiscovery
• Add support for --cloud-config
• Update group identifier to use for Cluster API annotations

Exoscale

• Add support for Exoscale

GCE

• Decrease the number of GCE Read Requests made while deleting nodes
• Base pricing of custom instances on their instance family type
• Add pricing information for missing machine types
• Add pricing information for different GPU types
• Ignore the new topology.gke.io/zone label when comparing groups
• Add missing stable labels to template nodes

HuaweiCloud

• Add auto scaling group support
• Implement node group by AS
• Implement getting desired instance number of node group
• Implement increasing node group size
• Implement TemplateNodeInfo
• Implement caching instances

IONOS

• Add support for IONOS

Kubemark

• Skip non-kubemark nodes while computing node infos for node groups.

Magnum

• Add Magnum support in the Cluster Autoscaler helm chart

Packet

• Allow empty nodepools
• Add support for multiple nodepools
• Add pricing support

Images

• k8s.gcr.io/autoscaling/cluster-autoscaler:v1.20.0
• k8s.gcr.io/autoscaling/cluster-autoscaler-arm64:v1.20.0
• k8s.gcr.io/autoscaling/cluster-autoscaler-amd64:v1.20.0