- 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

* Get public IP for Azure vmss nodes. ([#68498](https://github.com/kubernetes/kubernetes/pull/68498), [@feiskyer](https://github.com/feiskyer))
* adjusted http/2 buffer sizes for apiservers to prevent starvation issues between concurrent streams ([#67902](https://github.com/kubernetes/kubernetes/pull/67902), [@liggitt](https://github.com/liggitt))

- DisableAvailabilitySetNodes is added to avoid VM list for VMSS clusters. It should only be used when vmType is "vmss" and all the nodes (including control plane nodes) are VMSS virtual machines. ([#87685](https://github.com/kubernetes/kubernetes/pull/87685), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

- Fix invalid VMSS updates due to incorrect cache ([#89002](https://github.com/kubernetes/kubernetes/pull/89002), [@ArchangelSDY](https://github.com/ArchangelSDY)) [SIG Cloud Provider]

- Azure virtual machine scale sets (VMSS) allow you to create and manage identical load balanced VMs that automatically increase or decrease based on demand or a set schedule.

* fix race condition when attach azure disk in vmss ([#71992](https://github.com/kubernetes/kubernetes/pull/71992), [@andyzhangx](https://github.com/andyzhangx))

## Changelog since v1.13.11

### Other notable changes

* Fix aggressive VM calls for Azure VMSS ([#83102](https://github.com/kubernetes/kubernetes/pull/83102), [@feiskyer](https://github.com/feiskyer))

  ### 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 invalidation
  - 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

- Fix invalid VMSS updates due to incorrect cache ([#89002](https://github.com/kubernetes/kubernetes/pull/89002), [@ArchangelSDY](https://github.com/ArchangelSDY)) [SIG Cloud Provider]
- Fix panic in kubelet when running IPv4/IPv6 dual-stack mode with a CNI plugin ([#82508](https://github.com/kubernetes/kubernetes/pull/82508), [@aanm](https://github.com/aanm)) [SIG Network and Node]

- Fix: ignore not a VMSS error for VMAS nodes in EnsureBackendPoolDeleted. (#105185, @ialidzhikov) [SIG Cloud Provider]
- Fix: leave the probe path empty for TCP probes (#105253, @nilo19) [SIG Cloud Provider]
- Fix: remove VMSS and VMSS instances from SLB backend pool only when necessary (#105839, @nilo19) [SIG Cloud Provider]
- Fix: skip instance not found when decoupling vmss from lb (#105666, @nilo19) [SIG Cloud Provider]