- Fixed the following 
  -  AWS Cloud Provider attempts to delete LoadBalancer security group it didn’t provision

  - [beta] Opt in source ip preservation for Services with Type NodePort or LoadBalancer ([docs](http://kubernetes.io/docs/tutorials/services/source-ip/)) ([kubernetes/features#27](https://github.com/kubernetes/enhancements/issues/27))

## Changelog since v1.17.16

## Changes by Kind

### Bug or Regression

- Fix counting error in service/nodeport/loadbalancer quota check ([#97830](https://github.com/kubernetes/kubernetes/pull/97830), [@pacoxu](https://github.com/pacoxu)) [SIG API Machinery and Network]

- Setting the `status.loadBalancer` of a Service whose `spec.type` is not `LoadBalancer` was previously allowed, but any update to the `metadata` or `spec` would wipe that field. Setting this field is no longer permitted unless `spec.type` is  `LoadBalancer`.  In the very unlikely event that this has unexpected impact, you can enable the `AllowServiceLBStatusOnNonLB` feature gate, which will...

- If Openstack LoadBalancer is not defined in cloud config, the loadbalancer will no longer beis not initialized. any more in openstack. All setups must have some setting under that section for the OpenStack provider. ([#65781](https://github.com/kubernetes/kubernetes/pull/65781), [@zetaab](http...

- Kube-proxy: delete stale conntrack UDP entries for loadbalancer ingress IP. ([#104151](https://github.com/kubernetes/kubernetes/pull/104151), [@aojea](https://github.com/aojea)) [SIG Network]

- Fix counting error in service/nodeport/loadbalancer quota check ([#97828](https://github.com/kubernetes/kubernetes/pull/97828), [@pacoxu](https://github.com/pacoxu)) [SIG API Machinery and Network]

* Fix panic in ControllerManager on GCE when it has a problem with creating external loadbalancer healthcheck ([#52646](https://github.com/kubernetes/kubernetes/pull/52646), [@gmarek](https://github.com/gmarek))

* Services of type=LoadBalancer which have no endpoints will now immediately ICMP reject connections, rather than time out. ([#74394](https://github.com/kubernetes/kubernetes/pull/74394), [@thockin](https://github.com/thockin))

  * **alpha**: NVIDIA GPU support ([#24836](https://github.com/kubernetes/kubernetes/pull/24836), [@therc](https://github.com/therc))
  * Adding loadBalancer services and nodeports services to quota system

## Known Issues and Important Steps before Upgrading