* 📝 Add docs about Environment Variables and Virtual Environments. PR [#12054](https://github.com/fastapi/fastapi/pull/12054) by [@tiangolo](https://github.com/tiangolo).
* 📝 Add Asyncer mention in async docs. PR [#12037](https://github.com/fastapi/fastapi/pull/12037) by [@tiangolo](https://github.com/tiangolo).

* Fixed [#61123](https://github.com/kubernetes/kubernetes/pull/61123) by triggering syncer.Update on all cases including when a syncer is created ([#61124](https://github.com/kubernetes/kubernetes/pull/61124), [@satyasm](https://github.com/satyasm))

## Changelog since v1.18.15

## Changes by Kind

### Bug or Regression

- Avoid marking node as Ready until node has synced with API servers at least once ([#99034](https://github.com/kubernetes/kubernetes/pull/99034), [@ehashman](https://github.com/ehashman)) [SIG Node]

- The EndpointSlice controller now waits for EndpointSlice and Node caches to be synced before starting. ([#94086](https://github.com/kubernetes/kubernetes/pull/94086), [@robscott](https://github.com/robscott)) [SIG Apps and Network]

* Fixed [#61123](https://github.com/kubernetes/kubernetes/pull/61123) by triggering syncer.Update on all cases including when a syncer is created ([#61124](https://github.com/kubernetes/kubernetes/pull/61124), [@satyasm](https://github.com/satyasm))
    * on a new add event.

- Shared informers now correctly propagate whether they are synced or not. Individual informer handlers may now check if they are synced or not (new `HasSynced` method). Library support is added to assist controllers in tracking whether their own work is completed for items in the initial list (`AsyncTracker`). ([#113985](https://github.com/kuber...

#### Scheduling

* The fix makes scheduling go routine waiting for cache (e.g. Pod) to be synced. ([#45453](https://github.com/kubernetes/kubernetes/pull/45453), [@k82cn](https://github.com/k82cn))

### Bug or Regression

- Aggregate errors when putting vmss ([#98350](https://github.com/kubernetes/kubernetes/pull/98350), [@nilo19](https://github.com/nilo19)) [SIG Cloud Provider]
- Avoid marking node as Ready until node has synced with API servers at least once ([#97995](https://github.com/kubernetes/kubernetes/pull/97995), [@ehashman](https://github.com/ehashman)) [SIG Node]

    * [prometheus-to-sd addon] Bump prometheus-to-sd to 0.3.1 to pick up security fixes, bug fixes and new features.
    * [event-exporter addon] Bump event-exporter to 0.2.3 to pick up security fixes.

- A PersistentVolumeClaim may not have been synced to the controller local cache in time if the PersistentVolumeis bound by an external PV binder (such as kube-scheduler), so Kubernetes will now double check if PVC is not found in order to prevent the volume from being incorrectly reclaimed. ([#6...