Move gha-* docs out of preview (actions#2779)

Author: Link-

README.md

@@ -4,39 +4,40 @@
 [![awesome-runners](https://img.shields.io/badge/listed%20on-awesome--runners-blue.svg)](https://github.com/jonico/awesome-runners)
 [![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/actions-runner-controller)](https://artifacthub.io/packages/search?repo=actions-runner-controller)
 
+## About
+
+Actions Runner Controller (ARC) is a Kubernetes operator that orchestrates and scales self-hosted runners for GitHub Actions.
+
+With ARC, you can create runner scale sets that automatically scale based on the number of workflows running in your repository, organization, or enterprise. Because controlled runners can be ephemeral and based on containers, new runner instances can scale up or down rapidly and cleanly. For more information about autoscaling, see ["Autoscaling with self-hosted runners."](https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners/autoscaling-with-self-hosted-runners)
+
+You can set up ARC on Kubernetes using Helm, then create and run a workflow that uses runner scale sets. For more information about runner scale sets, see ["Deploying runner scale sets with Actions Runner Controller."](https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/deploying-runner-scale-sets-with-actions-runner-controller#runner-scale-set)
 ## People
 
-`actions-runner-controller` is an open-source project currently developed and maintained in collaboration with the GitHub Actions team, external maintainers @mumoshu and @toast-gear, various [contributors](https://github.com/actions/actions-runner-controller/graphs/contributors), and the [awesome community](https://github.com/actions/actions-runner-controller/discussions).
+Actions Runner Controller (ARC) is an open-source project currently developed and maintained in collaboration with the GitHub Actions team, external maintainers @mumoshu and @toast-gear, various [contributors](https://github.com/actions/actions-runner-controller/graphs/contributors), and the [awesome community](https://github.com/actions/actions-runner-controller/discussions).
 
 If you think the project is awesome and is adding value to your business, please consider directly sponsoring [community maintainers](https://github.com/sponsors/actions-runner-controller) and individual contributors via GitHub Sponsors.
 
 In case you are already the employer of one of contributors, sponsoring via GitHub Sponsors might not be an option. Just support them in other means!
 
-
 See [the sponsorship dashboard](https://github.com/sponsors/actions-runner-controller) for the former and the current sponsors.
 
-## Status
-
-Even though actions-runner-controller is used in production environments, it is still in its early stage of development, hence versioned 0.x.
+## Getting Started
 
-actions-runner-controller complies to Semantic Versioning 2.0.0 in which v0.x means that there could be backward-incompatible changes for every release.
+To give ARC a try with just a handful of commands, Please refer to the [Quickstart guide](https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/quickstart-for-actions-runner-controller).
 
-The documentation is kept inline with master@HEAD, we do our best to highlight any features that require a specific ARC version or higher however this is not always easily done due to there being many moving parts. Additionally, we actively do not retain compatibly with every GitHub Enterprise Server version nor every Kubernetes version so you will need to ensure you stay current within a reasonable timespan.
+For an overview of ARC, please refer to [About ARC](https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/about-actions-runner-controller)
 
-## About
+With the introduction of [autoscaling runner scale sets](https://github.com/actions/actions-runner-controller/discussions/2775), the existing [autoscaling modes](./docs/automatically-scaling-runners.md) are now legacy. The legacy modes have certain use cases and will continue to be maintained by the community only.
 
-[GitHub Actions](https://github.com/features/actions) is a very useful tool for automating development. GitHub Actions jobs are run in the cloud by default, but you may want to run your jobs in your environment. [Self-hosted runner](https://github.com/actions/runner) can be used for such use cases, but requires the provisioning and configuration of a virtual machine instance. Instead if you already have a Kubernetes cluster, it makes more sense to run the self-hosted runner on top of it.
+For further information on what is supported by GitHub and what's managed by the community, please refer to [this announcement discussion.](https://github.com/actions/actions-runner-controller/discussions/2775)
 
-**actions-runner-controller** makes that possible. Just create a *Runner* resource on your Kubernetes, and it will run and operate the self-hosted runner for the specified repository. Combined with Kubernetes RBAC, you can also build simple Self-hosted runners as a Service.
-
-## Getting Started
-To give ARC a try with just a handful of commands, Please refer to the [Quickstart guide](/docs/quickstart.md). 
+### Documentation
 
-For an overview of ARC, please refer to [About ARC](https://github.com/actions/actions-runner-controller/blob/master/docs/about-arc.md)
+ARC documentation is available on [docs.github.com](https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/quickstart-for-actions-runner-controller).
 
-For more information, please refer to detailed documentation below!
+### Legacy documentation
 
-## Documentation
+The following documentation is for the legacy autoscaling modes that continue to be maintained by the community
 
 - [Quickstart guide](/docs/quickstart.md)
 - [About ARC](/docs/about-arc.md)

docs/gha-runner-scale-set-controller/README.md

@@ -0,0 +1,119 @@
+# Autoscaling Runner Scale Sets mode
+
+This new autoscaling mode brings numerous enhancements (described in the following sections) that will make your experience more reliable and secure.
+
+## How it works
+
+![ARC architecture diagram](arc-diagram-light.png#gh-light-mode-only)
+![ARC architecture diagram](arc-diagram-dark.png#gh-dark-mode-only)
+
+1. ARC is installed using the supplied Helm charts, and the controller manager pod is deployed in the specified namespace. A new `AutoScalingRunnerSet` resource is deployed via the supplied Helm charts or a customized manifest file. The `AutoScalingRunnerSet` controller calls GitHub's APIs to fetch the runner group ID that the runner scale set will belong to.
+2. The `AutoScalingRunnerSet` controller calls the APIs one more time to either fetch or create a runner scale set in the `Actions Service` before creating the `Runner ScaleSet Listener` resource.
+3. A `Runner ScaleSet Listener` pod is deployed by the `AutoScaling Listener Controller`. In this pod, the listener application connects to the `Actions Service` to authenticate and establish a long poll HTTPS connection. The listener stays idle until it receives a `Job Available` message from the `Actions Service`.
+4. When a workflow run is triggered from a repository, the `Actions Service` dispatches individual job runs to the runners or runner scalesets where the `runs-on` property matches the name of the runner scaleset or labels of self-hosted runners.
+5. When the `Runner ScaleSet Listener` receives the `Job Available` message, it checks whether it can scale up to the desired count. If it can, the `Runner ScaleSet Listener` acknowledges the message.
+6. The `Runner ScaleSet Listener` uses a `Service Account` and a `Role` bound to that account to make an HTTPS call through the Kubernetes APIs to patch the `EphemeralRunner Set` resource with the number of desired replicas count.
+7. The `EphemeralRunner Set` attempts to create new runners and the `EphemeralRunner Controller` requests a JIT configuration token to register these runners. The controller attempts to create runner pods. If the pod's status is `failed`, the controller retries up to 5 times. After 24 hours the `Actions Service` unassigns the job if no runner accepts it.
+8. Once the runner pod is created, the runner application in the pod uses the JIT configuration token to register itself with the `Actions Service`. It then establishes another HTTPS long poll connection to receive the job details it needs to execute.
+9. The `Actions Service` acknowledges the runner registration and dispatches the job run details.
+10. Throughout the job run execution, the runner continuously communicates the logs and job run status back to the `Actions Service`.
+11. When the runner completes its job successfully, the `EphemeralRunner Controller` checks with the `Actions Service` to see if runner can be deleted. If it can, the `Ephemeral RunnerSet` deletes the runner.
+
+In addition to the increased reliability of the automatic scaling, we have worked on these improvements:
+
+- No longer require cert-manager as a prerequisite for installing actions-runner-controller
+- Reliable scale-up based on job demands and scale-down to zero runner pods
+- Reduce API requests to `api.github.com`, no more API rate-limiting problems
+- The GitHub Personal Access Token (PAT) or the GitHub App installation token is no longer passed to the runner pod for runner registration
+- Maximum flexibility for customizing your runner pod template
+
+### Demo
+
+[![Watch the walkthrough](thumbnail.png)](https://youtu.be/wQ0k5k6KW5Y)
+
+> Will take you to Youtube for a short walkthrough of the Autoscaling Runner Scale Sets mode.
+
+## Setup
+
+You can follow [this quickstart guide](https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/quickstart-for-actions-runner-controller) for installation steps.
+
+## Troubleshooting
+
+You can follow [this troubleshooting guide](https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/troubleshooting-actions-runner-controller-errors) for troubleshooting steps.
+
+## Changelog
+
+### v0.5.0
+
+1. Provide scale-set listener metrics [#2559](https://github.com/actions/actions-runner-controller/pull/2559)
+1. Add DrainJobsMode [#2569](https://github.com/actions/actions-runner-controller/pull/2569)
+1. Trim gha-runner-scale-set to gha-rs in names and remove role type suffixes [#2706](https://github.com/actions/actions-runner-controller/pull/2706)
+1. Adapt role name to prevent namespace collision [#2617](https://github.com/actions/actions-runner-controller/pull/2617)
+1. Add status check before deserializing runner-registration response [#2699](https://github.com/actions/actions-runner-controller/pull/2699)
+1. Add configurable log format to values.yaml and propagate it to listener [#2686](https://github.com/actions/actions-runner-controller/pull/2686)
+1. Extend manager roles to accept ephemeralrunnerset/finalizers [#2493](https://github.com/actions/actions-runner-controller/pull/2493)
+1. Trim repo/org/enterprise to 63 characters in label values [#2657](https://github.com/actions/actions-runner-controller/pull/2657)
+1. Discard logs on helm chart tests [#2607](https://github.com/actions/actions-runner-controller/pull/2607)
+1. Use build.Version to check if resource version is a mismatch [#2521](https://github.com/actions/actions-runner-controller/pull/2521)
+1. Reordering methods and constants so it is easier to look it up [#2501](https://github.com/actions/actions-runner-controller/pull/2501)
+1. chore: Set build version on make-runscaleset [#2713](https://github.com/actions/actions-runner-controller/pull/2713)
+1. Fix scaling back to 0 after min runners were set to number > 0 [#2742](https://github.com/actions/actions-runner-controller/pull/2742)
+1. Document customization for containerModes [#2777](https://github.com/actions/actions-runner-controller/pull/2777)
+1. Bump github.com/cloudflare/circl from 1.1.0 to 1.3.3 [#2628](https://github.com/actions/actions-runner-controller/pull/2628)
+1. chore(deps): bump github.com/stretchr/testify from 1.8.2 to 1.8.4 [#2716](https://github.com/actions/actions-runner-controller/pull/2716)
+1. Move gha-* docs out of preview [#2779](https://github.com/actions/actions-runner-controller/pull/2779)
+1. Prepare 0.5.0 release [#2783](https://github.com/actions/actions-runner-controller/pull/2783)
+
+### v0.4.0
+
+#### ⚠️ Warning
+
+This release contains a major change related to the way permissions are
+applied to the manager ([#2276](https://github.com/actions/actions-runner-controller/pull/2276) and [#2363](https://github.com/actions/actions-runner-controller/pull/2363)).
+
+Please evaluate these changes carefully before upgrading.
+
+#### Major changes
+
+1. Surface EphemeralRunnerSet stats to AutoscalingRunnerSet [#2382](https://github.com/actions/actions-runner-controller/pull/2382)
+1. Improved security posture by removing list/watch secrets permission from manager cluster role
+   [#2276](https://github.com/actions/actions-runner-controller/pull/2276)
+1. Improved security posture by delaying role/rolebinding creation to gha-runner-scale-set during installation
+   [#2363](https://github.com/actions/actions-runner-controller/pull/2363)
+1. Improved security posture by supporting watching a single namespace from the controller
+   [#2374](https://github.com/actions/actions-runner-controller/pull/2374)
+1. Added labels to AutoscalingRunnerSet subresources to allow easier inspection [#2391](https://github.com/actions/actions-runner-controller/pull/2391)
+1. Fixed bug preventing env variables from being specified
+   [#2450](https://github.com/actions/actions-runner-controller/pull/2450)
+1. Enhance quickstart troubleshooting guides
+   [#2435](https://github.com/actions/actions-runner-controller/pull/2435)
+1. Fixed ignore extra dind container when container mode type is "dind"
+   [#2418](https://github.com/actions/actions-runner-controller/pull/2418)
+1. Added additional cleanup finalizers [#2433](https://github.com/actions/actions-runner-controller/pull/2433)
+1. gha-runner-scale-set listener pod inherits the ImagePullPolicy from the manager pod [#2477](https://github.com/actions/actions-runner-controller/pull/2477)
+1. Treat `.ghe.com` domain as hosted environment [#2480](https://github.com/actions/actions-runner-controller/pull/2480)
+
+### v0.3.0
+
+#### Major changes
+
+1. Runner pods are more similar to hosted runners [#2348](https://github.com/actions/actions-runner-controller/pull/2348)
+1. Add support for self-signed CA certificates [#2268](https://github.com/actions/actions-runner-controller/pull/2268)
+1. Fixed trailing slashes in config URLs breaking installations [#2381](https://github.com/actions/actions-runner-controller/pull/2381)
+1. Fixed a bug where the listener pod would ignore proxy settings from env [#2366](https://github.com/actions/actions-runner-controller/pull/2366)
+1. Added runner set name field making it optionally configurable [#2279](https://github.com/actions/actions-runner-controller/pull/2279)
+1. Name and namespace labels of listener pod have been split [#2341](https://github.com/actions/actions-runner-controller/pull/2341)
+1. Added chart name constraints validation on AutoscalingRunnerSet install [#2347](https://github.com/actions/actions-runner-controller/pull/2347)
+
+### v0.2.0
+
+#### Major changes
+
+1. Added proxy support for the controller and the runner pods, see the new helm chart fields [#2286](https://github.com/actions/actions-runner-controller/pull/2286)
+1. Added the abiilty to provide a pre-defined kubernetes secret for the auto scaling runner set helm chart [#2234](https://github.com/actions/actions-runner-controller/pull/2234)
+1. Enhanced security posture by removing un-required permissions for the manager-role [#2260](https://github.com/actions/actions-runner-controller/pull/2260)
+1. Enhanced our logging by returning an error when a runner group is defined in the values file but it's not created in GitHub [#2215](https://github.com/actions/actions-runner-controller/pull/2215)
+1. Fixed helm charts issues that were preventing the use of DinD [#2291](https://github.com/actions/actions-runner-controller/pull/2291)
+1. Fixed a bug that was preventing runner scale from being removed from the backend when they were deleted from the cluster [#2255](https://github.com/actions/actions-runner-controller/pull/2255) [#2223](https://github.com/actions/actions-runner-controller/pull/2223)
+1. Fixed bugs with the helm chart definitions preventing certain values from being set [#2222](https://github.com/actions/actions-runner-controller/pull/2222)
+1. Fixed a bug that prevented the configuration of a runner group for a runner scale set [#2216](https://github.com/actions/actions-runner-controller/pull/2216)