SIG Cloud Provider annual report for 2021

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+# Contributing
+
+Welcome to the Kubernetes SIG Cloud Provider contributing guide.  We are excited
+about the prospect of you joining our community!
+
+## Before You Begin
+
+We strongly recommend you to understand the main [Kubernetes Contributor
+Guide](http://git.k8s.io/community/contributors/guide) and adhere to the
+contribution rules (specially signing the CLA).
+
+You can also check the [Contributor Cheat
+Sheet](/contributors/guide/contributor-cheatsheet/), with common resources for
+existing developers.
+
+Read the [developer guide].
+
+Please be aware that all contributions to Kubernetes require time and
+commitment from project maintainers to direct and review work. This is done in
+additional to many other maintainer responsibilities, and direct engagement
+from maintainers is a finite resource.
+
+### Learn about our work
+
+* [The Future of Cloud Providers in Kubernetes](https://kubernetes.io/blog/2019/04/17/the-future-of-cloud-providers-in-kubernetes/)
+* [Cloud Controller Manager](https://kubernetes.io/docs/concepts/architecture/cloud-controller/)
+
+## Your first contribution
+
+### Adopt an issue
+
+Pick up an [issue] from the backlog by commenting on the issue that you would
+like to work on it.  Be sure to mention the author of the issue as well as the
+SIG Cloud Provider members.
+
+**Note:** Don't do this unless you will start work on the issue within a few
+days of being assigned.
+
+**Note:** GitHub only allows issues to be assigned to GitHub accounts that are
+part of the organization.
+
+**Picking your first issue**
+
+For your first issue, we recommend picking an issue labeled with "good first
+issue" from the [issue] backlog.  Work with active members of the SIG to find a
+suitable issue if you need help.
+
+**Picking the right size of issue**
+
+Be sure to pick up an issue that is appropriate to the time you are able to
+commit.  We recommend first time contributors start with small or medium
+issues.
+
+Following are very rough estimates, but are best effort only.  They assume you
+have a development environment already set up and are able to build a kubectl
+binary and use it against a cluster.  These estimates assume some knowledge of
+Go.
+
+- `size/S`
+  - simple complexity, good for novices to project (4-10 hours)
+- `size/M`
+  - moderate complexity (10-20 hours)
+- `size/L`
+  - high complexity (20+ hours)
+- `size/XL`
+  - very high complexity, might require help from community members (40-80 hours)
+
+Meta/Umbrella issues may have multiple components.  By signing up for a Meta/Umbrella issue,
+you are only committing to one piece of it.  Let the issue author know when you have completed
+some piece of it, and if you would like to continue working on it, or have it unassigned.
+
+**Picking the right kind of issue**
+
+Guided issues have a *type* defining the type of work to be done.  Pick up an
+issue that fits your experience level and interest.  Documentation and
+test-coverage issues typically are smaller in scope and easier to complete than
+features and cleanup issues.
+
+- `type/code-cleanup`
+  - Usually some refactoring or small rewrites of code.
+- `type/code-documentation`
+  - Write `doc.go` with package overview and examples or add code comments to document
+    existing types and functions.
+- `type/code-feature`
+  - Usually a new go package / library for some functionality that is requested.
+    Should be encapsulated in its own interfaces with thorough unit tests for the new library.
+- `type/code-test-coverage`
+  - Audit tests for a package.  Run coverage tools and also manually look at what functions
+    are missing unit or integration tests.  Write tests for these functions.
+
+**Provide periodic status updates**
+
+Once you have requested an issue and it has been accepted, you will be expected
+to provide periodic updates to it.  Do update the issue with your status at least every
+week, and publish your work to a fork so the community can see your progress and
+provide early feedback.
+
+If you find the issue is too challenging, time consuming, or you are no longer able to work on it,
+this is perfectly acceptable and please let the issue author know.
+If you like, you may pick up a different issue immediately or sometime in the future.
+
+**Testing**
+
+Look at [tests] for more information about testing.
+
+**Summary**:
+
+- Don't pick up an issue until you are ready to start working on it
+- When you want to pick up an issue, be sure to comment to the [leads] that you
+  are taking the issue.
+- Update the issue every week with your progress so we know it is being
+  actively worked on.
+- There is an expectation that some time will be committed to working on the
+  issue each week until it is completed, or you are blocked on a maintainer.
+
+### Meet the community
+
+Engage with the SIG cloud provider community!  Let us know who you are and how
+things are going!
+
+- In [slack][slack-messages] (signup [here][slack-signup]), @mention a
+  [lead][leads] and ask if there are any issues you could pick up, or let them
+  know what you are working on.
+
+- Attend a sig-cloud-provider [meeting] and introduce yourself and what you are
+  working on.
+
+- The sig-cloud-provider [community page] lists sig-cloud-provider [leads],
+  channels of [communication], and group [meeting] times.
+
+## Information about how Features are developed
+
+Kubernetes uses a process called a KEP (Kubernetes enhancement proposal) to
+drive feature development.  See [enhancements] for the most up to date
+information about how enhancements are planned and developed in the Kubernetes
+community.
+
+## Escalation
+
+### If your bug issue is stuck
+
+If an issue isn't getting any attention and is unresolved, mention
+`@kubernetes/sig-cloud-provider-bugs`.
+
+Highlight the severity and urgency of the issue.  For severe issues
+escalate by contacting sig [leads] and attending the [meeting].
+
+### If your feature request issue is stuck
+
+If an issue isn't getting any attention and is unresolved, mention
+`@kubernetes/sig-cloud-provider-feature-requests`.
+
+If a particular issue has a high impact for you or your business,
+make sure this is clear on the bug, and reach out to the sig leads
+directly.  Consider attending the sig meeting to discuss over video
+conference.
+
+### If your PR is stuck
+
+It may happen that your PR seems to be stuck without clear actionable
+feedback for a week or longer.  A PR _associated with a bug or design
+proposal_ is much less likely to be stuck than a dangling PR.
+
+However, if it happens do the following:
+
+- If your PR is stuck for a week or more because it has never gotten any
+  comments, mention `@kubernetes/sig-cloud-provider-pr-reviews` and ask for attention.
+- If your PR is stuck for a week or more _after_ it got comments, but
+  the attention has died down.  Mention the reviewer and comment with
+  [`PTAL`].
+
+If you are still not able to get any attention after a couple days,
+escalate to sig [leads] by mentioning them.
+
+### If your KEP is stuck
+
+It may happen that your KEP gets stuck without getting merged or additional
+feedback. If you believe that your design is important and has been dropped, or
+it is not moving forward, please add it to the sig-cloud-provider bi-weekly
+meeting [agenda] and mail the [group] saying you'd like to discuss it.
+
+### General escalation instructions
+
+See the sig-cloud-provider [community page] for points of contact and meeting times:
+
+- Attend the sig-cloud-provider [meeting]
+- Message one of the sig leads on [slack][slack-messages] (signup [here][slack-signup])
+- Send an email to the _kubernetes-cloud-provider@googlegroups.com_ [group].
+
+## Use of [@mentions]
+
+- `@{any lead}` solicit opinion or advice from [leads].
+- `@kubernetes/sig-cloud-provider-bugs` sig-cloud-provider centric bugs.
+- `@kubernetes/sig-cloud-provider-pr-reviews` triggers review of code fix PR.
+- `@kubernetes/sig-cloud-provider-feature-requests` flags a feature request.
+- `@kubernetes/sig-cloud-provider-proposals` flags a design proposal.
+
+[@mentions]: https://help.github.com/articles/basic-writing-and-formatting-syntax/#mentioning-users-and-teams
+[Kubernetes Basics Tutorial]: https://kubernetes.io/docs/tutorials/kubernetes-basics
+[PR]: https://help.github.com/articles/creating-a-pull-request
+[`PTAL`]: https://en.wiktionary.org/wiki/PTAL
+[agenda]: https://docs.google.com/document/d/1OZE-ub-v6B8y-GuaWejL-vU_f9jsjBbrim4LtTfxssw/edit#
+[communication]:  /sig-cloud-provider/README.md#contact
+[community page]: /sig-cloud-provider
+[developer guide]: /contributors/devel/development.md
+[enhancements]: https://github.com/kubernetes/enhancements
+[group]: https://groups.google.com/forum/#!forum/kubernetes-sig-cloud-provider
+[issue]: https://github.com/kubernetes/cloud-provider/issues
+[leads]: /sig-cloud-provider/README.md#leadership
+[meeting]: /sig-cloud-provider/README.md#meetings
+[slack-messages]: https://kubernetes.slack.com/messages/sig-cloud-provider
+[slack-signup]: http://slack.k8s.io/
+[tests]: /contributors/devel/sig-testing/testing.md