Merge pull request #2085 from fluxcd/rfc-template

[RFC-0000] Introduce the Flux RFC template

rfcs/README.md

+# Flux RFCs
+
+In many cases, new features and enhancements are proposed on [flux2/discussions](https://github.com/fluxcd/flux2/discussions).
+A proposal is discussed in public by maintainers, contributors, users and other interested parties.
+After some form of consensus is reached between participants, the proposed changes go through the
+pull request process where the implementation details are reviewed, approved or rejected by maintainers.
+
+Some proposals may be **substantial**, and for these we ask for a design process to be followed
+so that all stakeholders can be confident about the direction Flux is evolving in.
+
+The "RFC" (request for comments) process is intended to provide a consistent and
+controlled path for substantial changes to enter Flux.
+
+Examples of substantial changes:
+
+- API additions (new kinds of resources, new relationships between existing APIs)
+- API breaking changes (new required fields, field removals)
+- Security related changes (Flux controllers permissions, tenant isolation and impersonation)
+- Impactful UX changes (new required inputs to the bootstrap process)
+- Drop capabilities (sunset an existing integration with an external service due to security concerns)
+
+## RFC Process
+
+- Before submitting an RFC please discuss the proposal with the Flux community.
+  Start a discussion on GitHub and ask for feedback at the weekly dev meeting.
+  You must find a maintainer willing to sponsor the RFC.
+- Submit an RFC by opening a pull request using [RFC-0000](RFC-0000/README.md) as template.
+- The sponsor will assign the PR to themselves, will label the PR with `area/RFC` and
+  will request other maintainers to begin the review process.
+- Integrate feedback by adding commits without overriding the history.
+- At least two maintainers have to approve the proposal before it can be merged.
+  Approvers must be satisfied that an
+  [appropriate level of consensus](https://github.com/fluxcd/community/blob/main/GOVERNANCE.md#decision-guidelines)
+  has been reached.
+- Before the merge, an RFC number is assigned by the sponsor and the PR branch must be rebased with main.
+- Once merged, the proposal may be implemented in Flux.
+  The progress could be tracked using the RFC number (used as prefix for issues and PRs).
+- After the proposal implementation is available in a release candidate or final release,
+  the RFC should be updated with the Flux version added to the "Implementation History" section.
+- During the implementation phase, the RFC could be discarded due to security or performance concerns.
+  In this case, the RFC "Implementation History" should state the rejection motives.
+  Ultimately the decision on the feasibility of a particular implementation,
+  resides with the maintainers that reviewed the code changes.
+- A new RFC could be summited with the scope of replacing an RFC rejected during implementation.
+  The new RFC must come with a solution for the rejection motives of the previous RFC.

rfcs/RFC-0000/README.md

+# RFC-NNNN Title
+
+<!--
+The title must be short and descriptive.
+-->
+
+**Status:** provisional
+
+<!--
+Status represents the current state of the RFC.
+Must be one of `provisional`, `implementable`, `implemented`, `deferred`, `rejected`, `withdrawn`, or `replaced`.
+-->
+
+**Creation date:** YYYY-MM-DD
+
+**Last update:** YYYY-MM-DD
+
+## Summary
+
+<!--
+One paragraph explanation of the proposed feature or enhancement.
+-->
+
+## Motivation
+
+<!--
+This section is for explicitly listing the motivation, goals, and non-goals of
+this RFC. Describe why the change is important and the benefits to users.
+-->
+
+### Goals
+
+<!--
+List the specific goals of this RFC. What is it trying to achieve? How will we
+know that this has succeeded?
+-->
+
+### Non-Goals
+
+<!--
+What is out of scope for this RFC? Listing non-goals helps to focus discussion
+and make progress.
+-->
+
+## Proposal
+
+<!--
+This is where we get down to the specifics of what the proposal actually is.
+This should have enough detail that reviewers can understand exactly what
+you're proposing, but should not include things like API designs or
+implementation.
+
+If the RFC goal is to document best practices,
+then this section can be replaced with the the actual documentation.
+-->
+
+### User Stories
+
+<!--
+Optional if existing discussions and/or issues are linked in the motivation section.
+-->
+
+### Alternatives
+
+<!--
+List plausible alternatives to the proposal and explain why the proposal is superior.
+
+This is a good place to incorporate suggestions made during discussion of the RFC.
+-->
+
+## Design Details
+
+<!--
+This section should contain enough information that the specifics of your
+change are understandable. This may include API specs and code snippets.
+
+The design details should address at least the following questions:
+- How can this feature be enabled / disabled?
+- Does enabling the feature change any default behavior?
+- Can the feature be disabled once it has been enabled?
+- How can an operator determine if the feature is in use?
+- Are there any drawbacks when enabling this feature?
+-->
+
+## Implementation History
+
+<!--
+Major milestones in the lifecycle of the RFC such as:
+- The first Flux release where an initial version of the RFC was available.
+- The version of Flux where the RFC graduated to general availability.
+- The version of Flux where the RFC was retired or superseded.
+-->