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<h1 id="external-dns-deprecation-policy">External DNS Deprecation Policy<a class="headerlink" href="#external-dns-deprecation-policy" title="Permanent link">&para;</a></h1>
<p>This document defines the Deprecation Policy for External DNS.</p>
<p>Kubernetes is a dynamic system driven by APIs, which evolve with each new release. A crucial aspect of any API-driven system is having a well-defined deprecation policy.<br />
This policy informs users about APIs that are slated for removal or modification. Kubernetes follows this principle and periodically refines or upgrades its APIs or capabilities.<br />
Consequently, older features are marked as deprecated and eventually phased out. To avoid breaking existing users, we should follow a simple deprecation policy for behaviors that a slated to be removed.</p>
<p>The features and capabilities either to evolve or need to be removed.</p>
<h2 id="deprecation-policy">Deprecation Policy<a class="headerlink" href="#deprecation-policy" title="Permanent link">&para;</a></h2>
<p>We follow the <a href="https://kubernetes.io/docs/reference/using-api/deprecation-policy/">Kubernetes Deprecation Policy</a> and <a href="https://kubernetes.io/docs/reference/using-api/#api-versioning">API Versioning Scheme</a>: alpha, beta, GA.<br />
It is therefore important to be aware of deprecation announcements and know when API versions will be removed, to help minimize the effect.</p>
<h3 id="scope">Scope<a class="headerlink" href="#scope" title="Permanent link">&para;</a></h3>
<ul>
<li>CRDs and API Objects and fields: <code>.Spec</code>, <code>.Status</code> and <code>.Status.Conditions[]</code></li>
<li>Annotations objects or it&rsquo;s values</li>
<li>Controller Configuration: CLI flags &amp; environment variables</li>
<li>Metrics as defined in the <a href="https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecating-a-metric">Kubernetes docs</a></li>
<li>Revert a specific behavior without an alternative (flag,crd or annotation)</li>
</ul>
<h3 id="non-scope">Non-Scope<a class="headerlink" href="#non-scope" title="Permanent link">&para;</a></h3>
<p>Everything not listed in scope is not subject to this deprecation policy and it is subject to breaking changes, updates at any point in time, and deprecation - as long as it follows the Deprecation Process listed below.</p>
<p>This includes, but isn&rsquo;t limited to:</p>
<ul>
<li>Any feature/specific behavior not in Scope.</li>
<li>Source code imports</li>
<li>Source code refactorings</li>
<li>Helm Charts</li>
<li>Release process</li>
<li>Docker Images (including multi-arch builds)</li>
<li>Image Signature (including provenance, providers, keys)</li>
</ul>
<h2 id="including-features-and-behaviors-to-the-deprecation-policy">Including features and behaviors to the Deprecation Policy<a class="headerlink" href="#including-features-and-behaviors-to-the-deprecation-policy" title="Permanent link">&para;</a></h2>
<p>Any <code>maintainer</code> or <code>contributor</code> may propose including a feature, component, or behavior out of scope to be in scope of the deprecation policy.</p>
<p>The proposal must clearly outline the rationale for inclusion, the impact on users, stability, long term maintenance plan, and day-to-day activities, if such.</p>
<p>The proposal must be formalized by submitting a <code>docs/proposal/EDP-XXX.md</code> document in a Pull Request. Pull request must be labeled with <code>kind/proposal</code>.</p>
<p>The proposal template location is <a href="../proposal/design-template/">here</a>. The template is quite complete, one can remove any unnecessary or irrelevant section on a specific proposal.</p>
<h2 id="deprecation-process">Deprecation Process<a class="headerlink" href="#deprecation-process" title="Permanent link">&para;</a></h2>
<h3 id="nomination-of-deprecation">Nomination of Deprecation<a class="headerlink" href="#nomination-of-deprecation" title="Permanent link">&para;</a></h3>
<p>Any maintainer may propose deprecating a feature, component, or behavior (both in and out of scope). In Scope changes must abide to the Deprecation Policy above.</p>
<p>The proposal must clearly outline the rationale for deprecation, the impact on users, and any alternatives, if such.</p>
<p>The proposal must be formalized by submiting a <code>design</code> document as a Pull Request.</p>
<h3 id="showcase-to-maintainers">Showcase to Maintainers<a class="headerlink" href="#showcase-to-maintainers" title="Permanent link">&para;</a></h3>
<p>The proposing maintainer must present the proposed deprecation to the maintainer group. This can be done synchronously during a community meeting or asynchronously, through a GitHub Pull Request.</p>
<h3 id="voting">Voting<a class="headerlink" href="#voting" title="Permanent link">&para;</a></h3>
<p>A majority vote of maintainers is required to approve the deprecation.<br />
Votes may be conducted asynchronously, with a reasonable deadline for responses (e.g., one week). Lazy Consensus applies if the reasonable deadline is extended, with a minimal of at least one other maintainer approving the changes.</p>
<h3 id="implementation">Implementation<a class="headerlink" href="#implementation" title="Permanent link">&para;</a></h3>
<p>Upon approval, the proposing maintainer is responsible for implementing the changes required to mark the feature as deprecated. This includes:</p>
<ul>
<li>Updating the codebase with deprecation warnings where applicable.</li>
<li>log.Warn(&ldquo;The XXX is on the path of <strong><em>DEPRECATION</em></strong>. We recommend that you use YYY (link to docs)&rdquo;)</li>
<li>Documenting the deprecation in release notes and relevant documentation.</li>
<li>Updating APIs, metrics, or behaviors per the Kubernetes Deprecation Policy if in scope.</li>
<li>If the feature is entirely deprecated, archival of any associated repositories (external provider as example).</li>
</ul>
<h3 id="deprecation-notice-in-release">Deprecation Notice in Release<a class="headerlink" href="#deprecation-notice-in-release" title="Permanent link">&para;</a></h3>
<p>Deprecation must be introduced in the next release. The release must follow semantic versioning:</p>
<ul>
<li>If the project is in the 0.x stage, a <code>minor</code> version <code>bump</code> is required.</li>
<li>For projects 1.x and beyond, a major version bump is required. For the features completely removed.</li>
<li>If it&rsquo;s a flag change/flip, the <code>minor</code> version <code>bump</code> is acceptable</li>
</ul>
<h3 id="full-deprecation-and-removal">Full Deprecation and Removal<a class="headerlink" href="#full-deprecation-and-removal" title="Permanent link">&para;</a></h3>
<p>The removal must follow standard Kubernetes deprecation timelines if the feature is in scope.</p>
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