H4HIP: Adding a HIP on charts v3

hips/hip-0000.md

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+---
+hip: 9999
+title: "H4HIP: Charts v3 Enablement"
+authors: [ "Matt Farina <[email protected]>" ]
+created: "2025-01-09"
+type: "feature"
+status: "draft"
+---
+
+## Abstract
+
+This HIP proposes the creation of charts v3, updating Helm to handle charts v2 and v3, and a
+timeline for the general availability of charts v3 that can happen after the release of Helm v4.0.0.
+
+## Motivation
+
+Many of the proposed changes for Helm v4 affect charts. Layering these onto existing charts will
+sometimes cause chart installation and upgrade to happen differently in Helm v3 and Helm v4, as
+both will need to live side by side for a time. It also means that testing of charts for v3 can produce
+a different result when installed with Helm v4.
+
+In addition to the affects of the changes, Helm v4 development has a fixed timeline and making
+changes to Helm in addition to reworking charts is not likely to fit within that fixed window. Enabling
+the development of charts v3 to happen as an experiment that becomes generally available after
+the release of Helm v4 provides more time to continue the work and get feedback.
+
+The goal is to provide adequate time to work on chart changes while doing it in a way that enables
+trust in existing charts to run as they were tested.
+
+## Rationale
+
+Charts v2 were created for Helm v3 and introduced minor changes. The code that handles the chart
+versions is the same with some checking to handle the differences. This handling ended up having
+numerous bugs that had to be worked out in patch releases.
+
+The chart changes being proposed for Helm v4 are more significant. Mixing those in alongside the
+current chart version handling will have trouble limiting bugs will enabling the changes and keeping
+existing charts functioning properly.
+
+The design specified here is meant to enable the current charts to work as expected while providing
+space for more radical changes.
+
+## Specification
+
+Describe the syntax and semantics of any new feature.
+
+
+
+## Backwards compatibility
+
+Describe potential impact and severity on pre-existing code.
+
+## Security implications
+
+How could a malicious user take advantage of this new feature?
+
+## How to teach this
+
+How to teach users, new and experienced, how to apply the HIP to their work.
+
+## Reference implementation
+
+Link to any existing implementation and details about its state, e.g.
+proof-of-concept.
+
+## Rejected ideas
+
+Why certain ideas that were brought while discussing this HIP were not
+ultimately pursued.
+
+## Open issues
+
+Any points that are still being decided/discussed.
+
+## References
+
+A collection of URLs or materials used as references through the HIP.