feat(proto): add deprecated field

_proto/hapi/chart/metadata.proto

@@ -73,4 +73,7 @@ message Metadata {
 
 	// The version of the application enclosed inside of this chart.
 	string appVersion = 13;
+	
+	// Whether or not this chart is deprecated
+	bool deprecated = 14;
 }

docs/charts.md

@@ -54,6 +54,7 @@ maintainers: # (optional)
 engine: gotpl # The name of the template engine (optional, defaults to gotpl)
 icon: A URL to an SVG or PNG image to be used as an icon (optional).
 appVersion: The version of the app that this contains (optional). This needn't be SemVer.
+deprecated: Whether or not this chart is deprecated (optional, boolean)
 ```
 
 If you are familiar with the `Chart.yaml` file format for Helm Classic, you will
@@ -100,6 +101,21 @@ chart may have an `appVersion: 8.2.1`, indicating that the version of Drupal
 included in the chart (by default) is `8.2.1`. This field is informational, and
 has no impact on chart version calculations.
 
+### Deprecating Charts
+
+When managing charts in a Chart Repository, it is sometimes necessary to
+deprecate a chart. The optional `deprecated` field in `Chart.yaml` can be used
+to mark a chart as deprecated. If the **latest** version of a chart in the
+repository is marked as deprecated, then the chart as a whole is considered to
+be deprecated. The chart name can later be reused by publishing a newer version
+that is not marked as deprecated. The workflow for deprecating charts, as
+followed by the [kubernetes/charts](https://github.com/kubernetes/charts)
+project is:
+  - Update chart's `Chart.yaml` to mark the chart as deprecated, bumping the
+  version
+  - Release the new chart version in the Chart Repository
+  - Remove the chart from the source repository (e.g. git)
+
 ## Chart LICENSE, README and NOTES
 
 Charts can also contain files that describe the installation, configuration, usage and license of a

pkg/proto/hapi/chart/metadata.pb.go

@@ -77,6 +77,8 @@ type Metadata struct {
 	Tags string `protobuf:"bytes,12,opt,name=tags" json:"tags,omitempty"`
 	// The version of the application enclosed inside of this chart.
 	AppVersion string `protobuf:"bytes,13,opt,name=appVersion" json:"appVersion,omitempty"`
+	// Whether or not this chart is deprecated
+	Deprecated bool `protobuf:"varint,14,opt,name=deprecated" json:"deprecated,omitempty"`
 }
 
 func (m *Metadata) Reset()                    { *m = Metadata{} }
@@ -100,26 +102,27 @@ func init() {
 func init() { proto.RegisterFile("hapi/chart/metadata.proto", fileDescriptor2) }
 
 var fileDescriptor2 = []byte{
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 }