Add metrics port to containerSpec (#19479)

WIthout a metrics port given in the container spec, prometheus scraping annotations would not scrape the correct port. See https://github.com/prometheus/prometheus/issues/3826#issuecomment-380736580 for details.

Signed-off-by: Tammo van Lessen <tvanlessen@gmail.com>

stable/kured/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: "1.2.0"
 description: A Helm chart for kured
 name: kured
-version: 1.4.1
+version: 1.4.2
 home: https://github.com/weaveworks/kured
 maintainers:
   - name: plumdog

stable/kured/README.md

@@ -36,3 +36,14 @@ extraArgs:
   bar-baz: 2
 ```
 becomes `/usr/bin/kured ... --foo=1 --bar-baz=2`.
+
+## Prometheus Metrics
+
+Kured exposes a single prometheus metric indicating whether a reboot is required or not (see [kured docs](https://github.com/weaveworks/kured#prometheus-metrics)) for details. It can be scraped with the following set of annotations:
+
+```yaml
+podAnnotations:
+  prometheus.io/scrape: "true"
+  prometheus.io/path: "/metrics"
+  prometheus.io/port: "8080"
+```

stable/kured/templates/daemonset.yaml

@@ -61,6 +61,9 @@ spec:
             - --{{ $key }}
             {{- end }}
           {{- end }}
+          ports:
+            - containerPort: 8080
+              name: metrics          
           env:
             # Pass in the name of the node on which this pod is scheduled
             # for use with drain/uncordon operations and lock acquisition