[Helm] Selector labels are not unique among deamonsets

[sboschman]

The Helm chart allows you to define multiple daemonsets, which each a unique name. The (pod) selector for all daemonsets is the same though:

{{/*
Selector labels
*/}}
{{- define "x509-certificate-exporter.selectorLabels" -}}
app.kubernetes.io/name: {{ include "x509-certificate-exporter.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end -}}

Which links every pod to every daemonsets, which is a but unfortunate.

Perhaps we can use the app.kubernetes.io/component label to differentiate between pods from different daemonsets?
(add app.kubernetes.io/component to the spec.selector.matchLabels set and to spec.template.metadata.labels set)

As the chart already supports podExtraLabels per daemonset, another option would be to add some sort of extraSelectorLabels option and let the chart user create unique selector labels.