managed-by
is set at install time by the managing installer, and should not be templated.
#3389
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app.kubernetes.io/managed-by: Helm
is automatically applied to resources installed by Helm viahelm install
, and does not need to be (read: should not be) manually templated. The label is an install-time label that should be applied by the tool actually installing the resources into the cluster.This matters because
helm template
should (and by default will) produce YAML without this label, as it is unknown at template-time what will "manage" the resource - e.g.helm template | kubectl apply -f -
should not produce resources with theapp.kubernetes.io/managed-by: Helm
label, because the resources are not managed by helm.xref: istio/istio#53698