In the current v1.6rc docs, under the heading extensions the sample for labels references the v1.5 label expose rather than the v1.6 label enable.
<StatelessServiceType ServiceTypeName="WebServiceType">
<Extensions>
<Extension Name="Traefik">
<Labels xmlns="http://schemas.microsoft.com/2015/03/fabact-no-schema">
<Label Key="traefik.frontend.rule.example2">PathPrefixStrip: /a/path/to/strip</Label>
<!-- This should be enable -->
<Label Key="traefik.expose">true</Label>
<!-- This should be enable -->
<Label Key="traefik.frontend.passHostHeader">true</Label>
</Labels>
</Extension>
</Extensions>
</StatelessServiceType>
In the current v1.6rc docs, under the heading extensions the sample for labels references the v1.5 label
expose
rather than the v1.6 labelenable
.