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Namespace names must be RFC 1123 DNS labels 

The how-to docs to create a new namespace already specify this, but I think it's worth mentioning in the overview doc that a namespace name must be an RFC 1123 label, as I didn't initially think to look in the how-to doc for limitations.
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Adrian Ludwin 2022-01-13 12:10:06 -05:00 committed by GitHub
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content/en/docs/concepts/overview/working-with-objects/namespaces.md
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@ -98,6 +98,9 @@ is local to a namespace. This is useful for using the same configuration across
multiple namespaces such as Development, Staging and Production. If you want to reach
across namespaces, you need to use the fully qualified domain name (FQDN).
As a result, all namespace names must be valid
[RFC 1123 DNS labels](/docs/concepts/overview/working-with-objects/names/#dns-label-names).
## Not All Objects are in a Namespace
Most Kubernetes resources (e.g. pods, services, replication controllers, and others) are