OSDOCS-14822 UDN NetObserv Content

[gwynnemonahan]

OSDOCS-14822 UDN NetObserv Content

Version(s):
Merge to only the no-1.9 branch - no cherrypicks are required.
I will open one PR against main to incorporate all of the NetObserv content just before its GA.

Cherry-pick to OCP 4.12, 4.14, 4.16+

Issue:
https://issues.redhat.com/browse/OSDOCS-14822

Link to docs preview:

• User-defined networks concept: https://94271--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/observing-network-traffic.html#network-observability-user-defined-networks_nw-observe-network-traffic
• User-defined networks procedure: https://94271--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/observing-network-traffic.html#network-observability-working-with-udn_nw-observe-network-traffic

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Wed Jun 11 19:43:10 - Prow CI generated the docs preview:

https://94271--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/observing-network-traffic.html

[Amoghrd]

/assign @jpinsonneau @jotak

[Amoghrd]

I dont know if we have to explain in detail about creating UDN/CUDN here. Could we link to the networking docs for UDN?

[jpinsonneau]

I dont know if we have to explain in detail about creating UDN/CUDN here. Could we link to the networking docs for UDN?

+1 to that. If we can avoid maintaining their CRs in our doc it would be easier

[Amoghrd]

/label qe-approved

[gwynnemonahan]

/label peer-review-needed

[jeana-redhat]

Nice work! Some minor stuff here to look at.

/remove-label peer-review-in-progress
/remove-label peer-review-needed
/label peer-review-done

[jeana-redhat]

Suggested change

	User-defined networks (UDN) improve the flexibility and segmentation capabilities of the default Layer 3 topology for a Kubernetes pod network by enabling custom Layer 2 and Layer 3 network segments, where all these segments are isolated by default. These segments act as either primary or secondary networks for container pods and virtual machines that use the default OVN-Kubernetes CNI plugin.
	User-defined networks (UDN) improve the flexibility and segmentation capabilities of the default Layer 3 topology for a Kubernetes pod network by enabling custom Layer 2 and Layer 3 network segments, where all these segments are isolated by default. These segments act as primary or secondary networks for container pods and virtual machines that use the default OVN-Kubernetes CNI plugin.

[gwynnemonahan]

Someone will probably want to update that here then, too, so it's consistent: https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/networking/multiple-networks#about-user-defined-networks

[gwynnemonahan]

/label merge-review-needed

[gwynnemonahan]

Squashed commit. Checks running again.

[openshift-ci]

@gwynnemonahan: all tests passed!

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