docs: multi-node airgap documentation

[lennessyy]

Describe the Change

This PR documents the multi-node feature in 4.5.a.

Changed Pages

💻 Link hosts
Scale a Cluster
Delete a Cluster

Jira Tickets

🎫 PE-5212

Backports

Can this PR be backported?

• No. Please leave a short comment below about why this PR cannot be backported.

[github-actions]

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[github-actions]

🚫 [vale] _{reported by reviewdog 🐶}
[Vale.Spelling] Did you really mean 'mins'?

[abhinavnagaraj]

Leader hosts cannot be unlinked directly. When all followers are unlinked, the leader is automatically unlinked if its not "in-use"(not part of a single node cluster).

[vault-token-factory-spectrocloud]

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[karl-cardenas-coding]

@lennessyy Really good content. I'm just having some issues groking the leader concept. Could you take a peek and help me 🙏🏻

[karl-cardenas-coding]

Adding a note here for us to remember to replace with version number

[karl-cardenas-coding]

Nice catch 😄

[karl-cardenas-coding]

Suggested change

	tokens with its IP and a One-Time Password (OTP) credentials that you can use to link other nodes.
	tokens with its IP address and a One-Time Password (OTP) credentials that you can use to link other nodes.

[karl-cardenas-coding]

Hmmm....I think this concept of all control-plane nodes being leader nodes is a bit confusing. I'm not sure I understand what being a leader means here. I drew out a visual to help me understand. Is a leader here in the context of LocaUI's scope? Maybe if I understood what a leader does/is responsible for it would help me? 😅

[lennessyy]

Abhinav noted this in his review that all control plane nodes are considered leaders once a cluster is formed so I added that in. Now that i think about it, it is a bit confusing.

I think instead of saying that, it's probably better if we decouple the control plane concepts with the leader concepts. I think what Abhi said was more in the context of "all the control plane nodes have access to cluster management features", which in a group of linked nodes, only leader nodes have access to. But if you delete that cluster, there will still only be one leader to which all the other nodes are going to be linked. I will confirm this with him