Add CP30 runbook: EKS Auto Mode component logging

[masrafp-moj]

What this adds

A customer-facing runbook page explaining the EKS Auto Mode component logging that runs on every CP30 cluster: what it captures, where the logs are, how to view them, and the one behaviour worth knowing (log types enable one at a time). Part of #8430.

Why

Auto Mode component logging (Karpenter, EBS CSI, Load Balancer Controller, VPC CNI) is enabled on all clusters but was undocumented for engineers. This gives them a single page answering "where are my Auto Mode logs and how do I read them", matching the runbook added for private cluster access.

Files

• source/cp30/eks-auto-mode-logging.html.md.erb — new page
• source/cp30/index.html.md.erb — linked from the CP30 index, next to the EKS Auto Mode page

What the page covers

• The four log types and what each is useful for troubleshooting
• Log group naming (/aws/vendedlogs/eks/cluster/<LOG_TYPE>/<cluster>) and 30-day retention
• How to view logs (console and CLI)
• How it works, grounded in the real Terraform (cluster/eks-cluster.tf and the gate script)
• The "one update at a time" sequencing behaviour, explained gently
• Cost, troubleshooting, and links to related pages

Notes for reviewers

• S3 archive is marked "in progress", not live. The S3 delivery destination is in a separate open PR (#19252) and not yet on main, so the page flags it as coming rather than documenting it as deployed. The S3 section gets fleshed out once #19252 merges — this page is intentionally ahead of that.
• Grounded in the merged code on main (eks-cluster.tf uses the EKS Auto Mode logging: sequence log type enablement reliably #8501 update gate; four log types at 30-day retention).
• Please confirm it renders in the docs preview before merge — not previewed with the Middleman build locally.

Related

• PoC: EKS Auto Mode enhanced logging — CloudWatch Vended Logs for managed components #8430 — the Auto Mode logging ticket this documents
• EKS Auto Mode logging: sequence log type enablement reliably #8501 — the sequencing gate the page refers to (merged)
• #19252 — Tom's S3 delivery destination (open)