During and post launch monitoring plan for Japanese docs site

Shortly after go-live of the JA docs site, we need to monitor and verify it's operational. Here is the to-do check list for the launch day 2025-12-10 (December 10, 2025)

• Stay online and actively monitor the Japanese docs site (https://docs.gitlab.com/ja/)
• Click through key pages and verify functionality: e.g. navigation, language selector, and verifiable items from this list: https://handbook.gitlab.com/handbook/marketing/localization/tech_docs_localization/#multilingual-hugo-docs-implementation
• Verify that the English docs site is not negatively affected by JA launch
• Selectively / randomly verify closed issues from the following previously completed QA (Pre-launch Tech Docs Localized QA (localization#150)), and document any issues that resurface, by starting a thread in the current issue
• Monitor English docs MRs in production projects: architecture.md?ref_type=heads#docs-site-architecture
• Monitor Translation MRs in production projects and verify that pipelines are passing successfully (No new Translation MRs will be pushed within localization#112 on the launch week. List of current open MRs on production can be tracked by author @jcole-ext and title Translated Documentation Push: GITTECHA