Add dedicated article for Limit data export rule

[claude]

Requested by Anastasiia Popova · Slack thread

Before: The Limit data export rule had no page of its own. It was mentioned only as one bullet inside Control over Export to Cloud, among four other export controls. A reader who opened the rule-creation dialog in Wallarm Console and saw the Full data export dropdown had nowhere to look up what its three values do, and the rule was absent from the Rules & Policies navigation where every other rule type is listed.

After: The rule has a dedicated article, Limiting Data Export, in the Rules & Policies section next to Sensitive Data Masking. It states what the rule controls, lists the three Full data export modes and what the Node exports in each, carries the dialog's own warning that the setting applies to both request and response data, names the visibility that limiting export costs (attack and incident details, API Sessions, security issues, Threat Replay Testing accuracy), points to the Mask sensitive data rule as the narrower alternative for individual sensitive parameters, and gives the creation steps with a screenshot of the dialog. The export-to-cloud guide now links to it from the existing bullet, so the overview stays a summary and the detail lives in one place.

How: New page at docs/latest/user-guides/rules/limit-data-export-rule.md, wrappers in docs/6.x/ and docs/7.x/, nav entries in mkdocs-6.x.yml and mkdocs-7.x.yml, entries in the four llms.md/llms.txt indexes, inbound links from docs/latest/admin-en/export-to-cloud.md and the Rules WAF overview, and the screenshot at images/user-guides/rules/limit-data-export-rule.png (cropped to the dialog form; the help sidebar was dropped because it carried text-selection highlighting). Not added to 5.0 — that version directory is frozen and does not even contain export-to-cloud.md. No what-is-new.md entry and no subscription-plans.md row: this documents an existing capability rather than shipping a new one.

Open items for review

• Conflict with the existing 6.12.4 note. docs/latest/admin-en/export-to-cloud.md currently states that starting from NGINX Node 6.12.4 the rule preserves the request structure and masks only the values, and that metadata-only export is the earlier behavior. The description used for this article (and the in-product help text in the dialog) describes metadata-only as the current Disabled behavior. Both cannot be right. I documented the behavior as described and left that admonition untouched — please confirm which is current so the two pages can be reconciled in this PR.
• Rule category in the Console. Sibling articles write the creation step as Choose <category> → <rule> (for example Change requests/responses → Mask sensitive data). The screenshot does not show which category Limit data export sits under, so the step reads simply Choose **Limit data export**. Tell me the category and I will match the sibling pattern.
• No version requirements stated. Nothing in the source material or the repo establishes a minimum NGINX Node / Native Node version for the three modes, so the article carries no version table. Add one if the modes are version-gated.
• Keep headers wording. Documented as "metadata and headers", per Anastasiia's confirmation. Deliberately silent on bodies and query parameters in that mode, since she did not state anything about them.

Verification

• zensical build -f mkdocs-6.x.yml — clean, "No issues found"; new page renders, image loads, all internal links and anchors resolve.
• zensical build -f mkdocs-7.x.yml — clean, "No issues found"; page present at /7.x/user-guides/rules/limit-data-export-rule/.
• scripts/check_markdown_companions.py — 0 missing, both versions (after scripts/generate_raw_markdown.py).
• scripts/check_redirects_budget.py — 24 of 100 charged rules, unchanged by this PR (no renames or deletions, so no redirect needed).

🤖 Generated with Claude Code

https://claude.ai/code/session_01K14sT9Ka6i82VZQ9dsjLxw

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
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[AnastasiaTWW]

also describe when a customer should use the "Limit data export" rule and when "Mask sensitive data" instead