docs: add proxy webhook guardrail documentation

[akhilmmenon]

Summary

• Documents the new executeOnProxy parameter for webhook guardrails, enabling webhook checks on proxy (/v1/*) passthrough requests
• Adds requestInfo field (method, path, contentType) to the webhook request body schema and proxy as a new requestType value
• Documents proxy-specific limitations: deny-only mode (transforms ignored), JSON-only content type requirement, and all-checks-must-opt-in constraint
• Updates the guardrail checks list and enterprise changelog entry

Related Gateway PR: https://github.com/Portkey-AI/gateway/pull/1920

Changes

File	What changed
integrations/guardrails/bring-your-own-guardrails.mdx	Added Execute on Proxy to parameters table, executeOnProxy in inline config example, requestInfo object in request body schema, proxy requestType, new "Webhook Guardrails on Proxy Requests" section, transform caveat notes
product/guardrails/list-of-guardrail-checks.mdx	Added executeOnProxy: boolean to Webhook row parameters
changelog/enterprise.mdx	Expanded v2.20.0 entry with deny-only and JSON-only details, updated link to new proxy-specific section

Test plan

• Verified rendered output via Mintlify preview in PR

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Project	Status	Preview	Updated (UTC)
portkey-docs	🟢 Ready	View Preview	Sep 2, 2026, 9:34 AM

[Copilot]

🟢 Approval recommended

The documentation is consistent, complete, and correctly cross-linked.

Pull request overview

Documents proxy-route support for webhook guardrails across integration docs, guardrail references, and enterprise release notes.

Changes:

• Documents executeOnProxy and proxy webhook payload metadata.
• Explains deny-only, JSON-only, and opt-in constraints.
• Links the enterprise changelog to the detailed guide.

File summaries

File	Description
integrations/guardrails/bring-your-own-guardrails.mdx	Adds proxy configuration, schema, examples, and limitations.
product/guardrails/list-of-guardrail-checks.mdx	Lists the new webhook parameter.
changelog/enterprise.mdx	Expands and links the proxy webhook release entry.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Balanced

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