Add audits for accessing posts without membership

[Combs7th]

@claude, Let's update the Mattermost Product Documentation to note that audit logs now record when a user accesses posts or content in a channel they are not a member of from Mattermost server v11.5.0 onward, captured via Engineering PR #31266 (link: mattermost/mattermost#31266)

Before proposing any changes:

• First, make an assessment on whether or not a doc update is even necessary for this PR.
• If it is necessary: Identify the existing admin and end user documentation page(s) most closely related.
• Analyze the writing style, tone, structure, headings, and formatting patterns used on those pages.
• Focus only on the audit logging behavior visible to admins.

When drafting updates:

• Match the existing voice and writing patterns of the page as closely as possible.
• Follow the same heading hierarchy and formatting conventions already in use.
• Avoid introducing new sections unless absolutely necessary.
• Identify the Mattermost documentation pages that describe audit logging.
• Add a short note explaining that starting in v11.5.0, audit logs include an indicator when a user accesses channel content without being a member of that channel.
• Mention the audit field non_channel_member_access and that it will be set to true in these cases.

Focus the docs update on:

• What has changed from the relevant persona’s perspective
• Where this change is surfaced in the product or UI
• When or why the persona would need to be aware of this change

DO NOT suggest changes to the following docs pages:

• changelogs
• important upgrade notes
• version archive
• removed and deprecated features
• unsupported legacy releases

[claude]

Claude finished @Combs7th's task in 2m 5s —— View job • claude/issue-8775-20260305-2356 • Create PR ➔

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Analysis and Tasks

• Gather context and understand the request
• Read CLAUDE.md for repo-specific instructions (no CLAUDE.md found)
• Find existing audit logging documentation pages
• Analyze writing style, tone, and structure of relevant pages
• Draft and implement documentation update
• Commit and push changes

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Assessment: A documentation update is necessary. The non_channel_member_access field is new audit log metadata that admins need to know about to interpret audit trail entries correctly.

Page updated: source/administration-guide/comply/embedded-json-audit-log-schema.rst

Changes made:

1. JSON schema overview — Added non_channel_member_access: false to the meta object in the top-level schema with an inline comment explaining when it is set to true.

2. Posts & Content Events section — Added a .. note:: block after the event table explaining that from v11.5.0, this field appears in the meta object and is set to true when a user accesses channel content without being a member, along with guidance on how admins can use this for access review.

3. EventMeta data model table — Added a new row documenting non_channel_member_access as an optional boolean field available from v11.5.0, with a description of when it is populated.

[Combs7th]

Done.