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compat: Update cross-client compat doc#27199

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scottn12:updatePolicyDoc
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compat: Update cross-client compat doc#27199
scottn12 wants to merge 1 commit intomicrosoft:mainfrom
scottn12:updatePolicyDoc

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Description

Small follow-ups from #27064

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Hi! Thank you for opening this PR. Want me to review it?

Based on the diff (1 lines, 1 files), I've queued these reviewers:

  • Correctness — logic errors, race conditions, lifecycle issues
  • Security — vulnerabilities, secret exposure, injection
  • API Compatibility — breaking changes, release tags, type design
  • Performance — algorithmic regressions, memory leaks
  • Testing — coverage gaps, hollow tests

Toggle the reviewer checkboxes above to adjust, then tick the box below to start:

  • Start review

| --- | --- | --- | --- |
| Telemetry Event | `MinVersionForCollabWarning` | Clients are joining with a version below your configured minimum, but are still able to understand the document's data format and therefore continue to collaborate. | If you see this warning message, it's likely a sign you updated `minVersionForCollab` too quickly. In future releases, ensure proper [saturation](#terminology) before updating. If these warning messages are ignored, you may risk seeing the below error in the future. |
| `DataProcessingError` | `Document can't be opened with current version of the code` | An out-of-window client tried to join and was blocked due to being unable to collaborate with the newer client's document. | If this was unexpected, lower `minVersionForCollab` so newly-created documents will admit older clients. **Note:** documents whose schema has already been elevated by a higher-`minVersionForCollab` writer may continue to block older clients on those specific documents — lowering the configured value does not retroactively undo the elevation in the document's persisted schema. |
| `DataCorruptionError` | `Summary metadata mismatch` | An older client (before 2.0.0-rc.3.0.0) tried to load a document with `explicitSchemaControl` enabled. The older client is blocked to prevent data corruption. | Update the affected client to 2.0 or later. This signal only affects very old clients; modern cross-client enforcement surfaces through `MinVersionForCollabWarning` and the `DataProcessingError` row above. |
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I would phrase the What it means similar to the previous entry to make it more customer focused and less tehnical - something like - An older out-of-window client (before 2.0.0-rc.3.0.0) tried to join and was blocked due to being unable to collaborate with the newer client's document.

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