[Docs][9.0.x] Add known issue about maintenance windows (#222097)

## Summary

Contributes to https://github.com/elastic/response-ops-team/issues/320
by updating the Kibana 9.0.2 and 9.1.0 release notes to include a known
issue about maintenance windows.

**Corresponding PRs**
- Kibana 8.18.x known issues:
https://github.com/elastic/kibana/pull/222096

## Preview
- [Known
issues](https://docs-v3-preview.elastic.dev/elastic/kibana/pull/222097/release-notes/known-issues)

---------

Co-authored-by: Lisa Cawley <lcawley@elastic.co>
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Nastasha Solomon 2025-06-02 14:38:04 -04:00 committed by GitHub
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@ -4,6 +4,18 @@ navigation_title: "Known issues"
# Kibana known issues
::::{dropdown} Errors in rule executions occur when maintenance windows have filters
Applies to: {{stack}} 9.0.0, 9.0.1
**Details**
Errors occur when rules run during an active maintenance window that has filters and a matching rule category.
**Workaround**
Remove any filters added to the active maintenance window.
::::
::::{dropdown} Observability AI assistant gets stuck in a loop when attempting to call the `execute_connector` function
:name:known-issue-1508