codeant-ai-for-open-source[bot] commented on PR #35298:
URL: https://github.com/apache/superset/pull/35298#issuecomment-3893651211
## **Sequence Diagram**
This PR updates UPDATING.md to document that the legacy APP_ICON config is
deprecated and the frontend now uses THEME_DEFAULT.token.brandLogoUrl for
custom logos. The diagram shows the upgrade/migration success path and how the
frontend resolves the logo.
```mermaid
sequenceDiagram
participant Admin
participant superset_config as "superset_config.py"
participant Frontend
Admin->>superset_config: Previously set APP_ICON = "/static/.../logo.png"
note right of superset_config: After PR 31590 APP_ICON is ignored
Admin->>superset_config: Replace with THEME_DEFAULT.token.brandLogoUrl
superset_config->>Frontend: Expose THEME_DEFAULT.token.brandLogoUrl
Frontend-->>Admin: Render custom logo from brandLogoUrl
```
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