docs: Document TUI 4.8.0 known issue (#8697)

* Document TUI known issue

* ci: auto-formatting prettier issues

* Update docs/docs-content/release-notes/known-issues.md

Co-authored-by: Adelina Simion <[email protected]>

* ci: auto-formatting prettier issues

---------

Co-authored-by: svetlana-efimova <[email protected]>
Co-authored-by: Adelina Simion <[email protected]>

Author: svetlana-efimova

docs/docs-content/release-notes/known-issues.md

@@ -16,6 +16,7 @@ The following table lists all known issues that are currently active and affecti
 
 | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Workaround                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | Publish Date       | Product Component            |
 | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------ | ---------------------------- |
+| The [Terminal User Interface (TUI)](../clusters/edge/site-deployment/site-installation/initial-setup.md) introduced in Palette version 4.8.0, using CanvOS version 4.8.0-canvos, does not start automatically on Edge hosts upgraded directly from Palette versions prior to 4.6.32, using CanvOS versions earlier than 4.6.21.                                                                                                                                                                                                                                                                                                                                                                                                                  | Reboot the hosts, or issue the following command on each host: <br />- `systemctl restart palette-tui` for **appliance mode** <br />- `systemctl restart spectro-palette-tui` for **agent mode**                                                                                                                                                                                                                                                                                                                                                                                                                 | November 22, 2025  | Edge                         |
 | Users cannot remove proxy values for connected Edge hosts in Local UI due to a validation error. Proxy values can still be added and updated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | No workaround available.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | October 19, 2025   | Edge                         |
 | On Edge clusters whose hosts run Ubuntu 24.04 with a Unified Kernel Image (UKI), CoreDNS pods may enter the `CrashLoopBackOff` state with logs showing `[FATAL] plugin/loop: Loop (127.0.0.1:<ephemeral-port> -> :53) detected for zone "."`. This happens because `/etc/resolv.conf` is symlinked to `/run/systemd/resolve/stub-resolv.conf`, which lacks real DNS server entries. As a result, CoreDNS forwards DNS queries to itself, creating a recursive loop.                                                                                                                                                                                                                                                                              | Refer to [Troubleshooting - Edge](../troubleshooting/edge/edge.md#scenario---coredns-pods-stuck-in-crashloopbackoff-due-to-dns-loop) for the workaround.                                                                                                                                                                                                                                                                                                                                                                                                                                                         | October 7, 2025    | Edge                         |
 | Due to strict schema adherence enforcement, [Helm charts](../profiles/cluster-profiles/create-cluster-profiles/create-addon-profile/create-helm-addon.md) with parameters that do not exist in the chart schema fail to install on Palette 4.7.15 or later.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Remove parameters that do not exist in the chart schema from the pack values. Alternatively, add the missing parameters to the chart schema or remove the chart schema file entirely.                                                                                                                                                                                                                                                                                                                                                                                                                            | September 20, 2025 | Packs                        |