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docs/update: add Host OS upgrade section (TCR-877)#187

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docs/update: add Host OS upgrade section (TCR-877)#187
zztalker wants to merge 1 commit into
cloudlinux:masterfrom
zztalker:TCR-877-host-os-upgrade-section

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Title:
docs/update: add Host OS upgrade section (TCR-877)

Body:

Summary

Adds a new Host OS upgrade section to docs/update/README.md that documents the --post-os-upgrade flag in i360deploy.sh / imav-deploy.sh (deploy script v2.152).

The flag automates recovery after a host OS upgrade (e.g. Ubuntu 22.04 → 24.04) leaves the Imunify APT repository .list files pointing at the previous OS version — previously customers had to manually edit the repos before apt-get update would work again.

Also rewrites the existing stale hint under Production ("release-upgrade will require manually edit Imunify repositories before enabling them") into a tip box that cross-references the new section.

Related

Preview

The new section renders under /update/#host-os-upgrade on docs.imunify360.com.

Documents the new --post-os-upgrade flag in i360deploy.sh and
imav-deploy.sh (script v2.152), which automates recovery after a
host OS upgrade (e.g. Ubuntu 22.04 -> 24.04) leaves the APT repo
.list files pointing at the previous OS version.

Also rewrites the existing stale hint under Production ("release-upgrade
will require manually edit Imunify repositories before enabling them")
into a tip box that cross-references the new section.

Related: TCR-877, DEF-42362, defence360 MR !471.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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