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Add initial AppNet baseline release note - #5894

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Sanya Kochhar (SanyaKochhar) wants to merge 4 commits into
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SanyaKochhar:kochhars/appnet-baseline-release-note
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Add initial AppNet baseline release note#5894
Sanya Kochhar (SanyaKochhar) wants to merge 4 commits into
Azure:masterfrom
SanyaKochhar:kochhars/appnet-baseline-release-note

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Summary

Adds an initial customer-facing release note for AppNet (Azure Kubernetes Application Networking — the multicluster Application Networking / service mesh offering), covering customer-impacting changes since March 2026. This is the first AppNet release note.

It is added as a distinct top-level ## AppNet Release Notes - 2026-08-05 section at the top of CHANGELOG.md, kept separate from the existing asm-1-XX "Istio-based service mesh add-on" entries since AppNet is a distinct product.

Notes for reviewers

  • Placement / naming: opening as a draft to confirm with the changelog owner whether a distinct top-level AppNet section is the right home, versus interleaving into a dated AKS release section.
  • Provenance: because AppNet PRs did not carry customer-impact labels for this window, entries were derived by reviewing customer-impacting AppNet work merged since March 2026 plus the version history. Best-effort — a couple of items may warrant refinement.
  • Region list under Announcements should be confirmed against the authoritative AppNet region availability before merge.

Content

  • Announcements/retirements: AppNet 1.0–1.2 retired; public-preview region expansion.
  • Features: single-network multicluster mesh; private cluster support; overlapping-CIDR support for private gateways.
  • Behavioral changes: cascade delete; join-time prerequisite validation; Gateway API CRD conflict resolution; resource-move blocked.
  • Bug fixes: 6 customer-facing mesh/provisioning fixes.
  • Component updates: AppNet 1.3→Istio 1.28.8, 1.4→Istio 1.29.4, 1.5 (Istio 1.30) now available.

Adds an initial customer-facing release note for AppNet (Azure Kubernetes
Application Networking), covering customer-impacting changes since March 2026.
Added as a distinct top-level section, separate from the existing asm-1-XX
Istio-based service mesh add-on entries.
Comment thread CHANGELOG.md Outdated
Comment thread CHANGELOG.md Outdated
Comment thread CHANGELOG.md Outdated
Comment on lines +18 to +19
* **Private cluster support.** AppNet members can now be joined on private AKS clusters; the mesh control plane connects over the cluster's private FQDN when the public FQDN is disabled.
* **Overlapping CIDR support for private gateways.** A new pod-route init container removes the previous restriction that member and gateway pod CIDRs could not overlap, so private multicluster egress works across clusters with overlapping address space.

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need confirmation

Comment thread CHANGELOG.md Outdated
Comment thread CHANGELOG.md Outdated
Comment thread CHANGELOG.md

### Behavioral changes

* Deleting an AppNet resource now cascade-deletes its child members instead of failing when members still exist, so cleanup no longer requires manually removing members first.

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is this one working as expected right? cc: deveshdama

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3 participants