upstream(mattermost-lts): 2026-09-04 re-check note (ESR still 11.7/11.7.10, PR #2 re-verify)

cc-ci-plan/upstream/mattermost-lts.md

@@ -103,6 +103,18 @@
     2026-08-15 (upstream main still pins 10.11.22 = EXPIRED ESR → the 10→11 ESR move PR #2 carries
     remains required; Mattermost docs: ESR→ESR is "fully supported and tested"). postgres 15-alpine
     still HELD (DB-major out of scope, operator dump/pg_upgrade).
+  - **2026-09-04 re-check** (endoflife.date/api/mattermost.json 2026-09-04; Mattermost release-policy
+    docs `https://docs.mattermost.com/product-overview/release-policy.html`; `mattermost-server-releases.html`;
+    GitHub releases `v11.7.10`): **11.7 ESR is STILL the current supported ESR/LTS line** — "v11.7 &
+    Desktop App v6.2 Extended Support: 2026-05-15 → 2027-05-15" (the chart on the release-policy page;
+    ESR cadence = every 9 months, supported 12 months). Latest 11.7.x patch **11.7.10** (2026-08-26,
+    "Mattermost Platform Extended Support Release 11.7.10 contains various bug fixes") — NOT a
+    prerelease; target confirmed. 11.8/11.9/11.10 remain Feature/innovation releases (EOL 2026-09-15 /
+    10-15 / 11-15, `lts:false`), NOT ESR — do NOT target; wait for the NEXT official ESR (expected
+    ~Feb 2027 on the 9-month cadence). No newer 11.7.x ESR patch exists as of this week, so PR #2's
+    head (`59e8c2c`, app image `11.7.10`) is still the correct target → this run RE-VERIFIES PR #2
+    (no new app bump). 11.11.0-rc1/rc2 seen on GitHub but innovation + pre-release — not a target.
+    postgres 15-alpine still HELD (DB-major out of scope, operator dump/pg_upgrade).
 
 ## NVD CPE fallback
 This project publishes nothing machine-readable we can reach — no GitHub advisory feed,