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

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Upstream sources — mattermost-lts

service image source repo releases / changelog
app mattermost/mattermost-team-edition https://github.com/mattermost/mattermost https://docs.mattermost.com/about/mattermost-changelog.html
postgres postgres https://github.com/postgres/postgres https://www.postgresql.org/docs/release/

Standing notes

  • mattermost-lts tracks the 11.7 ESR (Extended Support Release) = Mattermost's LTS line. The "LTS" concept in Mattermost is ESR; there is NO "10.x LTS line". Release calendar (endoflife.date/mattermost):
    • 10.11 = previous ESR, security support ends 2026-08-15 (~7 weeks) — migrated away 2026-06-19
    • 11.7 = current ESR, supported through 2027-05-15 (~11 months); latest patch: 11.7.6 (2026-06-25)
    • 11.8.x = innovation release (3-month lifecycle, EOL 2026-09-15) — do NOT target
    • 10.12 = innovation release, support EXPIRED 2025-12-15 (do NOT target, despite abra listing 10.12.4)
    • Check the release lifecycle at https://endoflife.date/mattermost before each upgrade run.
    • Next ESR after 11.7 expected ~February 2027 (9-month cadence) The release-11.7 Docker Hub floating tag always points to the latest 11.7.x patch. IMPORTANT: Do NOT use 11.7.0–11.7.2 — they have a schemeid migration bug in the roles table when upgrading from 10.11.17+; use 11.7.3 or later (current: 11.7.6).
    • 2026-06-26 re-check (endoflife.date/mattermost, data 2026-06-27): 11.7.6 released 2026-06-25 (Low–Medium security fixes, no breaking changes / no migrations) is the newest 11.7.x patch — REFRESH target from 11.7.5 → 11.7.6. 10.11 ESR security support ends 2026-08-15 (~7 weeks); 10.12 innovation ENDED 2025-12-15 (do NOT target, despite the survey listing 10.12.4); 11.8 innovation EOL 2026-09-15. GitHub release: https://github.com/mattermost/mattermost/releases/tag/v11.7.6
    • Survey-correction log: the 2026-06-26 orchestrator survey claimed "10.x is LTS, target 10.12.4, 11.x is non-LTS". That is incorrect — Mattermost has no "10.x LTS line"; the LTS concept is ESR, the ESR line jumped 10.11 → 11.7 in May 2026, and 10.12 is an EXPIRED innovation release. Both the 2026-06-19 and 2026-06-22 runs correctly identified 11.7 ESR as the LTS target; this run re-confirms it. The survey's recommendation would have regressed the recipe onto an unsupported branch — DO NOT follow it.
  • postgres: stay on 15-alpine for now. The upgrade to 16-alpine requires a major-version migration (pg_upgrade or dump/restore with operator involvement) because the stack runs with a persistent postgres_data volume. A 16 container against pg15 PGDATA crashes on startup. Major pg bump is a separate operator-guided step.
  • Backup format (as of PR #2 / upcoming 3.0.0+11.7.5 release): pg_backup.sh Docker config on the postgres service. Backup: pg_dump | gzip → backup.sql. Restore: terminate connections, FORCE-drop, recreate DB, reimport dump. DROP DATABASE WITH (FORCE) requires PostgreSQL 13+ — safe on postgres:15-alpine. The previous inline-label approach (no restore hook) was a defect: raw PGDATA restore without a reload was a silent no-op. Fixed in PR #2 (restore fix cherry-picked from PR #1 ci/pg-restore).