diff --git a/docs/post-mortems/2026-06-01-cloudflared-stale-traefik-origin.md b/docs/post-mortems/2026-06-01-cloudflared-stale-traefik-origin.md
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+# Post-Mortem: Cloudflare Tunnel Pointed at Traefik's Old LB IP → Full External 502
+
+| Field | Value |
+|-------|-------|
+| **Date** | 2026-06-01 |
+| **Duration** | Misconfiguration latent since 2026-05-30 08:09Z (Traefik LB-IP move). Confirmed external outage in cloudflared logs from ~20:58Z; root-caused and fixed at 21:15Z; all pods converged by 21:16Z. Detection→fix window ~17 min. |
+| **Severity** | SEV1 — *every* Cloudflare-proxied hostname (`viktorbarzin.me` + all `*.viktorbarzin.me`) returned HTTP 502 to external clients. Internal/LAN access was unaffected (split-horizon → Traefik direct), which is why it stayed hidden. |
+| **Affected Services** | All external ingress: viktorbarzin.me, nextcloud, vault, authentik, vaultwarden, immich, linkwarden, nas, technitium, terminal, speedtest, and every other proxied app. |
+| **Issue** | None filed (diagnosed and fixed in-session). |
+| **Status** | Resolved. |
+| **Recurrence count** | 1st of this kind. Same *class* as the 2026-06-01 forgejo-registry `.200→.203` redirect breakage (containerd mirror) — both are fallout from the 2026-05-30 Traefik LB-IP move leaving a hard-coded `10.0.20.200` reference behind. |
+
+## Summary
+
+On 2026-05-30 (commit `0c01adac`) Traefik was moved off the shared MetalLB IP `10.0.20.200` onto its own dedicated IP `10.0.20.203` (with `externalTrafficPolicy: Local`). The Cloudflare tunnel's ingress rules — Terraform-managed in `stacks/cloudflared/modules/cloudflared/cloudflare.tf` — still routed `*.viktorbarzin.me` and `viktorbarzin.me` to `https://10.0.20.200:443`. After the move, nothing serves HTTPS on `.200:443` (the shared IP keeps only the non-HTTP LB services: postgresql-lb, headscale, wireguard, coturn, xray). cloudflared therefore could not reach its origin (`connect: no route to host` / `i/o timeout`), and Cloudflare returned 502 for the entire public surface.
+
+The fix: repoint both ingress rules at the in-cluster Traefik **Service DNS** `https://traefik.traefik.svc.cluster.local:443` — the design the docs already *described* (CLAUDE.md "Networking" §) but which the code never actually implemented. Service DNS decouples the tunnel from the LB IP, so a future Traefik IP change cannot reproduce this.
+
+## Impact
+
+- **User-facing**: 100% of externally-reachable services returned 502 via Cloudflare. LAN/internal access (which resolves `*.viktorbarzin.me` → `10.0.20.203` via Technitium split-horizon, bypassing Cloudflare) kept working — this masked the outage.
+- **Blast radius**: every proxied hostname. Origin (Traefik) was healthy the entire time — purely a tunnel-origin routing fault.
+- **Data loss**: none.
+- **Collateral**: Vault's own public hostname (`vault.viktorbarzin.me`) was also 502, creating a bootstrap problem for the fix — `terragrunt apply` needs Vault for the PG state-backend creds, but Vault was only reachable via the broken tunnel from the dev box. Worked around with a temporary `/etc/hosts` entry pointing `vault.viktorbarzin.me` → `10.0.20.203` (internal Traefik), removed after the apply.
+
+## Root Cause
+
+A hard-coded LB IP (`10.0.20.200`) in the tunnel origin survived the Traefik dedicated-IP migration. The 2026-05-30 migration updated Traefik's Service and the split-horizon DNS but did not grep for every consumer of the old `.200` HTTPS endpoint. The cloudflared tunnel origin (and, separately, the containerd forgejo-registry redirect — fixed earlier the same day in `42db69a2`) were missed.
+
+Contributing factors:
+- **Docs described intent as reality.** CLAUDE.md stated cloudflared targets `traefik.traefik.svc.cluster.local:443` "so proxied apps are decoupled from the LB IP." The code used a raw IP. The doc gave false confidence that the decoupling existed.
+- **No guard** tied the tunnel origin to Traefik's actual address; a stale value plans/applies cleanly.
+- **Detection gap (masking).** Split-horizon means LAN users never see external-only breakage. The `[External]` Uptime-Kuma monitors + `ExternalAccessDivergence` alert are the only signal for this failure mode.
+
+## Timeline (UTC)
+
+| Time | Event |
+|------|-------|
+| **2026-05-30 08:09** | Commit `0c01adac` — Traefik moves to dedicated LB IP `10.0.20.203`. `.200:443` stops serving HTTPS. Tunnel origin still `.200`. Outage latent from here. |
+| **2026-06-01 ~20:51** | Keel auto-patches the cloudflared image; all 3 pods roll (coincidental — not the cause; the misconfig predates it). |
+| **2026-06-01 ~20:58** | cloudflared logs show every proxied hostname failing: `originService=https://10.0.20.200:443 … no route to host / i/o timeout`. |
+| **2026-06-01 ~21:08** | User reports "no ingress coming in." Investigation starts. |
+| **21:09** | Isolated: origin healthy (direct to `.203` → 200/302), public path → 502. cloudflared logs pin origin to dead `.200:443`. |
+| **21:10** | Confirmed tunnel config is Terraform-managed (`cloudflare_zero_trust_tunnel_cloudflared_config.sof`), origin = `.200` on both ingress rules. |
+| **21:13** | Vault unreachable via public name (circular dep); worked around with temp `/etc/hosts` → `.203`. `tg init -reconfigure` (rotated PG backend creds). |
+| **21:15:25** | Targeted apply: both ingress origins → `https://traefik.traefik.svc.cluster.local:443`. `Apply complete! 1 changed`. |
+| **21:15:34–50** | cloudflared pushes config `version=253`; pods converge. |
+| **21:16** | 10/10 curls to `viktorbarzin.me` → 200; 0 `.200` errors across all pods; `vault.viktorbarzin.me` via real Cloudflare path → 200. Temp hosts entry removed. Resolved. |
+
+## Resolution
+
+Changed both `ingress_rule` blocks in `cloudflare.tf` from `https://10.0.20.200:443` to `https://traefik.traefik.svc.cluster.local:443` (`no_tls_verify = true` retained). Applied surgically with `-target` on the tunnel config resource only, to avoid touching two pre-existing, unrelated drift items the full plan surfaced (see below).
+
+## Pre-existing drift (NOT part of this incident, left untouched)
+
+The full `cloudflared` stack plan showed two extra in-place changes, deliberately **not** applied:
+1. `kubernetes_deployment.cloudflared` — TF would strip Keel's runtime annotations (`keel.sh/policy|pollSchedule|trigger|update-time`). The deployment ignores `dns_config` but not `metadata.annotations`, so Keel's enrollment annotations look like drift. Self-healing (Keel re-adds within its 1h poll), but a clean fix is to add `metadata[0].annotations` (and the template equivalent) to `ignore_changes`, or codify the policy annotation in TF.
+2. `cloudflare_record.mail_domainkey_rspamd` — cosmetic re-chunking of the DKIM TXT record (identical key, different 255-char split). Benign.
+
+## Action Items
+
+- [x] Repoint tunnel origin to Traefik Service DNS (this fix).
+- [x] Post-mortem written; CLAUDE.md networking claim is now actually true.
+- [ ] **Pin exact outage-start** via Uptime-Kuma `[External]` monitor history / `ExternalAccessDivergence` firing time (confirm whether it began at the 05-30 move and went unnoticed, or at a later tunnel re-apply).
+- [ ] **Verify `ExternalAccessDivergence` is wired to a channel that gets seen** — this is the only alert that catches external-only breakage; it apparently did not prompt action for ≤2.5 days.
+- [ ] **Migration checklist**: when an LB IP changes, grep the whole repo for the old IP before declaring done (this and the forgejo redirect were both missed `.200` references on 2026-05-30).
+- [ ] (Optional) Address the cloudflared Keel-annotation drift so the stack plans clean.
+
+## Lessons
+
+- Reference shared infra (Traefik) by **stable Service DNS, not LB IP**, from anything that can use cluster DNS. IPs are migration landmines.
+- Keep docs honest: a doc that describes intended design as current reality hides exactly this class of bug.
+- External-only outages are invisible from the LAN (split-horizon). The `[External]` divergence signal is load-bearing — it must be trustworthy and seen.
diff --git a/stacks/cloudflared/modules/cloudflared/cloudflare.tf b/stacks/cloudflared/modules/cloudflared/cloudflare.tf
index b5eb0490..ad4d9de8 100644
--- a/stacks/cloudflared/modules/cloudflared/cloudflare.tf
+++ b/stacks/cloudflared/modules/cloudflared/cloudflare.tf
@@ -74,18 +74,22 @@ resource "cloudflare_zero_trust_tunnel_cloudflared_config" "sof" {
     warp_routing {
       enabled = true
     }
-    # Wildcard rule routes all subdomains through tunnel to Traefik.
-    # Traefik handles host-based routing via K8s Ingress resources.
+    # Wildcard rule routes all subdomains through the tunnel to Traefik,
+    # which handles host-based routing via K8s Ingress resources.
+    # Origin = in-cluster Traefik Service DNS (NOT a MetalLB LB IP) so the
+    # tunnel is decoupled from LB-IP changes. A raw IP here caused a full-site
+    # 502 on 2026-06-01 when Traefik moved 10.0.20.200 -> .203; see
+    # docs/post-mortems/2026-06-01-cloudflared-stale-traefik-origin.md.
     ingress_rule {
       hostname = "*.viktorbarzin.me"
-      service  = "https://10.0.20.200:443"
+      service  = "https://traefik.traefik.svc.cluster.local:443"
       origin_request {
         no_tls_verify = true
       }
     }
     ingress_rule {
       hostname = "viktorbarzin.me"
-      service  = "https://10.0.20.200:443"
+      service  = "https://traefik.traefik.svc.cluster.local:443"
       origin_request {
         no_tls_verify = true
       }