# Cross-Code Review Report — Job 93a74271

**Job ID**: 93a74271
**Reviewer**: cline
**Date**: 2026-08-23
**Scope**: Track 1R — Docker deployment assets for `nats-server` on a remote server
**Changeset**: 5 new files (`docker/` directory + `requirements.txt`) + 3 modified files (`PRIVATE_SERVER.md`, `implementation_plan.md`, `tests/test_deploy_freshness.py`)

---

## 1. Executive Summary

This review covers the creation of production-ready Docker deployment assets in the `docker/` directory (`docker-compose.yaml`, `nats.conf`, `.env.example`, `README.md`) and the addition of 9 regression guards (D-22 ~ D-30) in `tests/test_deploy_freshness.py`, along with documentation updates to `PRIVATE_SERVER.md` and `implementation_plan.md`.

**Verdict**: PASS. All 5 task objectives are met. The Docker assets are correct, internally consistent, and match the canonical documentation. All 306 tests collect; the 29 deploy-freshness guards (including 9 new) pass, and the fast subset (sanity + tier1_unit, 47 tests) shows no regressions. Findings are limited to documentation consistency issues that do not affect the functionality or security of the deployment assets.

---

## 2. Task Objective Verification

### 2.1 docker/docker-compose.yaml — PASS

| Requirement | Status | Evidence |
|---|---|---|
| `nats:2.12-alpine` service | PASS | Line 9: `image: nats:2.12-alpine` |
| MQTT 1883 | PASS | Line 22: `"${MQTT_BIND:-127.0.0.1}:1883:1883"` |
| NATS 4222 | PASS | Line 23: `"${NATS_BIND:-127.0.0.1}:4222:4222"` |
| WS 8080 | PASS | Line 25: `"${WS_BIND:-127.0.0.1}:8080:8080"` |
| HTTP monitor 8222 (loopback only) | PASS | Line 24: `"127.0.0.1:8222:8222"` (hardcoded) |
| JetStream volume `/data` | PASS | Line 28: `nats-data:/data` |
| Healthcheck | PASS | Lines 29-34: `wget` to `/healthz` on `127.0.0.1:8222` |
| Fail-closed secrets | PASS | Lines 15-18: `${VAR:?error}` syntax for all 4 secrets |
| Log rotation | PASS | Lines 35-37: json-file, 10m max-size, 3 max-file |

**Note**: The previous review (job `e1c4e9c3`) flagged M-1 (Medium): compose omitted NATS 4222 port. This is now **fixed** — `${NATS_BIND:-127.0.0.1}:4222:4222` is present in both `docker/docker-compose.yaml` and the `PRIVATE_SERVER.md` code fence.

### 2.2 docker/nats.conf — PASS

| Requirement | Status | Evidence |
|---|---|---|
| MQTT block | PASS | Lines 23-27: `port: 1883`, `ack_wait: 60s`, `max_ack_pending: 1024` |
| JetStream block | PASS | Lines 15-19: `store_dir: "/data"`, `max_file: 10G`, `max_mem: 256M` |
| Multi-tenant accounts (MAM with mam/observer) | PASS | Lines 55-70: `MAM` account with `mam_agent` + `mam_observer` (sub-only, pub denied) |
| HOME account | PASS | Line 72: `HOME: { jetstream: enabled, users: [...] }` |
| SYS account | PASS | Line 73: `SYS: { users: [...] }` |
| `system_account: SYS` | PASS | Line 75 |
| WebSocket block | PASS | Lines 29-52: `port: 8080`, `no_tls: true`, origin policy, `/mqtt` path docs |
| No hardcoded secrets | PASS | All passwords are `$VAR` references; D-25 guard verifies |

### 2.3 docker/.env.example — PASS

| Requirement | Status | Evidence |
|---|---|---|
| Fail-closed security | PASS | All 4 secrets have empty values (lines 22, 25, 28, 31) |
| Variable definitions | PASS | Each secret has a comment explaining purpose and generation method |
| Bind address variables | PASS | Lines 37-47: `MQTT_BIND`, `NATS_BIND`, `WS_BIND` (commented, default 127.0.0.1) |
| 8222 not variable-ized | PASS | Line 47: explicit note that HTTP monitor is loopback-fixed |
| Git tracking | PASS | `.gitignore` line 23 `!.env.example` exempts it; D-29 guard verifies |

### 2.4 docker/README.md — PASS (with findings — see section 3)

| Requirement | Status | Evidence |
|---|---|---|
| Step-by-step deployment | PASS | Section 3: 5-step quick deploy guide |
| Verification instructions | PASS | Section 5: R-3 port scan; Section 7: R-1~R-10 playbook |
| Network/firewall guidance | PASS | Section 4: UFW rules with Docker bypass warning |
| Client connection guide | PASS | Section 6: MAM `.mam.env` config + MQTT.js dashboard recipe |
| Operations/maintenance | PASS | Section 8: logs, backup, upgrade, monitoring |
| Troubleshooting | PASS | Section 9: 10-row troubleshooting table |

### 2.5 tests/test_deploy_freshness.py — PASS

9 new guards added (D-22 ~ D-30), all passing:

| Guard | What it checks | Result |
|---|---|---|
| D-22 | docker/ assets exist and are populated | PASS |
| D-23 | compose image matches doc and is alpine | PASS |
| D-24 | compose port exposure contract (4 ports, 8222 loopback) | PASS |
| D-25 | secrets are fail-closed (`${VAR:?}` syntax, empty .env.example, $VAR in nats.conf) | PASS |
| D-26 | nats.conf jetstream/mqtt contract (store_dir /data, max_file/max_mem, mqtt 1883, MAM jetstream) | PASS |
| D-27 | observer permissions match `mqtt_common.DEFAULT_TOPIC_ROOT` (`python.mqtt.jobs`) | PASS |
| D-28 | healthcheck contract (wget, /healthz, 127.0.0.1:8222) and alpine coupling | PASS |
| D-29 | env secrets never tracked (`.env` ignored, `.env.example` not ignored) | PASS |
| D-30 | websocket origin policy startable (`no_tls: true`, no `*`, `/mqtt` documented) | PASS |

**D-16 guard change**: Assertion tightened from `"-alpine" in tag or tag.startswith("2.")` to `"alpine" in tag`. Correct — healthcheck requires `wget` only in alpine. All `nats:` references in `PRIVATE_SERVER.md` use `nats:2.12-alpine`; no breakage.

**Test count**: 306 collected (was 297), matching `implementation_plan.md` claim "297 to 306".

---

## 3. Findings

### M-1 (Medium) — R-1~R-10 ID collision between PRIVATE_SERVER.md section 9.4 and docker/README.md section 7; R-11~R-13 undefined

**Category**: Documentation consistency / Loss

The R-1~R-10 verification playbook IDs have **different meanings** in `PRIVATE_SERVER.md` section 9.4 and `docker/README.md` section 7. Key collisions:

| R-ID | PRIVATE_SERVER.md section 9.4 | docker/README.md section 7 |
|---|---|---|
| R-2 | Listener + TLS identity | External monitoring blocked |
| R-4 | Round-trip pub/sub + JetStream | WAN latency |
| R-5 | **Retained terminal event (MQTT)** | **Auth rejection (unauthorized)** |
| R-6 | Broker identity assertion | Auth success (normal) |
| R-7 | Freeze regression (H-1/H-4) | Retained event delivery |
| R-8 | Full regression suite | Broker identity verification |

Only R-1 (health), R-3 (port exposure), R-9 (tenant isolation), and R-10 (retained boundary) share the same concept.

Additionally, `implementation_plan.md` (lines 122, 182) references "R-1 ~ R-13" with "R-5(retained) / R-9(account boundary) / R-13(MQTT-over-WS)" as final gates. However:
- R-11, R-12, R-13 are **never defined** in either `PRIVATE_SERVER.md` section 9.4 or `docker/README.md` section 7.
- The "R-5(retained)" reference matches `PRIVATE_SERVER.md`'s R-5, but **not** `docker/README.md`'s R-5 (auth rejection).
- `PRIVATE_SERVER.md` section 9.5 cutover procedure still says "R-1 ~ R-10" (not R-1~R-13).

**Impact**: An operator following `docker/README.md` who is told to verify "R-5(retained)" would check auth rejection instead of retained event delivery. The undefined R-11~R-13 create ambiguity about what constitutes the final acceptance gate.

**Fix**: Either (a) align the README's R-IDs with `PRIVATE_SERVER.md` section 9.4 (use different ID ranges like RR-1~RR-10 for the README's deployment-focused checks), or (b) define R-11~R-13 in both documents and update section 9.5 to reference R-1~R-13.

### L-1 (Low) — docker/README.md section 7 R-4 references non-existent `latency_check.py`

**Category**: Operability / Loss

`docker/README.md` section 7 R-4 states: `python latency_check.py` with expected result "RTT P95 < 150ms". No such file exists in the repository. `PRIVATE_SERVER.md` section 9.4 defines the latency probe as an inline Python heredoc (not a standalone script). An operator following the README would get a "file not found" error.

**Fix**: Either (a) replace `python latency_check.py` with the inline heredoc from `PRIVATE_SERVER.md` section 9.4, or (b) create `docker/latency_check.py` as a standalone script, or (c) reference the `PRIVATE_SERVER.md` section 9.4 latency probe section.

### L-2 (Low) — docker/README.md section 4 UFW rules more permissive than PRIVATE_SERVER.md section 9.3

**Category**: Documentation consistency

`docker/README.md` section 4 uses `sudo ufw allow in on tailscale0 to any` (allows all ports on the tailnet interface), while `PRIVATE_SERVER.md` section 9.3 uses granular per-port rules (`port 1883`, `port 4222`, `port 8080`). Both are valid for a trusted tailnet, but the README's approach is less defense-in-depth. The README also omits the 4222 UFW rule that `PRIVATE_SERVER.md` section 9.3 includes.

**Fix**: Align the README's UFW rules with `PRIVATE_SERVER.md` section 9.3's per-port approach, or add a note explaining the intentional difference.

### V-1 (Very Low) — implementation_plan.md P0.5 step indentation

**Category**: Cosmetic

The new P0.5 step in the roadmap diagram uses slightly different indentation alignment than the surrounding steps. Purely cosmetic; does not affect readability of the plan.

---

## 4. Cross-Reference Verification

### 4.1 docker/ files vs PRIVATE_SERVER.md code fences

| File | Method | Result |
|---|---|---|
| `docker/nats.conf` vs `PRIVATE_SERVER.md` section 9.1 code fence | Programmatic byte-level comparison | **EXACT MATCH** |
| `docker/docker-compose.yaml` vs `PRIVATE_SERVER.md` section 9.2 code fence | Programmatic byte-level comparison | **EXACT MATCH** |

The D-22~D-30 guards provide structural verification but not a full byte-level diff. The manual programmatic comparison confirms zero drift between the canonical files and the documentation code fences.

### 4.2 Topic root consistency

`mqtt_common.DEFAULT_TOPIC_ROOT` = `"python/mqtt/jobs"` -> dotted form = `"python.mqtt.jobs"`.
`docker/nats.conf` observer `subscribe: { allow: ["python.mqtt.jobs.>"] }` — matches. D-27 guard verifies this programmatically.

### 4.3 .gitignore verification

- `docker/.env` -> ignored by `.gitignore` line 21 (`.env` pattern). D-29 guard passes.
- `docker/.env.example` -> not ignored (`.gitignore` line 23 `!.env.example` overrides line 22 `.env.*`). D-29 guard passes.
- `.env.example` lines 4-5 reference `.gitignore:23` and `.gitignore:21` — line numbers verified correct.

### 4.4 Previous review findings (job e1c4e9c3) — resolution status

| Previous Finding | Status | Evidence |
|---|---|---|
| M-1: section 9.2 compose omits NATS 4222 port | **FIXED** | Both `docker/docker-compose.yaml` and `PRIVATE_SERVER.md` section 9.2 include `${NATS_BIND:-127.0.0.1}:4222:4222` |
| V-2: Unchecked M2b guard checkbox | **FIXED** | `implementation_plan.md` line 180: `- [x]` for guards G-D5~G-D9, G-R1, G-R2 (290 to 297) |
| L-1/L-2 (lib.sh latency, handle_startup_dialogs timeout) | Out of scope | Not part of this changeset |
| L-3 (D-19 regex scans full markdown) | Still present | D-19 unchanged; not part of this changeset |

---

## 5. Test Results

| Suite | Tests | Result |
|---|---|---|
| `tests/test_deploy_freshness.py` (full) | 29 | **29 passed** (12.16s) |
| `tests/test_sanity.py` + `tests/test_tier1_unit.py` | 47 | **47 passed** (16.99s) |
| Full collection | 306 | 306 collected (0.04s) — matches `implementation_plan.md` "297 to 306" |
| Full suite (`tests/`) | 306 | Not completed (integration/e2e tests with MQTT exceed 30s timeout; not affected by this changeset) |

**No regressions detected** in the fast subset. The D-16 guard tightening is validated by all 29 deploy-freshness tests passing.

---

## 6. Security Review

| Check | Status |
|---|---|
| No hardcoded secrets in any file | PASS — All passwords are `$VAR` references; D-25 guard verifies |
| Fail-closed on missing secrets | PASS — `${VAR:?error}` compose syntax; empty `.env.example` values |
| 8222 (HTTP monitor) loopback-only | PASS — Hardcoded `127.0.0.1:8222:8222`, not variable-ized |
| Default bind addresses are loopback | PASS — `${MQTT_BIND:-127.0.0.1}`, `${NATS_BIND:-127.0.0.1}`, `${WS_BIND:-127.0.0.1}` |
| `.env` never tracked in git | PASS — `.gitignore` + D-29 guard |
| WebSocket `no_tls: true` explicit | PASS — Prevents startup failure from implicit TLS requirement |
| No `*` in `allowed_origins` | PASS — D-30 guard verifies; comment explains NATS rejects `*` |
| Observer publish denied | PASS — `publish: { deny: [">"] }` in nats.conf; D-27 guard verifies |

---

## 7. Conclusion

The implementation fully satisfies all 5 task objectives. The Docker deployment assets are production-ready, internally consistent, and match the canonical documentation byte-for-byte. The 9 new regression guards (D-22~D-30) provide comprehensive structural verification of the deployment contract. The previous review's M-1 finding (missing 4222 port) is resolved.

The findings (1 Medium, 2 Low, 1 Very Low) are all documentation consistency issues that do not affect the functionality or security of the deployment assets. They can be addressed with minor documentation edits without rework.

[VERDICT: PASS]