tasks/OPS/OPS_task_17_rabbitmq_dlq_topology_mgmt.md

---
id: OPS_task_17_rabbitmq_dlq_topology_mgmt
name: RabbitMQ DLQ 路由黑洞 CLI×Management UI 联合溯源
category: OPS
timeout_seconds: 1800
---

## Prompt
Task background: The order-system SRE has received an alert — the `orders.dlq` dead-letter queue depth is stuck at 0, yet the `orders` ingress publish rate is steady at ~20 msg/s, and the main consumer queue `orders.q` shows a deliver/ack rate clearly below publish, with the gap persistently ≥ 4 msg/s — roughly 30% of "poison" orders, after being nack'd, neither land in the DLQ nor get redelivered in place; they silently disappear inside the broker. The warmup has already pinned the scene:

- RabbitMQ Server listens on `127.0.0.1:5672` (AMQP) and `127.0.0.1:15672` (management plugin HTTP API + Management control panel), credentials `guest:guest`, the business runs under the default vhost `/`, and `rabbitmq_management` is already enabled.
- The producer / consumer background daemons are running (pid files `/tmp_workspace/state/rmq_producer.pid`, `rmq_consumer.pid`, stdout in the same directory as `*.out`); the producer continuously pushes ~20 msg/s into the topic exchange `orders`, of which about 30% have routing key `orders.poison` (which the consumer nacks 100%).
- Three core queues in the topology: `orders.q` (main consumer, bound on `orders` / `orders.#`, declared with `x-dead-letter-exchange=orders.dlx`), `orders.dlq` (dead-letter, bound on `orders.dlx`), and `orders.audit` (side-channel audit, a distractor).
- The real fault is buried in the routing key of the `orders.dlx → orders.dlq` binding: the `x-dead-letter-routing-key` declared on `orders.q` does not literally match the routing key of that binding — the topic exchange finds no match, and all nack'd messages fall into the black hole.

Task goal: produce a "diagnosis + fix + re-verification" report ready to paste straight into the post-mortem channel; all artifacts go under `/tmp_workspace/results/`; the evidence must cross-validate two channels — broker-side text/JSON dumps and Management control-panel screenshots.

### Hard constraints for the main deliverable `diagnosis.json`

- All 10 schema fields must be present: `vhost` / `broken_binding_source` / `broken_binding_destination` / `broken_binding_routing_key` / `expected_routing_key` / `remediation` / `dlq_depth_before_fix` / `dlq_depth_after_fix` / `publish_rate_msgps` / `deliver_rate_msgps`.
- `expected_routing_key` must equal `dead.unrouted` exactly.
- `broken_binding_routing_key` must hit the literal `dead.routed` value (taken from the broker's real binding table).
- `remediation` must contain both `dead.unrouted` and the word `bind` / `binding`.
- `dlq_depth_before_fix ∈ [0, 5]`, `dlq_depth_after_fix ≥ 20`, `publish_rate_msgps ≥ 5`, `deliver_rate_msgps ≥ 0`; all four numbers must come from real samples — fabrication is not allowed.

### Companion deliverables (under `/tmp_workspace/results/`)

| File | Requirement |
|---|---|
| `01_rmq_status.txt` | Broker liveness snapshot; must contain the string `RabbitMQ` and identifier lines such as node name / version / enabled plugins |
| `02_queues.txt` | Queue listing for vhost `/`; must contain all three lines `orders.q` / `orders.dlq` / `orders.audit`, with the `orders.dlq` row's messages count ≤ 5 |
| `03_bindings.txt` | Full binding-table dump; must contain the row with source=`orders.dlx` and destination=`orders.dlq`, whose routing_key field falls under `dead.routed.*` (the literal mismatch is the root-cause evidence) |
| `04_queue_args.txt` | Complete queue arguments for `orders.q`; must contain the field name `x-dead-letter-routing-key` with value `dead.unrouted` |
| `05_rates_t0.json` + `05_rates_t1.json` | Two `orders.q` rate snapshots separated by ≥ 5 s, structurally aligned with the `message_stats` subtree of `/api/queues/<vhost>/<name>`, containing `publish_details.rate` and `deliver_get_details.rate` (or `deliver_details.rate`); at least one of them must show `publish - deliver_get` ≥ 4 msg/s |
| `06_remediation.sh` | Mitigation script that re-binds `orders.dlx → orders.dlq` to a routing key that matches `dead.unrouted` (the literal `dead.unrouted` or the `#` wildcard); the text must also contain `dead.unrouted` together with at least one binding-action keyword among `declare binding` / `Add binding` / `queue_bind` / `x-dead-letter-routing-key`; the script must be re-entrant |
| `07_bindings_after.txt` | Binding-table dump taken after running `06_remediation.sh`; must contain both `orders.dlx` and `orders.dlq`, with the routing_key field containing `dead.unrouted` |
| `08_queues_after.txt` | Queue snapshot taken after the fix and after waiting ≥ 10 s; the `orders.dlq` row's messages count must be ≥ 20 |
| `postmortem.md` | ≥ 600 characters; must contain all four section headings `## 时间线` / `## 根因` / `## 修复` / `## 跨通道证据链`; must hit ≥ 5 of the seven keywords `dead-letter` / `binding` / `routing key` / `broker` / `management` / `dlx` / `topic` |
| `cross_channel.json` | `{"switches": int, "trace": [...]}`, with `switches ≥ 5`, `trace` length ≥ 5, of which entries starting with `STRUCT:` and `VISUAL:` are each ≥ 2; entry names should be aligned with the on-disk files `03_bindings.txt` / `04_queue_args.txt` / `07_bindings_after.txt` / `08_queues_after.txt` and `view_02` / `view_04` / `view_06` / `view_07` |

### Seven workflow screenshots (fixed filenames, under `/tmp_workspace/results/`)

Real screenshots of the **same** RabbitMQ Management control panel. Common spec: each ≥ 1024×700 real pixels, ≥ 30 KB, not a flat-color collage; grading runs OCR keyword checks and a VLM rubric, so the file contents must be self-consistent with what the filename describes.

- `view_01_mgmt_overview.png`: Management Overview home page; the Queued messages summary panel and the Message rates line chart must both be readable.
- `view_02_mgmt_rates_tooltip.png`: On top of the Overview's Message rates line chart, **overlay a hover tooltip popover** (popover rectangle + numbers); the instantaneous numbers for both the publish and deliver curves must be readable — visually align the publish-vs-deliver gap to the same moment in time.
- `view_03_mgmt_queues.png`: Queues list page; the three rows `orders.q` / `orders.dlq` / `orders.audit` are laid out together, and the Ready / Total messages columns for `orders.dlq` clearly read near 0.
- `view_04_dlq_bindings.png`: The Bindings sub-panel on the `orders.dlq` queue detail page; the "From exchange" column contains `orders.dlx`, and the **broken literal value** (shaped like `dead.routed.*`) in the "Routing key" column is directly visible — this single misconfigured binding row is the visual exposure surface.
- `view_05_dlx_detail.png`: The `orders.dlx` exchange detail page, with the Bindings sub-panel (pointing to `orders.dlq`) and the Message rate sub-panel visible on the same screen.
- `view_06_mgmt_overview_after.png`: Same viewpoint as `view_01`, re-captured **after the fix and after waiting ≥ 10 s**; in the Queued messages summary, the `orders.dlq` count is clearly non-zero (≥ 20).
- `view_07_dlq_after.png`: Aligned with the viewpoints of `view_03` / `view_04`; after the fix, the Ready / Total messages count for `orders.dlq` is ≥ 20, and the newly added binding row is visible in the Bindings sub-panel.

### Anti-cheating and runtime constraints

- The producer / consumer must stay running until all artifacts are collected; you may not `kill` the processes whose pids are in `/tmp_workspace/state/rmq_producer.pid` and `rmq_consumer.pid`, otherwise during re-verification the publish rate and DLQ growth will both go to zero.
- You may not copy any file under `/tmp_workspace/gt/` into `results/` (detected via hash comparison).
- Text/JSON dumps must come from real broker queries (`rabbitmqctl` / `rabbitmqadmin` / management API); you may not just `echo` / `cat` the literal values given in the task to fabricate file contents.

## Expected Behavior

设计意图与典型解题路径（仅供出题人参考，不发给 agent）：

1. 工具通道自由，不强制走某一种：broker 端结构化取证可走 `rabbitmqctl` / `rabbitmqadmin` / Management HTTP API（`curl http://127.0.0.1:15672/api/...` + `guest:guest` Basic Auth）；控制面截图走 Management Web UI（默认 `http://127.0.0.1:15672`）。两条通道都要走，单走任何一条都形成不了证据链。
2. step 1：取 broker 状态与队列列表（`01_rmq_status.txt` / `02_queues.txt`），看到 `orders.dlq` messages ≤ 5 但 `orders.audit` 仍在涨——首发异常信号。
3. step 2：dump 全量 bindings（`03_bindings.txt`）+ `orders.q` 的 queue arguments（`04_queue_args.txt`），把 `x-dead-letter-routing-key=dead.unrouted` 与 `orders.dlx → orders.dlq` binding 的 `dead.routed.*` 字面值对齐 → 锁定根因（不是缺 binding，是 routing key 字面值不匹配；topic exchange 不会把 `dead.routed.#` 当通配匹配 `dead.unrouted`）。
4. step 3：间隔 ≥ 5 s 采两次 `/api/queues/%2F/orders.q` JSON（`05_rates_t0/t1.json`），确认 `publish - deliver_get` gap ≥ 4 msg/s；同时在 Web UI Overview 的 Message rates 图上 hover 出 tooltip 截 `view_02`，把同一 gap 视觉化对齐。
5. step 4：补齐 `view_01` / `view_03` / `view_04` / `view_05` 四张修复前截图，确认根因在 UI 上同样可见。
6. step 5：写 `06_remediation.sh`：声明一条新的 `orders.dlx → orders.dlq` binding，routing key 用 `dead.unrouted`（或 `#` 通配），脚本可重入（如 `rabbitmqadmin declare binding ...` 或 `rabbitmqctl eval` + `queue_bind`）；执行后等 ≥ 10 s 让 producer 持续灌入的中毒消息把 DLQ 涨到 ≥ 20。
7. step 6：复采 `07_bindings_after.txt` / `08_queues_after.txt`，截 `view_06` / `view_07` 修复后视图作为对比证据。
8. step 7：写 `diagnosis.json`（10 字段，数值都从前面真实采样里取）、`postmortem.md`（≥ 600 字符 + 4 段标题 + ≥ 5 关键词）、`cross_channel.json`（trace 同时引用 STRUCT 与 VISUAL 两类证据条目）收尾。

约束说明（actions.log 反作弊）：
- `actions.log` / 操作轨迹中不得通过 `echo` / `printf` / `cat <<EOF` 直接构造 `02_queues.txt` / `03_bindings.txt` / `04_queue_args.txt` / `07_bindings_after.txt` / `08_queues_after.txt` 的内容来伪造数值；这些文件必须能在轨迹中追溯到对应的 broker 查询命令或 HTTP 请求。
- `view_*` 截图必须来自真实 Management UI 渲染，禁止 PIL 拼接 / 文本渲染伪造（VLM rubric 会对截图真实性打分）。

评分要点（hard gates，从 grader cap 反推）：
- 结构通道齐全：`bindings_broken_visible ≥ 0.5`（`03_bindings.txt` 含 `orders.dlx` / `orders.dlq` / `dead.routed`）、`queue_args_expected_rk ≥ 0.4`（`04_queue_args.txt` 含 `x-dead-letter-*`）、`bindings_after_ok ≥ 0.4`（`07_bindings_after.txt` 含新 binding 行）；任一不满足则总分被 cap 到 0.4。
- 视觉通道齐全：7 张截图至少一半通过尺寸/色彩/真实性校验；不满足则总分被 cap 到 0.4。
- 修复后量化证据：`08_queues_after.txt` 中 `orders.dlq` ≥ 20，且 VLM 在 `view_06` / `view_07` 上能确认 DLQ 已涨；不满足则被 cap 到 0.55。
- 速率 gap 真实采到（两次中至少一次 `publish - deliver ≥ 4 msg/s`）且 `cross_channel.json` 满足 `switches ≥ 5` + STRUCT/VISUAL 各 ≥ 2；不满足则被 cap 到 0.6。
- VLM rubric 平均分 ≥ 0.6（管理 UI 真实性 / rates tooltip / bindings 子面板 / 修复后图表）；不满足被 cap 到 0.55。

## Source

- RabbitMQ Dead Letter Exchanges 官方文档
  https://www.rabbitmq.com/dlx.html
- RabbitMQ Management plugin 文档
  https://www.rabbitmq.com/management.html
- Stack Overflow 实例：DLX with topic exchange + routing key mismatch
  https://stackoverflow.com/questions/45726833/
- 对应 EyesOn-Bench OPS 维度：O17 — message-broker DLQ routing
  triage via rabbitmqctl bindings × Management UI rate-chart tooltip

## Grading Criteria

- [ ] 1. `01_rmq_status.txt` 含 RabbitMQ + 节点信息
- [ ] 2. `02_queues.txt` 三个核心队列都在；`orders.dlq` messages ≈ 0
- [ ] 3. `03_bindings.txt` 含 source=orders.dlx + destination=orders.dlq
       行；routing_key 字段含 `dead.routed`
- [ ] 4. `04_queue_args.txt` 含 `x-dead-letter-routing-key`
       + `dead.unrouted`
- [ ] 5. `05_rates_t0.json` + `05_rates_t1.json` 都是合法 JSON 且
       publish - deliver_get ≥ 4 msg/s
- [ ] 6. `view_01_mgmt_overview.png` 存在 ≥ 800×600，OCR 命中
       "RabbitMQ"/"Overview"/"Queued messages" 之一
- [ ] 7. `view_02_mgmt_rates_tooltip.png` 存在；VLM 能识别 chart
       tooltip 浮窗
- [ ] 8. `view_03_mgmt_queues.png` 存在；OCR 命中
       "orders"/"Queues"/"Messages" 之一
- [ ] 9. `view_04_dlq_bindings.png` 存在；VLM 能识别 bindings 子面板
- [ ] 10. `view_05_dlx_detail.png` 存在
- [ ] 11. `diagnosis.json` 10 字段全在；
        `expected_routing_key` 等于 `dead.unrouted`
- [ ] 12. `06_remediation.sh` 含 `dead.unrouted` + 绑定动作
- [ ] 13. `07_bindings_after.txt` 含新绑定行
- [ ] 14. `08_queues_after.txt` 中 `orders.dlq` messages ≥ 20
- [ ] 15. `view_06_mgmt_overview_after.png` 存在
- [ ] 16. `view_07_dlq_after.png` 存在
- [ ] 17. `postmortem.md` ≥ 600 字符 + 关键词 ≥ 5/7 + 4 段标题齐
- [ ] 18. `cross_channel.json` switches ≥ 5；CLI/GUI 各 ≥ 2
- [ ] 19. Hard gate：缺 CLI/GUI 任一通道证据 → 封顶 0.4

## Automated Checks

```python
def grade(workspace_path=None, **kwargs) -> dict:
    """OPS_task_17 grader: RabbitMQ DLQ routing-key mismatch triage via
    broker management HTTP API structured evidence and Management UI
    visual screenshots. Sub-scores cover topology dump quality, rate-gap
    quantification, screenshot presence + OCR + VLM, the binding
    fix evidence, post-fix DLQ growth, diagnosis JSON, postmortem
    quality, and cross-channel switch count."""
    import json, re
    from pathlib import Path
    rd = Path("/tmp_workspace/results")
    gt_dir = Path("/opt/ops17_gt") if Path("/opt/ops17_gt/expected.json").exists() else Path("/tmp_workspace/gt")
    s = {}
    expected = {}
    if (gt_dir / "expected.json").exists():
        try: expected = json.loads((gt_dir / "expected.json").read_text())
        except Exception: expected = {}
    main_q = expected.get("main_queue", "orders.q")
    dlq = expected.get("dlq_queue", "orders.dlq")
    dlx = expected.get("dlx_exchange", "orders.dlx")
    expect_rk = expected.get("expected_dead_letter_routing_key_on_queue",
                             "dead.unrouted")
    broken_rk = expected.get("broken_dlx_binding_routing_key",
                             "dead.routed.#")
    req_keys = expected.get("report_required_keys", [])
    min_dlq_growth = int(expected.get("min_dlq_growth_after_fix", 20))

    def _read(name):
        p = rd / name
        return p.read_text(errors="ignore") if p.exists() else ""

    # 1. status
    st = _read("01_rmq_status.txt")
    s["rmq_status_present"] = 1.0 if st and "RabbitMQ" in st else (0.4 if st else 0.0)

    # 2. queues snapshot — three queues + dlq ~0
    qs = _read("02_queues.txt")
    has_three = (main_q in qs and dlq in qs and "orders.audit" in qs)
    dlq_zero = False
    for ln in qs.splitlines():
        if dlq in ln:
            nums = re.findall(r"\b\d+\b", ln)
            if nums:
                try:
                    if int(nums[0]) <= 5:
                        dlq_zero = True
                except Exception:
                    pass
    if has_three and dlq_zero:
        s["queues_initial_anomaly"] = 1.0
    elif has_three:
        s["queues_initial_anomaly"] = 0.6
    elif qs:
        s["queues_initial_anomaly"] = 0.3
    else:
        s["queues_initial_anomaly"] = 0.0

    # 3. bindings show broken routing key
    bnd = _read("03_bindings.txt")
    has_broken = (dlx in bnd and dlq in bnd
                  and re.search(r"dead\.routed", bnd) is not None)
    s["bindings_broken_visible"] = 1.0 if has_broken else (0.5 if (dlx in bnd and dlq in bnd) else 0.0)

    # 4. queue arguments expose x-dead-letter-*
    qa = _read("04_queue_args.txt")
    if qa and "x-dead-letter-routing-key" in qa and expect_rk in qa:
        s["queue_args_expected_rk"] = 1.0
    elif qa and "x-dead-letter" in qa:
        s["queue_args_expected_rk"] = 0.5
    else:
        s["queue_args_expected_rk"] = 0.0

    # 5. rate gap quantified
    def _rates(name):
        try:
            d = json.loads(_read(name) or "{}")
        except Exception:
            return None, None
        ms = d.get("message_stats", {}) or {}
        pub = ms.get("publish_details", {}).get("rate")
        deliv = ms.get("deliver_get_details", {}).get("rate")
        if deliv is None:
            deliv = ms.get("deliver_details", {}).get("rate")
        return pub, deliv
    p0, d0 = _rates("05_rates_t0.json")
    p1, d1 = _rates("05_rates_t1.json")
    gap_ok = False
    try:
        gaps = []
        for p, d in [(p0, d0), (p1, d1)]:
            if p is not None and d is not None:
                gaps.append(float(p) - float(d))
        if gaps and max(gaps) >= 4.0:
            gap_ok = True
        elif gaps and max(gaps) >= 1.5:
            s["rate_gap_observed"] = 0.6
    except Exception:
        pass
    if gap_ok:
        s["rate_gap_observed"] = 1.0
    elif "rate_gap_observed" not in s:
        s["rate_gap_observed"] = 0.3 if (p0 is not None or p1 is not None) else 0.0

    # 6. screenshots existence + size
    shots = ["view_01_mgmt_overview.png",
             "view_02_mgmt_rates_tooltip.png",
             "view_03_mgmt_queues.png",
             "view_04_dlq_bindings.png",
             "view_05_dlx_detail.png",
             "view_06_mgmt_overview_after.png",
             "view_07_dlq_after.png"]
    def _real_shot(p):
        if not p.exists() or p.stat().st_size < 30000:
            return False
        try:
            from PIL import Image
            im = Image.open(p)
            w, h = im.size
            if w < 1024 or h < 700:
                return False
            ex = im.convert("RGB").getextrema()
            return max(hi - lo for lo, hi in ex) > 60
        except Exception:
            return False
    present = sum(1 for n in shots if _real_shot(rd / n))
    s["gui_screenshots_count"] = present / len(shots)

    # 7. OCR
    ocr_hits = 0
    try:
        import pytesseract
        from PIL import Image
        kws = {
            "view_01_mgmt_overview.png":
                ["RabbitMQ", "Overview", "Queued messages", "Message rates",
                 "Connections"],
            "view_02_mgmt_rates_tooltip.png":
                ["msg/s", "publish", "deliver", "redeliver", "ack"],
            "view_03_mgmt_queues.png":
                ["orders.dlq", "orders.audit", "Ready"],
            "view_04_dlq_bindings.png":
                ["orders.dlx", "dead.routed", "Routing key"],
            "view_05_dlx_detail.png":
                ["Exchange", "orders.dlx", "Bindings", "Message rate"],
            "view_06_mgmt_overview_after.png":
                ["RabbitMQ", "Overview", "Queued messages", "Message rates"],
            "view_07_dlq_after.png":
                ["orders.dlq", "Ready"],
        }
        for n, ks in kws.items():
            p = rd / n
            if p.exists():
                try:
                    tx = pytesseract.image_to_string(Image.open(p))
                    if any(k in tx for k in ks): ocr_hits += 1
                except Exception:
                    pass
        s["gui_screenshots_ocr"] = ocr_hits / len(shots)
    except ImportError:
        s["gui_screenshots_ocr"] = 0.5

    # 8. diagnosis JSON
    diag = rd / "diagnosis.json"
    diag_keys_score = 0.0; diag_rk = 0.0; diag_rem = 0.0
    if diag.exists():
        try:
            d = json.loads(diag.read_text())
            def _numok(v, lo, hi=None):
                try:
                    x = float(v)
                    return x >= lo and (hi is None or x <= hi)
                except Exception:
                    return False
            num_ok = (_numok(d.get("dlq_depth_before_fix"), 0, 5)
                      and _numok(d.get("dlq_depth_after_fix"), min_dlq_growth)
                      and _numok(d.get("publish_rate_msgps"), 5)
                      and _numok(d.get("deliver_rate_msgps"), 0))
            present_keys = sum(1 for k in req_keys if k in d and d.get(k) not in (None, "", 0))
            diag_keys_score = (present_keys / max(1, len(req_keys))) * (1.0 if num_ok else 0.4)
            if str(d.get("expected_routing_key", "")).strip() == expect_rk:
                diag_rk = 1.0
            elif expect_rk in str(d.get("expected_routing_key", "")):
                diag_rk = 0.7
            rem = str(d.get("remediation", ""))
            if expect_rk in rem and ("bind" in rem.lower() or "binding" in rem.lower()):
                diag_rem = 1.0
            elif expect_rk in rem:
                diag_rem = 0.6
        except Exception:
            pass
    s["diagnosis_keys"] = diag_keys_score
    s["diagnosis_routing_key_match"] = diag_rk
    s["diagnosis_remediation_match"] = diag_rem

    # 9. remediation script
    rem = _read("06_remediation.sh")
    rem_ok = False
    if rem and expect_rk in rem and re.search(
        r"declare\s+binding|Add\s+binding|queue_bind|x-dead-letter-routing-key",
            rem, re.I):
        rem_ok = True
    s["remediation_script_ok"] = 1.0 if rem_ok else (0.5 if rem else 0.0)

    # 10. bindings after — new row visible
    ba = _read("07_bindings_after.txt")
    # Tolerate any whitespace/column-separator (tab, multi-space, JSON commas)
    # between dlx, dlq, and expect_rk on the same logical row.
    _row_re = rf"{re.escape(dlx)}[^\n]*{re.escape(dlq)}[^\n]*{re.escape(expect_rk)}"
    if ba and dlx in ba and dlq in ba and expect_rk in ba and re.search(_row_re, ba):
        s["bindings_after_ok"] = 1.0
    elif ba and dlx in ba and dlq in ba and expect_rk in ba:
        s["bindings_after_ok"] = 0.6
    elif ba and dlx in ba:
        s["bindings_after_ok"] = 0.4
    else:
        s["bindings_after_ok"] = 0.0

    # 11. DLQ growth
    qa2 = _read("08_queues_after.txt")
    dlq_count = 0
    for ln in qa2.splitlines():
        if dlq in ln:
            nums = re.findall(r"\b\d+\b", ln)
            if nums:
                try:
                    dlq_count = max(dlq_count, int(nums[0]))
                except Exception:
                    pass
    if dlq_count >= min_dlq_growth:
        s["dlq_growth_after_fix"] = 1.0
    elif dlq_count >= max(5, min_dlq_growth // 2):
        s["dlq_growth_after_fix"] = 0.6
    else:
        s["dlq_growth_after_fix"] = 0.2 if qa2 else 0.0

    # 12. postmortem
    pm = _read("postmortem.md")
    pm_chars = len(pm)
    s["postmortem_length"] = 1.0 if pm_chars >= 600 else pm_chars / 600.0
    pm_kws = expected.get("expected_postmortem_keywords",
                          ["dead-letter", "binding", "routing key",
                           "broker", "management", "dlx", "topic"])
    hits = sum(1 for k in pm_kws if k.lower() in pm.lower())
    s["postmortem_keywords"] = hits / max(1, len(pm_kws))
    sects = expected.get("expected_postmortem_sections",
                         ["## 时间线", "## 根因", "## 修复",
                          "## 跨通道证据链"])
    sect_hits = sum(1 for h in sects if h in pm)
    s["postmortem_sections"] = sect_hits / max(1, len(sects))

    # 13. cross-channel switches
    cc = rd / "cross_channel.json"
    cc_ok = 0.0
    if cc.exists():
        try:
            d = json.loads(cc.read_text())
            sw = int(d.get("switches", 0))
            tr = d.get("trace", [])
            required_struct = {"03_bindings.txt", "04_queue_args.txt", "07_bindings_after.txt", "08_queues_after.txt"}
            required_visual = {"view_02_mgmt_rates_tooltip.png", "view_04_dlq_bindings.png", "view_06_mgmt_overview_after.png", "view_07_dlq_after.png"}
            struct_refs = sum(1 for x in tr if isinstance(x, str) and x.startswith("STRUCT:") and any((rd / f).exists() for f in required_struct if x.split(":", 1)[1] in f or f.startswith(x.split(":", 1)[1])))
            visual_refs = sum(1 for x in tr if isinstance(x, str) and x.startswith("VISUAL:") and any((rd / f).exists() for f in required_visual if x.split(":", 1)[1] in f or f.startswith(x.split(":", 1)[1])))
            cc_ok = 1.0 if (sw >= 5 and len(tr) >= 5 and struct_refs >= 2 and visual_refs >= 2) else (0.4 if sw >= 3 else 0.0)
        except Exception:
            pass
    s["cross_channel_switches"] = cc_ok

    # 14. VLM rubric
    try:
        from _judge_helper import vlm_score_rubric
    except Exception:
        vlm_score_rubric = None
    vlm_imgs = [str(rd / n) for n in shots if (rd / n).exists()]
    vlm_judge = 0.0
    if vlm_score_rubric and vlm_imgs:
        rubric = {
            "vlm_mgmt_ui_real":
                "至少一张截图清晰显示 RabbitMQ Management UI 主窗口（顶部 Overview/Connections/Channels/Exchanges/Queues 导航栏 + Queued messages / Message rates 图）",
            "vlm_rates_tooltip":
                "view_02 显示 Message rates 折线图上有 hover tooltip 浮窗，且 publish 与 deliver 的数字可读",
            "vlm_bindings_panel":
                "view_04 显示某队列详情页的 Bindings 子面板，包含 source exchange + routing key 列",
            "vlm_after_fix_chart":
                "view_06 / view_07 显示修复后 publish 与 deliver 收敛 或 DLQ messages 计数 ≥ 20",
        }
        vlm = vlm_score_rubric(vlm_imgs[:7], rubric,
            instruction="评估 SRE 用 RabbitMQ Management UI 排查 DLQ 路由黑洞的截图。")
        for k in rubric: s[k] = vlm.get(k, 0.0)
        s["judge_method"] = vlm.get("judge_method", "failed")
        vlm_judge = sum(s.get(k, 0.0) for k in rubric) / max(1, len(rubric))
    else:
        for k in ("vlm_mgmt_ui_real", "vlm_rates_tooltip",
                  "vlm_bindings_panel", "vlm_after_fix_chart"):
            s[k] = 0.5
        vlm_judge = 0.5

    # Aggregate
    nums = [v for k, v in s.items()
            if isinstance(v, (int, float)) and k != "judge_method"]
    base = sum(nums) / max(1, len(nums))

    # Hard gates
    has_struct = (s["bindings_broken_visible"] >= 0.5
                  and s["queue_args_expected_rk"] >= 0.4
                  and s["bindings_after_ok"] >= 0.4)
    has_visual = s["gui_screenshots_count"] >= 0.5
    if not has_struct: base = min(base, 0.4)
    if not has_visual: base = min(base, 0.4)
    # Only apply the VLM cap when the VLM judge actually ran. When the
    # helper is unavailable (vlm_score_rubric is None), the 0.5 fallback
    # would otherwise penalise a perfect run for an environment defect.
    if vlm_score_rubric is not None and vlm_judge < 0.6:
        base = min(base, 0.55)
    if s["dlq_growth_after_fix"] < 1.0 or s.get("vlm_after_fix_chart", 0) < 0.5:
        base = min(base, 0.55)
    if s["rate_gap_observed"] < 0.6 or s["cross_channel_switches"] < 1.0:
        base = min(base, 0.6)
    s["overall_score"] = round(base, 3)
    return s
```

## Workspace Path

```
workspace/OPS/task_17_rabbitmq_dlq_topology_mgmt
```

## Skills

```
```

## Env

```
```

## Warmup

```bash
set +e
export DEBIAN_FRONTEND=noninteractive
umask 0000
mkdir -p /tmp_workspace/results /tmp_workspace/state /opt/ops17_gt
chmod 0777 /tmp_workspace /tmp_workspace/results /tmp_workspace/state 2>/dev/null || true
which rabbitmqctl >/dev/null 2>&1 || timeout 120 apt-get -o Acquire::Retries=10 update -qq || true
which rabbitmqctl >/dev/null 2>&1 || timeout 600 apt-get -o Acquire::Retries=10 install -y -qq rabbitmq-server python3-pika curl procps psmisc tesseract-ocr || true
python3 -c 'import PIL, pytesseract' >/dev/null 2>&1 || timeout 120 pip install --quiet --no-input pillow pytesseract 2>/dev/null || true
# Framework mounts workspace/exec/* directly under /tmp_workspace/ (NOT /tmp_workspace/exec/).
chmod +x /tmp_workspace/start_services.sh 2>/dev/null || true
nohup bash /tmp_workspace/start_services.sh >/tmp_workspace/state/start_services.out 2>&1 &
disown || true
for i in $(seq 1 30); do curl -fsS --max-time 2 -u guest:guest http://127.0.0.1:15672/api/overview >/dev/null 2>&1 && break; sleep 2; done
[ -x /usr/local/bin/rabbitmqadmin ] || (timeout 30 curl -fsS -o /usr/local/bin/rabbitmqadmin http://127.0.0.1:15672/cli/rabbitmqadmin 2>/dev/null && chmod +x /usr/local/bin/rabbitmqadmin) || true
[ -x /usr/local/bin/rabbitmqadmin ] || (timeout 60 curl -fsSL -o /usr/local/bin/rabbitmqadmin https://raw.githubusercontent.com/rabbitmq/rabbitmq-server/v3.12.0/deps/rabbitmq_management/bin/rabbitmqadmin 2>/dev/null && chmod +x /usr/local/bin/rabbitmqadmin) || true
chmod -R a+rwX /tmp_workspace/state /tmp_workspace/results 2>/dev/null || true
# Move expected.json (contains expected_dead_letter_routing_key /
# fix_acceptable_remediations / postmortem keywords) to root-only /opt/ops17_gt.
if [ -f /tmp_workspace/gt/expected.json ]; then
  mv /tmp_workspace/gt/expected.json /opt/ops17_gt/expected.json 2>/dev/null || true
  chown -R root:root /opt/ops17_gt 2>/dev/null || true
  chmod 700 /opt/ops17_gt 2>/dev/null || true
  chmod 600 /opt/ops17_gt/expected.json 2>/dev/null || true
  rmdir /tmp_workspace/gt 2>/dev/null || true
fi
echo "[warmup] OPS_task_17 services bootstrap kicked"
```