📋 Review Summary

This PR addresses two important issues in the LogToSpanProcessor bridge: improving error message quality when OTLP exports fail, and preventing TUI pollution by routing diagnostics through an injectable sink. The implementation is well-designed with excellent test coverage (42 new test cases), maintains backward compatibility, and demonstrates thoughtful API design.

🔍 General Feedback

• Strong test coverage: 42 new test cases comprehensively cover edge cases including HTTP/2 empty messages, JSON escaping, data truncation, networking error codes, and sink injection behavior
• Good backward compatibility: The 3-arg numeric constructor is preserved, and diagnosticsSink is only available on the options-object overload
• Thoughtful API design: The injectable sink pattern is well-executed, with a sensible default that preserves existing behavior for non-interactive runs
• Excellent documentation: Code comments clearly explain tradeoffs (e.g., why sink errors are swallowed, why non-numeric codes aren't labeled as HTTP codes)
• Security-conscious: JSON-escaping prevents log line tearing and potential log injection attacks

🎯 Specific Feedback

🟡 High

• File: log-to-span-processor.ts:273-279 - The emitDiagnostic method swallows all sink errors to prevent interrupting telemetry ingestion. While the comment explains the tradeoff, consider adding a fallback mechanism (e.g., after N consecutive sink failures, fall back to stderr with a rate limit). Currently, a misbehaving sink could silently lose all diagnostics indefinitely.

• File: sdk.ts:274-277 - The conditional injection of diagnosticsSink only happens when config.isInteractive() is true. However, there's no test verifying that non-interactive mode with isInteractive() === false actually uses the default stderr sink (the test only checks that diagnosticsSink is undefined). Consider adding a test that verifies stderr output in non-interactive mode when an export fails.

🟢 Medium

• File: log-to-span-processor.ts:460 - The formatExportError function truncates response data to 200 bytes, which is reasonable. However, consider making this configurable via LogToSpanProcessorOptions for environments where longer error payloads are valuable (e.g., debugging complex API errors). The constant could be maxErrorDataBytes?: number with a default of 200.

• File: log-to-span-processor.ts:454 - The comment mentions "shell-active bytes" but the actual concern is log parsing/grep corruption, not shell activity. Consider rewording to "log parsing-active characters" or simply "characters that could break log parsing."

• File: log-to-span-processor.test.ts:858-860 - The test for JSON-escaping verifies the message doesn't contain newlines and contains escaped sequences. Consider also asserting that the entire diagnostic message is a single line by checking msg.split('\n').length === 1 to make the intent more explicit.

🔵 Low

• File: log-to-span-processor.ts:58-69 - The class JSDoc mentions "backends (e.g., Alibaba Cloud) that support traces and metrics but not logs." Consider updating this to also mention the TUI pollution fix, as that's now a significant part of the processor's responsibility.

• File: sdk.ts:270-276 - The inline comment explaining the sink injection is good, but consider extracting this logic to a small helper function like createLogToSpanDiagnosticsSink(config: Config) to improve readability and make it easier to test independently.

• File: log-to-span-processor.ts:47-54 - The LogToSpanDiagnosticsSink type JSDoc says "Messages have no trailing newline," but the default sink adds \n. This is technically correct (the sink receives the message without newline), but could be clearer. Consider: "Messages are passed without a trailing newline — the sink implementation decides how to terminate them."

• File: log-to-span-processor.test.ts:966-968 - The test "routes buffer-overflow warnings through the injected sink" uses expect.stringContaining without verifying the exact format. Consider matching the full expected format like other tests do for consistency.

✅ Highlights

• Excellent error handling: The formatExportError function handles numerous edge cases (empty messages, HTTP/2, networking errors, missing error objects) with appropriate fallbacks
• Smart data truncation: Limiting response data to 200 bytes prevents log flooding while preserving enough context for debugging
• Proper type safety: The LogToSpanDiagnosticsSink type is exported but not re-exported from public indexes, correctly marking it as internal API
• Comprehensive test scenarios: Tests cover sink-throw recovery, ensuring the processor continues working even when the sink fails
• Clean separation of concerns: The diagnostic routing logic is cleanly separated from the export logic, making the code easier to maintain and test

Triaged the automated review summary against b7aa282:

🟡 High — sink-failure fallback to stderr: Push back. The whole point of the diagnosticsSink injection is to keep bridge diagnostics out of the rendered terminal area; reintroducing a stderr fallback would re-create the exact TUI-pollution problem this PR is fixing. The existing isDebugLoggingDegraded() flag is the host's signal for "overall logging is broken" — surfacing per-subsystem loss-of-signal each time the sink fails would just churn. Keeping the swallow as documented.

🟡 High — verify non-interactive mode actually emits to stderr: Valid, fixed. The previous test only asserted diagnosticsSink === undefined. Now strengthened to construct a real LogToSpanProcessor with the default sink and verify a failed export writes [LogToSpan] export failed: code=1 error="boom"\n to stderr end-to-end.

🟢 Medium — configurable maxErrorDataBytes: Push back, YAGNI. Single user (the bridge) and a single failure mode (ARMS-style empty-reason-phrase non-2xx). Adding a knob with no current caller is premature. Trivial to add later if a real second use case shows up.

🟢 Medium — "shell-active bytes" wording: Fixed. Reworded to "characters that would break log parsing" — the concern is log-line tearing for greps and the file-logger format, not shell semantics.

🟢 Medium — explicit split('\n').length === 1: Skipping. The existing not.toContain('\n') assertion already enforces the single-line invariant and is the more direct expression of intent.

🔵 Low — class JSDoc mentions TUI fix: Fixed. Added a paragraph pointing at the diagnosticsSink option and its TUI-pollution rationale.

🔵 Low — extract createLogToSpanDiagnosticsSink helper: Push back. The sink wiring is 3 lines of spread + arrow function and lives once at the only construction site. Extracting it would add an indirection without any reuse or testability gain — the unit test already exercises both branches directly.

🔵 Low — sink type JSDoc wording: Fixed. Reworded to "Messages are passed without a trailing newline — the sink implementation decides how to terminate them" for clarity.

🔵 Low — buffer-overflow full-format assertion: Skipping. That test verifies a specific signal (the warning prefix). Pinning to the full format would just churn on every wording tweak without catching anything the prefix doesn't.

🤖 Generated with Qwen Code

Qwen Code Review (STANDARD)

What this PR does (2–3 sentences synthesized from the diff and PR title/body):
Improves the LogToSpanProcessor bridge diagnostics by surfacing actionable error info (name, httpCode, data snippet) when OTLP exports fail — replacing empty error= messages caused by HTTP/2 stripped reason-phrases. Additionally introduces an injectable diagnosticsSink so TUI (interactive) mode routes bridge diagnostics through the file-backed debugLogger instead of raw process.stderr, which was polluting the Ink render area.

🟡 P2 — Medium

1. packages/core/src/telemetry/log-to-span-processor.ts:81 (commit 2) — TSDoc { @link LogToSpanDiagnosticsSink} has a space after {. TSDoc requires {@link ...} (no space) to resolve the cross-reference. The rendered docs will show the literal text { @link LogToSpanDiagnosticsSink} instead of a hyperlink.

   - * routed through { @link LogToSpanDiagnosticsSink} so TUI hosts can keep
   + * routed through {@link LogToSpanDiagnosticsSink} so TUI hosts can keep

2. packages/core/src/telemetry/sdk.ts:274 — The injected sink (message) => debugLogger.warn(message) silently drops diagnostics when no debug log session is active (getActiveSession() returns null). In interactive mode this can happen during early startup (before setDebugLogSession / runWithDebugLogSession is established) or if session setup fails. The author has explicitly accepted this tradeoff (per PR comment and emitDiagnostic JSDoc), and isDebugLoggingDegraded() is the host-level signal. Noting for awareness — no action required this PR, but consider whether a startup-window diagnostic loss is acceptable long-term or merits a follow-up.

🟢 P3 — Low

1. packages/core/src/telemetry/log-to-span-processor.ts:456 — The formatExportError comment says "The 200 figure is JS string length (UTF-16 code units), not bytes" — accurate and well-documented. Consider whether a constant like MAX_ERROR_DATA_CHARS = 200 at module scope would make the intent self-documenting at the call site (extra.data.slice(0, MAX_ERROR_DATA_CHARS)) and easier to adjust if a second caller appears. Low priority; the current inline literal is acceptable for a single-use value.

Cross-file notes

• Config.isInteractive() is set in the constructor (this.interactive = params.interactive ?? false at config.ts:1041), so it is reliably resolved at initializeTelemetry call time. No race concern.
• LogToSpanDiagnosticsSink is export-ed from the module file but not re-exported from any barrel (telemetry/index.ts). Consistent with how LogToSpanProcessor itself is scoped — internal API, no public surface change.
• The LogToSpanProcessor mock assertions in sdk.test.ts were correctly relaxed from exact-match to expect.objectContaining(...) to tolerate the new optional diagnosticsSink field.

✅ Highlights

• Exceptionally thorough test coverage: all four diagnostic emission sites (export-failed, export-threw, export-timeout, buffer-overflow) are tested through both the default stderr sink and an injected sink, plus sink-throw recovery, non-Error throws, newline escaping, and data truncation.
• The formatExportError function is well-designed — typeof guards on code and data correctly handle the polymorphic OTLPExporterError shape (numeric HTTP codes vs. string networking codes like ECONNREFUSED).
• Backward compatibility is carefully preserved: the legacy numeric-arg constructor path gets defaultDiagnosticsSink unconditionally.
• The second commit demonstrates good review-follow-through: addressing CI failures, dead code removal, and test strengthening based on reviewer feedback.

Validation Evidence

PRESENT — The PR body includes:

• Unit test commands and pass counts (vitest run for both test files: 42 + 38 cases).
• Before/after diagnostic output examples (ARMS Singapore endpoint: [LogToSpan] export failed: code=1 error= → [LogToSpan] export failed: code=1 error="OTLPExporterError" httpCode=403 data="...").
• Lint confirmation (eslint clean on all 4 touched files).
• Manual verification note referencing the specific reproduction scenario.

This is an automated, advisory, comment-only review — it never approves or requests changes.

Qwen Code /review · qwen3.7-max · tier STANDARD

Triage of the automated review:

🟡 P2 #1 (TSDoc { @link ...} typo): False positive. The file at HEAD (b7aa2823e) reads {@link LogToSpanDiagnosticsSink} with no space — verified via git show HEAD:packages/core/src/telemetry/log-to-span-processor.ts | sed -n '82p'. No change needed.

🟡 P2 #2 (sink drops diagnostics if no debug session): Acknowledged trade-off — `setDebugLogSession` is called in the `Config` constructor (`config.ts:958`) before `initializeTelemetry` (`config.ts:1136`), so in normal startup the session is established before the bridge constructs. The startup-window concern only materializes if telemetry init somehow precedes Config construction, which the current call graph forbids. Documented in `emitDiagnostic` JSDoc with the `isDebugLoggingDegraded()` fallback rationale; no follow-up planned.

🟢 P3 #1 (extract MAX_ERROR_DATA_CHARS = 200 constant): Push back — single-use literal at the only call site, with a comment explaining the choice. Extracting now would just add a constant nobody else consumes. Will revisit if a second caller appears.

No code change this round.

🤖 Generated with Qwen Code

Qwen Code Review (DEEP)

CI-safe profile adapted from bundled /review; focused passes: correctness/security, test coverage, maintainability/performance, and undirected audit.

Correctness / Security

No correctness or security issues found.

The PR is well-implemented:

• Error formatting (formatExportError): Fallback chain message → name → 'unknown' correctly handles HTTP/2 empty reason-phrases. typeof extra.code === 'number' guard avoids mislabelling ECONNREFUSED as HTTP status. JSON.stringify on message and data enforces the single-line invariant for downstream log parsers.
• Diagnostics sink: emitDiagnostic swallows sink errors via try-catch, preventing a misbehaving sink from disrupting telemetry ingestion. The tradeoff (silent diagnostic loss when sink fails) is documented and acceptable — the host surfaces overall logging health via isDebugLoggingDegraded().
• Backward compatibility: Legacy numeric-arg constructor preserves stderr behavior. Options-object overload cleanly adds diagnosticsSink with ?? defaultDiagnosticsSink fallback.
• sdk.ts wiring: Conditional spread ...(config.isInteractive() && { diagnosticsSink: ... }) correctly injects the sink only in TUI mode, leaving the default stderr sink for CI/scripts.
• Test coverage: Comprehensive — covers empty messages, embedded newlines, non-Error throws, ECONNREFUSED string codes, missing errors, data truncation, sink throw recovery, buffer overflow routing, timeout routing, and end-to-end stderr verification for non-interactive mode.

Needs Verification

No concerns requiring additional verification.

Validation Evidence

PRESENT — PR body includes: unit test commands (vitest run for both test files with case counts: 42 + 38), lint confirmation (eslint clean on all 4 files), and manual verification against ARMS Singapore endpoint showing diagnostic reaching ~/.qwen/logs/<session>.log instead of the TUI render area. Author PR comments include detailed triage of prior automated review findings with push-back rationale.

This is an automated, advisory, comment-only review — it never approves or requests changes.

Test Coverage

• P3 log-to-span-processor.ts — formatExportError err.message || err.name || 'unknown' chain — The fallback chain has three levels, but only two are tested: err.message non-empty (tests 1, 2, 4) and err === undefined (test 5, short-circuits at !err). The third branch — both err.message and err.name falsy, landing on 'unknown' — is unreachable by any existing test. A concrete scenario: Object.assign(new Error(''), { name: '' }) (some minified environments strip Error names). Suggested test:

  it('falls back to "unknown" when both message and name are empty', async () => {
    const err = Object.assign(new Error(''), { name: '' });
    // ... construct failing processor, assert output contains error="unknown"
  });

• P3 log-to-span-processor.ts — formatExportError err.data === '' branch — The guard typeof extra.data === 'string' && extra.data.length > 0 has a deliberate empty-string exclusion (empty HTTP response body → skip data= field). Existing tests cover data populated (3 tests) and data absent (undefined, test 4), but not data present as an empty string. A future refactor loosening length > 0 to !== undefined would emit a meaningless data="" without any test catching it. Suggested assertion:

  it('omits data field when err.data is an empty string', async () => {
    const err = Object.assign(new Error('fail'), { code: 500, data: '' });
    // ... assert output does NOT contain 'data='
  });

Needs Verification

No cross-file concerns — the changed symbols (formatExportError, emitDiagnostic, diagnosticsSink, LogToSpanDiagnosticsSink) are module-private or have no external callers beyond the two files in the diff.

Validation Evidence

PRESENT — The PR body includes: unit test transcripts (vitest run — 42 + 38 cases), eslint-clean confirmation on all 4 files, and a manual verification report (ARMS Singapore endpoint failure → diagnostic routed to ~/.qwen/logs/<session>.log instead of TUI render area). The author's triage comments on prior automated review rounds demonstrate iterative hardening (sink-failure swallow rationale, non-interactive end-to-end stderr check, JSON-escape on export-threw path).

This is an automated, advisory, comment-only review — it never approves or requests changes.

Maintainability / Performance

No maintainability or performance issues found.

Code-quality highlights (verified against diff + surrounding code):

• emitDiagnostic cleanly centralizes the try/catch swallow at one site; all four diagnostic emission points (buffer overflow, timeout, export-failed, export-threw) route through it. The default sink is hoisted to module scope (defaultDiagnosticsSink) so it isn't recreated per construction.
• formatExportError is a focused pure function. The typeof extra.code === 'number' guard correctly distinguishes HTTP statuses from Node system error strings (ECONNREFUSED); JSON.stringify on both msg and data enforces the single-line invariant; data.slice(0, 200) runs before stringify so the cap is a real noise budget. Patch 2's "characters not bytes" comment correction is accurate (JS .length is UTF-16 code units).
• Backward compatibility: the three constructor overloads are preserved. The legacy numeric-arg path keeps stderr via the default sink; the options-object overload gains the new optional field. Only one production construction site exists (sdk.ts:221) — cross-file impact is nil.
• sdk.ts wiring uses ...(config.isInteractive() && { diagnosticsSink: ... }) — evaluates once at init, captures the already-in-scope debugLogger from line 155, no extra allocation in the hot path.
• Test additions are thorough: 11 new cases covering all four diagnostic sites, sink-throw recovery (verifying resolve() still runs and subsequent exports proceed), format edge cases (empty message, embedded newlines, non-Error throws, ECONNREFUSED), and — after patch 2 — a real-processor end-to-end check for the default stderr sink.

Performance highlights:

• All changes are on error/failure paths (export failures, buffer overflow, timeout). No hot-path impact.
• JSON.stringify on a 200-character slice and on short error messages is negligible.
• No new retained memory: the sink closure captures the module-scoped debugLogger, which is already long-lived.
• diagnosticsSink is never buffered — emitted synchronously at the failure site.

Needs Verification

• None. The only production caller of LogToSpanProcessor is in sdk.ts:221 (verified via grep), so no cross-file signature incompatibility is possible. The Config.isInteractive() method used in sdk.ts is already exercised by the new sdk.test.ts cases (isInteractive: () => false added to two existing mock configs and both interactive/non-interactive paths asserted).

Validation Evidence

PRESENT — PR body cites unit results (vitest run on both touched test files: 42 + 38 cases), eslint clean on all 4 files, and manual ARMS Singapore endpoint verification showing the diagnostic landing in ~/.qwen/logs/<session>.log instead of the TUI render area. Author's triage comments document explicit push-back on three advisory findings with reasoned rationale (TUI-pollution regression risk, YAGNI on maxErrorDataBytes, single-site helper extraction).

This is an automated, advisory, comment-only review — it never approves or requests changes.

Undirected Audit

No additional undirected-audit issues found.

I reviewed the diff through attacker, 3 AM oncall, and six-months-later maintainer personas, cross-referencing the production code paths in the working tree. The changes are tight and well-reasoned:

• Attacker: formatExportError applies JSON.stringify to all user-controlled fields (err.message, err.data) before emission, preventing log-line tearing via embedded newlines. The typeof extra.code === 'number' guard prevents labelling system errors (ECONNREFUSED) as HTTP codes. The data.slice(0, 200) cap prevents unbounded memory/stringify cost from a malicious backend returning a huge response body. Terminal escape sequences in err.data are not sanitized, but the old code passed err.message raw — this is pre-existing and not a regression.

• 3 AM oncall: The new diagnostic format (error="OTLPExporterError" httpCode=403 data="Forbidden: invalid license") is a dramatic improvement over the old error= for empty-reason-phrase failures — exactly what an oncall engineer needs. The emitDiagnostic try/catch ensures a broken sink never takes down telemetry ingestion, and the documented isDebugLoggingDegraded() fallback gives operators a signal when the file logger is broken.

• Future maintainer: The diagnosticsSink injection is cleanly scoped — one exported type (LogToSpanDiagnosticsSink), one optional field on the options overload, one private method (emitDiagnostic). The defaultDiagnosticsSink is hoisted to module scope (no per-call allocation). The legacy numeric-arg constructor overload preserves stderr behavior for existing callers. Only one production construction site exists (sdk.ts:~267), and the ...(config.isInteractive() && { diagnosticsSink: ... }) pattern is idiomatic. The setDebugLogSession(this) call at config.ts:926 precedes initializeTelemetry(this) at config.ts:1101, so the file sink always has a valid session in normal startup — the author's claim checks out.

Needs Verification

No concerns that require code outside the supplied context. All production call sites (LogToSpanProcessor construction in sdk.ts, debugLogger.warn in debugLogger.ts, setDebugLogSession/initializeTelemetry ordering in config.ts) were verified in the working tree.

Qwen Code /review · qwen3.7-max · tier DEEP

Triage of the DEEP-tier review (correctness/security, test coverage, maintainability/performance, undirected audit):

Correctness / Maintainability / Undirected: no findings, all positive.

Test Coverage (2 × P3): both real branches that weren't covered. Repro confirmed each is reachable, and the bot's "future-refactor regression" concern on the data length guard is valid. Added in 65e0919:

• 'unknown' fallback when both err.message and err.name are empty (minified Error scenario)
• data field omitted when err.data === '' (guards against loosening the length > 0 predicate to !== undefined)

Tests now 46/46 green.

🤖 Generated with Qwen Code

本地真实测试报告（merge 参考）

按 PR body 的 Test plan 完成了静态检查 + 单元测试 + 真实 tmux 端到端验证。LogToSpan bridge 的诊断输出确实被正确路由到 debug 日志文件、TUI 渲染区彻底干净，新的 error="..." httpCode=N data="..." 格式按预期工作。可以合并。

测试环境

1. 构建与静态检查

npm install         → 1373 packages（首次安装）
npm run build       → 成功（85s 主链路 + vscode-ide-companion）
npx tsc --noEmit -p packages/core   → CORE_EXIT=0
npx tsc --noEmit -p packages/cli    → CLI_EXIT=0
npx eslint packages/core/src/telemetry/{log-to-span-processor,sdk}.{ts,test.ts}
                    → ESLINT_EXIT=0（4 个文件全部 clean）

2. 单元测试

npx vitest run packages/core/src/telemetry/log-to-span-processor.test.ts \
                packages/core/src/telemetry/sdk.test.ts

实际数量 > PR body 声明，因为后续两次 review-driven commit 又补了 25 个 case：test(telemetry): cover two unreachable formatExportError branches 和 fix(telemetry): tighten LogToSpan diagnostics per wenshao review。全部通过。

3. 真实 CLI 端到端（tmux + 假 OTLP 服务器）

这是 PR body Test plan 里 "Manual verification" 的可重复版本——验证两件事：

1. error="..." httpCode=N data="..." 新格式确实出现在 debug 日志文件中
2. TUI 渲染区彻底无 [LogToSpan] export failed: ... 泄漏

步骤

1. 启动假 OTLP 服务器（监听 127.0.0.1:14318，对所有请求返回 HTTP 403 + 一段 plain-text body）
2. 配置环境——关键点：必须把 QWEN_TELEMETRY_OTLP_ENDPOINT 设为空字符串才能让 bridge 触发（否则 getTelemetryOtlpEndpoint() 默认返回 http://localhost:4317，使 logsUrl 解析为非空 URL，bridge 不会启用）：

export QWEN_TELEMETRY_ENABLED=true
export QWEN_TELEMETRY_OTLP_PROTOCOL=http
export QWEN_TELEMETRY_OTLP_ENDPOINT=""           # ← 空串，让 logsUrl=undefined
export QWEN_TELEMETRY_OTLP_TRACES_ENDPOINT=http://127.0.0.1:14318/v1/traces
unset QWEN_TELEMETRY_TARGET                      # 注意：valid 值仅 local/gcp，不需要设
tmux new-session -d -s pr4482 -x 220 -y 50
tmux send-keys -t pr4482 'npm run dev' Enter

3. 确认 bridge 已启用——debug 日志第 3 行：

[DEBUG] [OTEL] OTLP HTTP endpoints: traces=http://127.0.0.1:14318/v1/traces, logs=none, metrics=none

logs=none 即触发 LogToSpanProcessor 分支。

4. 发送 prompt 触发 log records：

> 一句话告诉我什么是Raft协议。

5. 5 秒后 bridge 周期性 flush，OTLP 导出收到 403 → 走入新加的 formatExportError 路径。

假服务器收到的请求

[fake-otlp] 17:11:32 POST /v1/traces (#2)
[fake-otlp] 17:11:32 POST /v1/traces (#3)
[fake-otlp] 17:11:47 POST /v1/traces (#4)
[fake-otlp] 17:11:50 POST /v1/traces (#5)
[fake-otlp] 17:11:52 POST /v1/traces (#6)
... (合计 11 次 POST 跨两轮测试)

Debug 日志文件中的 bridge 诊断（关键证据）

~/.qwen/debug/<sessionId>.txt 第 113 行起：

2026-05-25T17:11:32.496Z [WARN] [OTEL] [trace_id=db4eccc3... span_id=9c66e6c4...] [LogToSpan] export failed: code=1 error="Forbidden" httpCode=403 data="Forbidden: invalid license token (PR 4482 manual test)"
2026-05-25T17:11:47.489Z [WARN] [OTEL] [LogToSpan] export failed: code=1 error="Forbidden" httpCode=403 data="Forbidden: invalid license token (PR 4482 manual test)"
2026-05-25T17:11:52.492Z [WARN] [OTEL] [LogToSpan] export failed: code=1 error="Forbidden" httpCode=403 data="Forbidden: invalid license token (PR 4482 manual test)"
2026-05-25T17:11:57.497Z [WARN] [OTEL] [LogToSpan] export failed: code=1 error="Forbidden" httpCode=403 data="Forbidden: invalid license token (PR 4482 manual test)"

逐项核对：

• ✅ [WARN] 级别（即 debugLogger.warn 注入路径，非 stderr）
• ✅ error="Forbidden"——从 OTLPExporterError 取 message/name，JSON-escape 后写入
• ✅ httpCode=403——只在 typeof err.code === 'number' 时打印（这正是 PR body 强调的"load-bearing typeof guard，不能放宽到 truthy"的分支）
• ✅ data="Forbidden: invalid license token (PR 4482 manual test)"——取响应体前 200 字符，JSON-escape

TUI 渲染区扫描（反向证据）

$ tmux capture-pane -t pr4482 -p -S -2000 | grep -E "LogToSpan|export failed"
(no output)

整个 2000 行 scrollback 内零 LogToSpan / export failed 字符串。模型回答正常渲染，无任何换行或符号被破坏。这就是 PR 修复的核心目标——bridge 诊断不再越过 Ink 渲染区域写到原生 stderr。

覆盖矩阵：PR claim → 验证

4. 一点配置可用性提醒（非阻塞）

我在搭建复现时踩过两个坑，文档/帮助里似乎没明说，记下来供其他 reviewer 或后续用户参考：

1. QWEN_TELEMETRY_TARGET 的合法值只有 local / gcp——不能写 otlp。OTLP 路径是通过设置 QWEN_TELEMETRY_OTLP_* 系列环境变量自动启用的。
2. 想触发 LogToSpan bridge 必须让 getTelemetryOtlpEndpoint() 返回空串。该 getter 实现是 this.telemetrySettings.otlpEndpoint ?? DEFAULT_OTLP_ENDPOINT，所以只设 QWEN_TELEMETRY_OTLP_TRACES_ENDPOINT 而不显式 export QWEN_TELEMETRY_OTLP_ENDPOINT="" 时，logsUrl 会被解析成 http://localhost:4317/v1/logs，bridge 不会启用。这是 OTLP 配置的现有行为，与本 PR 无关，但对验证本 PR 的 manual 测试很关键——值得在 docs 里补一句。

5. 结论

• ✅ 静态检查（build / tsc / eslint）全绿
• ✅ 105/105 单测通过（log-to-span-processor 48 + sdk 57，超 PR body 声称的 80 个）
• ✅ 真实 CLI 在 OTLP 后端 403 时，bridge 诊断按新格式 error="..." httpCode=403 data="..." 落入 debug 日志文件
• ✅ TUI 渲染区彻底无 [LogToSpan] 泄漏（2000 行 scrollback 零匹配）

从本地真实测试角度，该 PR 可以合并。 ARMS Singapore 那种 "traces+metrics 通但 logs 不通" 的真实失败场景下，运维拿到的诊断从原来的 code=1 error=（空）变成了 code=1 error="..." httpCode=N data="..."，且不再污染 TUI——这是 PR body 承诺的两件事，本地实测都成立。

感谢这么细的端到端验证 🙏

特别想 highlight 几条：

• TUI scrollback 0 匹配——tmux capture-pane -S -2000 | grep "LogToSpan|export failed" 出空集，是本 PR 的核心目标得到独立证实
• httpCode=403 这条——刚好命中"load-bearing typeof guard"的活路径，这是上一轮 review 里你和 DEEP-tier bot 各自从不同角度都标过的点，看到实跑里它如愿打印出 numeric 而非误标 ECONNREFUSED，挺安心的
• 新格式 error="..." httpCode=N data="..." 在真实 ARMS-403-with-body 场景下完整落进文件日志——这就是 PR 头图截到的 code=1 error=（空）问题的实际治疗效果

第 4 节那两条 OTLP 配置可用性提示（QWEN_TELEMETRY_TARGET 的合法 enum、需要显式 OTLP_ENDPOINT="" 才能触发 bridge），同意你的判断——属于 OTLP 配置文档的现有 quirk，不在本 PR scope。但确实值得补到 docs，让我开个 follow-up issue 跟，或者你直接 ping 一个 owner 也行。

PR side 不再有改动，等 OWNER/MEMBER 一票就能合。再次感谢。

🤖 Generated with Qwen Code