diff --git a/.hermes/shared-memory/decision-log.md b/.hermes/shared-memory/decision-log.md
index bb78521f..1b2e161b 100644
--- a/.hermes/shared-memory/decision-log.md
+++ b/.hermes/shared-memory/decision-log.md
@@ -16,6 +16,14 @@
 
 ---
 
+## 2026-06-05 OSS 平台适配器输出结构化日志
+
+- 背景：AI 生成资产、浏览器直传签名、私有读签名和对象确认都依赖 OSS；如果 OSS 侧只有错误字符串，排查资产写入 / 确认失败时很难按操作、对象、状态码和耗时下钻。
+- 决策：`server-rs/crates/platform-oss` 统一为 `sign_post_object`、`sign_get_object_url`、`head_object` 和 `put_object` 输出结构化日志。日志固定携带 `provider=aliyun-oss`、`operation`、`bucket`、`endpoint`、`object_key` / `key_prefix`、`access`、`content_type`、`content_length`、`status`、`status_class`、`error_kind` 和 `elapsed_ms` 等排障字段；禁止输出 AccessKey、policy、signature、Authorization header 或完整 signed URL。
+- 影响范围：`server-rs/crates/platform-oss`、`api-server` 资产签名 / 上传 / 确认链路、OTLP logs、本地 `logs/api-server/` 与运维排障文档。
+- 验证方式：`cargo test -p platform-oss --manifest-path server-rs/Cargo.toml`；真实联调时按 `provider=aliyun-oss` 与 `operation` 过滤日志，确认只出现对象定位和状态字段，不出现签名材料。
+- 关联文档：`server-rs/crates/platform-oss/README.md`、`docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md`、`docs/【开发运维】本地开发验证与生产运维-2026-05-15.md`。
+
 ## 2026-06-03 创作入口关闭不下架已发布作品
 
 - 背景：`creation_entry_disabled` 曾由 api-server 按 runtime 路由前缀统一熔断，导致用户进入平台首页或启动已发布作品时也可能看到“创作入口已关闭”错误。
diff --git a/docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md b/docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md
index 053fe85c..3fbda7e4 100644
--- a/docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md
+++ b/docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md
@@ -128,9 +128,10 @@ npm run check:server-rs-ddd
 3. Adapter 输出应保留 legacy public path、object key、asset object id、MIME、extension、task id 和实际 prompt。
 4. Adapter 不负责扣费、退款或钱包读取；计费仍由调用方显式包裹。
 5. 图片 provider 协议不再放在玩法模块里实现。VectorEngine `gpt-image-2` 创建 / 编辑协议、URL / base64 图片解析、远端图片下载、请求超时 / 上游状态 / 响应解析 / 缺图 / 下载失败的结构化日志统一在 `server-rs/crates/platform-image/src/vector_engine/`；其中 `client.rs` 只保留 provider 调用编排，`transport.rs` 负责 HTTP client 与 reqwest 错误归一，`request.rs` 负责请求体和路径，`payload.rs` 负责响应 JSON 字段提取，`response.rs` 负责响应状态分流和图片结果归一。`api-server` 只负责配置校验、玩法 prompt 编排、OSS / asset object / binding 持久化、计费和外部 API 失败审计落库。
-6. Puzzle、Match3D、音频、GLB、视频等复杂媒体可以复用 OSS + asset object + binding 的底层持久化能力，但玩法专属处理规则留在各自编排层，不塞进公共接口。
-7. 拼图入口页与结果页新增关卡的本地参考图不走浏览器直传 OSS，前端读取为 Data URL 后随创作 action 提交，并在读取前限制 6MB、显示“图片≤6MB”。`api-server` 必须对 Data URL 实际字节数再次校验；历史图片才提交 `referenceImageAssetObjectId(s)`，后端校验 `asset_object` 的 bucket、kind、图片 MIME、大小和 owner 后签发只读 URL 给 VectorEngine 读取。
-8. 系列素材图集实现真相源在 `server-rs/crates/platform-image/src/generated_asset_sheets/`：调用方必须传入 `grid_size` 作为 `n*n` 的 `n`，可选传入物品名称 prompt 模板和特殊设定 prompt；模块负责 sheet prompt 组装、按 `n*n` 切片、透明化、PNG 输出、OSS private upload 请求构造和 sheet / item / special prompt 元数据持久化。`server-rs/crates/api-server/src/generated_asset_sheets.rs` 只保留 `AppState` / `AppError` 适配和兼容导出。玩法只负责规划 slot、调用具体生图 provider、计费、失败回写，以及把通用切片结果映射回自己的 DTO / 草稿 / runtime 字段。
+6. OSS 平台适配日志统一在 `server-rs/crates/platform-oss` 输出，覆盖 `sign_post_object`、`sign_get_object_url`、`head_object` 和 `put_object`。日志字段固定使用 `provider`、`operation`、`bucket`、`endpoint`、`object_key` / `key_prefix`、`access`、`content_type`、`content_length`、`status`、`status_class`、`error_kind` 和 `elapsed_ms`，只记录对象定位和排障信息；不得输出 AccessKey、policy、signature、Authorization header 或完整 signed URL。
+7. Puzzle、Match3D、音频、GLB、视频等复杂媒体可以复用 OSS + asset object + binding 的底层持久化能力，但玩法专属处理规则留在各自编排层，不塞进公共接口。
+8. 拼图入口页与结果页新增关卡的本地参考图不走浏览器直传 OSS，前端读取为 Data URL 后随创作 action 提交，并在读取前限制 6MB、显示“图片≤6MB”。`api-server` 必须对 Data URL 实际字节数再次校验；历史图片才提交 `referenceImageAssetObjectId(s)`，后端校验 `asset_object` 的 bucket、kind、图片 MIME、大小和 owner 后签发只读 URL 给 VectorEngine 读取。
+9. 系列素材图集实现真相源在 `server-rs/crates/platform-image/src/generated_asset_sheets/`：调用方必须传入 `grid_size` 作为 `n*n` 的 `n`，可选传入物品名称 prompt 模板和特殊设定 prompt；模块负责 sheet prompt 组装、按 `n*n` 切片、透明化、PNG 输出、OSS private upload 请求构造和 sheet / item / special prompt 元数据持久化。`server-rs/crates/api-server/src/generated_asset_sheets.rs` 只保留 `AppState` / `AppError` 适配和兼容导出。玩法只负责规划 slot、调用具体生图 provider、计费、失败回写，以及把通用切片结果映射回自己的 DTO / 草稿 / runtime 字段。
 
 ## SpacetimeDB schema 变更规则
 
@@ -174,7 +175,7 @@ npm run check:server-rs-ddd
 - 敲木鱼敲击物和背景环境图：VectorEngine `/v1/images/edits`，模型固定 `gpt-image-2`。敲击物支持 multipart 多参考图，第一张固定为后端内嵌默认木鱼图，用户上传图只作为新主题参考；prompt 必须要求 `1:1` 真实透明 alpha PNG 并禁止黑底、白底、棋盘格和任何实底背景。当前敲击物上传 OSS 前不做服务端抠图后处理，避免误伤玉米等主体像素。背景环境图只使用第一步抠图完成后的透明敲击物图作为参考，prompt 必须要求中央主体预留区保持干净，中央 40% 区域禁止出现主题主体、主体局部特写、轮廓影子或重复元素，主题元素只能作为外围氛围，且必须显式声明不继承任何绿色底色、绿幕底色或纯绿色画布。
 - Hyper3D / Rodin：只保留后端安全代理和旧数据兼容；Rodin 提交、状态、下载和响应解析归属 `platform-hyper3d`，`api-server/src/hyper3d_generation.rs` 只做路由、配置和错误 envelope 映射；新 Match3D 草稿和批量新增不再生成 GLB。
 - 音频：视觉小说专用音频路由保留；VectorEngine Suno/Vidu provider 协议、任务提交/查询、音频 URL 提取、下载、MIME/extension 归一和 OSS put 请求准备归属 `platform-audio`。`api-server/src/vector_engine_audio_generation.rs` 只做路由、配置、计费、asset object confirm、entity binding 和错误 envelope 映射；拼图、抓大鹅和敲木鱼提示词生成音效入口暂时关闭，通用 `/api/creation/audio/*` 对这些目标返回 `410 Gone`。敲木鱼创作只接收上传 / 录音音频资产；未提供时由 `api-server` 写回内置默认木鱼音 `/wooden-fish/default-hit-sound.mp3`。
-- OSS：私有 generated legacy path 进入浏览器前必须通过 `/api/assets/read-url` 换签；不要裸请求 `/generated-*`。
+- OSS：私有 generated legacy path 进入浏览器前必须通过 `/api/assets/read-url` 换签；不要裸请求 `/generated-*`。OSS 签名、读签名、HEAD 和 PUT 的结构化日志由 `platform-oss` 输出，排查资产写入 / 确认失败时优先按 `operation`、`object_key` / `key_prefix`、`status_class`、`error_kind` 和 `elapsed_ms` 下钻。
 - 外部 API 失败审计：外部供应商调用未成功时，`api-server` 必须发送 OTLP 失败事件并写入 `tracking_event`。VectorEngine 图片 provider 在 `platform-image` 内输出结构化日志和 `PlatformImageFailureAudit`，覆盖 `request_send`、`response_body`、`upstream_status`、`response_parse`、`missing_image` 和 `image_download` 阶段；`api-server` 只把该 audit 映射成 `external_api_call_failure`，`scope_kind = module`、`scope_id = provider`、`module_key = external-api`。metadata 固定包含 provider、endpoint、operation、failureStage、statusCode、statusClass、timeout、retryable、errorMessage、latencyMs、promptChars、referenceImageCount、imageModel、rawExcerpt，以及在调用方可获得上下文时补充的 `userId`（触发者）和 `profileId`（草稿 / 作品 / 场景作用域）。图片生成入口应优先把 owner user id 和 profile id 透传到失败审计，不要只保留 provider 级聚合，否则很难按“谁触发、哪个作品触发”定位问题。入库优先复用 tracking outbox，outbox 不可写或保护阈值拒绝时回退同步写 SpacetimeDB；不得新增前端兜底或在 SpacetimeDB reducer 内做外部 I/O。
 - 外部生成运行记录：所有外部生成编排的完成态统一写入 `tracking_event`，`event_key = external_generation_run`，`scope_kind = module`，`scope_id = provider`，`module_key = external-generation`。metadata 固定包含 `runId`、`provider`、`operation`、`requestLabel`、`requestPayload`、`status`、`success`、`failureReason`、`providerRequestId`、`resultPayload`、`startedAtMicros`、`completedAtMicros` 和 `durationMs`。这类记录只用于运行审计和排障，不再走 `ai_task` 旧表。
 
diff --git a/docs/【开发运维】本地开发验证与生产运维-2026-05-15.md b/docs/【开发运维】本地开发验证与生产运维-2026-05-15.md
index 55514d35..c22cfd7c 100644
--- a/docs/【开发运维】本地开发验证与生产运维-2026-05-15.md
+++ b/docs/【开发运维】本地开发验证与生产运维-2026-05-15.md
@@ -293,6 +293,7 @@ OpenTelemetry 现阶段默认开启 OTLP traces / metrics / logs，但本地日
 - api-server 会随 metrics 发送进程级指标：`process.memory.usage`、`process.memory.virtual`、`process.cpu.time`、`genarrative.process.cpu.usage_percent`、`process.thread.count`、`genarrative.process.memory.private`；Windows 额外发送 `process.windows.handle.count`，Linux 额外发送 `process.unix.file_descriptor.count`。这些指标只描述当前进程，不携带请求、用户或作品 label。
 - HTTP 运行态补充发送 `genarrative.http.server.response_bodies.in_flight` 与 `genarrative.http.server.request_permits.available`，后者带低基数 `pool=default|gallery|detail|admin` label，用于区分业务 handler / 背压 permit 是否仍被占用；拼图广场热点缓存补充发送 `genarrative.puzzle_gallery.cache.*` 指标，记录 fresh hit、stale hit、未命中、后台刷新开始 / 失败、重建耗时和预序列化 data JSON 字节数。
 - 外部 API 失败统一发送 OTLP 并落库。当前 VectorEngine `gpt-image-2` 图片生成 / 编辑失败由 `platform-image` provider 输出结构化日志字段，字段包括 provider、endpoint、failure_stage、status、source、source_chain、source_chain_depth、timeout、retryable、latency_ms、prompt_chars、reference_image_count、image_model、request_params 和 raw_excerpt；图片编辑请求参数日志还会带 reference_image_bytes_total，并在 request_params.referenceImages 中记录每个 multipart `image` part 的 fileName、mimeType 和 bytes，不记录 API key 或原始图片 bytes；`api-server` 再记录指标 `genarrative.external_api.failures{provider,failure_stage,status_class,retryable}`，并写入 `tracking_event`，`event_key = external_api_call_failure`、`module_key = external-api`、`scope_kind = module`、`scope_id = provider`。调用方能拿到身份上下文时，失败事件还会在行级 `user_id` / `owner_user_id` / `profile_id` 和 `metadata_json.userId` / `metadata_json.profileId` / `metadata_json.requestId` / `metadata_json.errorSource` 中记录触发者、草稿 / 作品作用域、请求标识和传输错误链。排障时先按 provider / failureStage 聚合，再下钻 userId / profileId，最后结合 request 日志、errorSource 和上游响应 excerpt 判断是限流、超时、解析失败还是未返回图片。
+- OSS 平台适配器也输出结构化日志，覆盖 `sign_post_object`、`sign_get_object_url`、`head_object` 和 `put_object`。排查资产签名、上传或确认失败时，先按 `provider=aliyun-oss` 与 `operation` 过滤，再看 `object_key` / `key_prefix`、`status`、`status_class`、`error_kind`、`content_length`、`content_type` 和 `elapsed_ms`；日志不得包含 AccessKey、policy、signature、Authorization header 或完整 signed URL。
 - SpacetimeDB 观测分为两类：procedure / reducer 调用继续用 `genarrative.spacetime.procedure.*`，订阅本地 cache 读使用 `genarrative.spacetime.read.*`。`read=list_puzzle_gallery` 表示拼图广场当前从 `puzzle_gallery_card_view` 本地 cache 读取，不再每个 HTTP 请求调用 `list_puzzle_gallery` procedure。
 - 本地 Windows 直连压测的内存高水位要结合 K6 VU / 连接数解释。250 RPS 下过高 `PREALLOCATED_VUS` 可能让 300 个本地 Established 连接把 `api-server` private memory 瞬时推到 GB 级，且 `/healthz` 小响应也能复现；若压测结束后回落、`response_bodies.in_flight` 和背压 permit 未显示业务积压，应优先按连接 / 发送链路高水位处理，而不是判断为 SpacetimeDB 或 JSON 缓存泄漏。
 - Rider 的 Logs 面板只展示 log event 自身字段，不会自动展开父 span 的全部 attributes；请求完成日志会直接带 `request_id`、`http.request.method`、`http.route`、`url.scheme`、`url.path`、`http.response.status_code`、`status_class`、`latency_ms` 和 `slow_request`，完整链路继续到 Traces 面板按 trace/span 查看。
diff --git a/server-rs/Cargo.lock b/server-rs/Cargo.lock
index e80fbd9c..4024b992 100644
--- a/server-rs/Cargo.lock
+++ b/server-rs/Cargo.lock
@@ -2436,6 +2436,7 @@ dependencies = [
  "sha2",
  "time",
  "tokio",
+ "tracing",
 ]
 
 [[package]]
diff --git a/server-rs/crates/platform-oss/Cargo.toml b/server-rs/crates/platform-oss/Cargo.toml
index 216e5955..2b8a9b9e 100644
--- a/server-rs/crates/platform-oss/Cargo.toml
+++ b/server-rs/crates/platform-oss/Cargo.toml
@@ -12,6 +12,7 @@ serde = { workspace = true }
 serde_json = { workspace = true }
 sha2 = { workspace = true }
 time = { workspace = true, features = ["formatting"] }
+tracing = { workspace = true }
 
 [dev-dependencies]
 tokio = { workspace = true, features = ["macros", "rt"] }
diff --git a/server-rs/crates/platform-oss/README.md b/server-rs/crates/platform-oss/README.md
index 025481d3..84d38def 100644
--- a/server-rs/crates/platform-oss/README.md
+++ b/server-rs/crates/platform-oss/README.md
@@ -22,6 +22,7 @@
 5. 服务端 `PutObject` 上传 helper
 6. `x-oss-meta-*` 元数据归一化与大小限制校验
 7. `content-type`、`content-length-range`、`success_action_status` policy 条件生成
+8. `PostObject` 签名、`GetObject` 读签名、`HEAD Object` 和 `PutObject` 的结构化日志
 
 当前仍未落地的内容：
 
@@ -34,8 +35,9 @@
 1. 当前产品口径为服务器上传 AI 生成资源、Web 端只负责读取。
 2. 因此 `STS` 不作为默认上传主链，`api-server` 只暴露禁用式 contract，避免浏览器拿到 OSS 写权限。
 3. 服务端生成资源应优先复用 `OssClient::put_object`，上传成功后再走对象确认链路写入 `asset_object`。
-    4. 读签名和 `HEAD Object` 的入参必须直接传 object_key，不要把 bucket 名拼进路径；例如 `generated-square-hole-assets/.../image.png` 才是正确入参，`xushi-dev/...` 这类前缀不属于 object_key。
-    5. OSS V4 `x-oss-date` 必须固定为 `yyyyMMdd'T'HHmmss'Z'`，不能依赖 `time::Time::to_string()`；后者在小时小于 10 时可能输出非补零时间，导致签名格式错误。
+4. 读签名和 `HEAD Object` 的入参必须直接传 object_key，不要把 bucket 名拼进路径；例如 `generated-square-hole-assets/.../image.png` 才是正确入参，`xushi-dev/...` 这类前缀不属于 object_key。
+5. OSS V4 `x-oss-date` 必须固定为 `yyyyMMdd'T'HHmmss'Z'`，不能依赖 `time::Time::to_string()`；后者在小时小于 10 时可能输出非补零时间，导致签名格式错误。
+6. 结构化日志只记录 `provider`、`operation`、`bucket`、`endpoint`、`object_key` / `key_prefix`、`access`、`content_type`、`content_length`、`status`、`status_class`、`error_kind` 和 `elapsed_ms` 等排障字段；禁止输出 AccessKey、policy、signature、Authorization header 或完整 signed URL。
 
 ## 3. 边界约束
 
diff --git a/server-rs/crates/platform-oss/src/lib.rs b/server-rs/crates/platform-oss/src/lib.rs
index a9b3935e..656db455 100644
--- a/server-rs/crates/platform-oss/src/lib.rs
+++ b/server-rs/crates/platform-oss/src/lib.rs
@@ -1,4 +1,4 @@
-use std::{collections::BTreeMap, error::Error, fmt};
+use std::{collections::BTreeMap, error::Error, fmt, time::Instant};
 
 use base64::{Engine as _, engine::general_purpose::STANDARD as BASE64_STANDARD};
 use hmac::{Hmac, Mac};
@@ -7,6 +7,7 @@ use serde::{Deserialize, Serialize};
 use serde_json::{Value, json};
 use sha2::{Digest, Sha256};
 use time::{Duration, OffsetDateTime, format_description::well_known::Rfc3339};
+use tracing::{info, warn};
 
 type HmacSha256 = Hmac<Sha256>;
 
@@ -19,6 +20,7 @@ const OSS_V4_ALGORITHM: &str = "OSS4-HMAC-SHA256";
 const OSS_V4_REQUEST: &str = "aliyun_v4_request";
 const OSS_V4_SERVICE: &str = "oss";
 const OSS_UNSIGNED_PAYLOAD: &str = "UNSIGNED-PAYLOAD";
+const OSS_PROVIDER: &str = "aliyun-oss";
 
 pub const LEGACY_PUBLIC_PREFIXES: [&str; 13] = [
     "generated-character-drafts",
@@ -369,105 +371,154 @@ impl OssClient {
         &self,
         request: OssPostObjectRequest,
     ) -> Result<OssPostObjectResponse, OssError> {
-        let max_size_bytes = request
-            .max_size_bytes
-            .unwrap_or(self.config.default_post_max_size_bytes);
-        let expire_seconds = request
-            .expire_seconds
-            .unwrap_or(self.config.default_post_expire_seconds);
-        let success_action_status = request
-            .success_action_status
-            .unwrap_or(self.config.default_success_action_status);
+        let started_at = Instant::now();
+        let requested_prefix = request.prefix.as_str();
+        let requested_content_type = request
+            .content_type
+            .as_deref()
+            .map(str::trim)
+            .unwrap_or("")
+            .to_string();
+        let requested_metadata_count = request.metadata.len();
 
-        if max_size_bytes == 0 {
-            return Err(OssError::InvalidRequest(
-                "maxSizeBytes 必须大于 0".to_string(),
-            ));
+        let result = (|| {
+            let max_size_bytes = request
+                .max_size_bytes
+                .unwrap_or(self.config.default_post_max_size_bytes);
+            let expire_seconds = request
+                .expire_seconds
+                .unwrap_or(self.config.default_post_expire_seconds);
+            let success_action_status = request
+                .success_action_status
+                .unwrap_or(self.config.default_success_action_status);
+
+            if max_size_bytes == 0 {
+                return Err(OssError::InvalidRequest(
+                    "maxSizeBytes 必须大于 0".to_string(),
+                ));
+            }
+
+            if expire_seconds == 0 {
+                return Err(OssError::InvalidRequest(
+                    "expireSeconds 必须大于 0".to_string(),
+                ));
+            }
+
+            if !(100..=999).contains(&success_action_status) {
+                return Err(OssError::InvalidRequest(
+                    "successActionStatus 必须是三位 HTTP 状态码".to_string(),
+                ));
+            }
+
+            let sanitized_segments = request
+                .path_segments
+                .iter()
+                .map(|segment| sanitize_path_segment(segment))
+                .filter(|segment| !segment.is_empty())
+                .collect::<Vec<_>>();
+            let file_name = sanitize_file_name(&request.file_name)?;
+            let object_key = build_object_key(request.prefix, &sanitized_segments, &file_name);
+            let legacy_public_path = format!("/{}", object_key);
+            let content_type = normalize_optional_value(request.content_type);
+            let metadata = normalize_metadata(request.metadata)?;
+
+            let expires_at = OffsetDateTime::now_utc()
+                .checked_add(Duration::seconds(i64::try_from(expire_seconds).map_err(
+                    |_| OssError::InvalidRequest("expireSeconds 超出可支持范围".to_string()),
+                )?))
+                .ok_or_else(|| {
+                    OssError::InvalidRequest("expireSeconds 计算结果溢出".to_string())
+                })?;
+            let expires_at = expires_at.format(&Rfc3339).map_err(|error| {
+                OssError::SerializePolicy(format!("格式化过期时间失败：{error}"))
+            })?;
+
+            let signed_at = OffsetDateTime::now_utc();
+            let signature_scope = build_v4_signature_scope(&self.config.endpoint, signed_at)?;
+            let signature_date = build_v4_signature_date(signed_at)?;
+            let credential = format!("{}/{}", self.config.access_key_id, signature_scope);
+            let policy_json = build_policy_json(
+                &self.config.bucket,
+                &object_key,
+                &expires_at,
+                max_size_bytes,
+                success_action_status,
+                content_type.as_deref(),
+                &metadata,
+                &credential,
+                &signature_date,
+            );
+            let policy = serde_json::to_string(&policy_json).map_err(|error| {
+                OssError::SerializePolicy(format!("序列化 policy 失败：{error}"))
+            })?;
+            let encoded_policy = BASE64_STANDARD.encode(policy.as_bytes());
+            let signature = sign_v4_content(
+                &self.config.access_key_secret,
+                &signature_scope,
+                &encoded_policy,
+            )?;
+
+            Ok(OssPostObjectResponse {
+                signature_version: "v4",
+                provider: OSS_PROVIDER,
+                bucket: self.config.bucket.clone(),
+                endpoint: self.config.endpoint.clone(),
+                host: self.config.upload_host(),
+                object_key: object_key.clone(),
+                legacy_public_path,
+                content_type: content_type.clone(),
+                access: request.access,
+                key_prefix: build_key_prefix(request.prefix, &sanitized_segments),
+                expires_at,
+                max_size_bytes,
+                success_action_status,
+                form_fields: OssPostObjectFormFields {
+                    key: object_key,
+                    policy: encoded_policy,
+                    signature_version: OSS_V4_ALGORITHM.to_string(),
+                    credential,
+                    date: signature_date,
+                    signature,
+                    success_action_status: success_action_status.to_string(),
+                    content_type,
+                    metadata,
+                },
+            })
+        })();
+
+        match &result {
+            Ok(response) => info!(
+                provider = OSS_PROVIDER,
+                operation = "sign_post_object",
+                bucket = %response.bucket,
+                endpoint = %response.endpoint,
+                object_key = %response.object_key,
+                key_prefix = %response.key_prefix,
+                access = oss_access_label(response.access),
+                content_type = %response.content_type.as_deref().unwrap_or(""),
+                max_size_bytes = response.max_size_bytes,
+                success_action_status = response.success_action_status,
+                metadata_count = response.form_fields.metadata.len(),
+                expires_at = %response.expires_at,
+                elapsed_ms = elapsed_ms(started_at),
+                "OSS PostObject 签名完成"
+            ),
+            Err(error) => warn!(
+                provider = OSS_PROVIDER,
+                operation = "sign_post_object",
+                bucket = %self.config.bucket(),
+                endpoint = %self.config.endpoint(),
+                key_prefix = requested_prefix,
+                content_type = %requested_content_type,
+                metadata_count = requested_metadata_count,
+                error_kind = oss_error_kind_label(error),
+                message = %error,
+                elapsed_ms = elapsed_ms(started_at),
+                "OSS PostObject 签名失败"
+            ),
         }
 
-        if expire_seconds == 0 {
-            return Err(OssError::InvalidRequest(
-                "expireSeconds 必须大于 0".to_string(),
-            ));
-        }
-
-        if !(100..=999).contains(&success_action_status) {
-            return Err(OssError::InvalidRequest(
-                "successActionStatus 必须是三位 HTTP 状态码".to_string(),
-            ));
-        }
-
-        let sanitized_segments = request
-            .path_segments
-            .iter()
-            .map(|segment| sanitize_path_segment(segment))
-            .filter(|segment| !segment.is_empty())
-            .collect::<Vec<_>>();
-        let file_name = sanitize_file_name(&request.file_name)?;
-        let object_key = build_object_key(request.prefix, &sanitized_segments, &file_name);
-        let legacy_public_path = format!("/{}", object_key);
-        let content_type = normalize_optional_value(request.content_type);
-        let metadata = normalize_metadata(request.metadata)?;
-
-        let expires_at = OffsetDateTime::now_utc()
-            .checked_add(Duration::seconds(i64::try_from(expire_seconds).map_err(
-                |_| OssError::InvalidRequest("expireSeconds 超出可支持范围".to_string()),
-            )?))
-            .ok_or_else(|| OssError::InvalidRequest("expireSeconds 计算结果溢出".to_string()))?;
-        let expires_at = expires_at
-            .format(&Rfc3339)
-            .map_err(|error| OssError::SerializePolicy(format!("格式化过期时间失败：{error}")))?;
-
-        let signed_at = OffsetDateTime::now_utc();
-        let signature_scope = build_v4_signature_scope(&self.config.endpoint, signed_at)?;
-        let signature_date = build_v4_signature_date(signed_at)?;
-        let credential = format!("{}/{}", self.config.access_key_id, signature_scope);
-        let policy_json = build_policy_json(
-            &self.config.bucket,
-            &object_key,
-            &expires_at,
-            max_size_bytes,
-            success_action_status,
-            content_type.as_deref(),
-            &metadata,
-            &credential,
-            &signature_date,
-        );
-        let policy = serde_json::to_string(&policy_json)
-            .map_err(|error| OssError::SerializePolicy(format!("序列化 policy 失败：{error}")))?;
-        let encoded_policy = BASE64_STANDARD.encode(policy.as_bytes());
-        let signature = sign_v4_content(
-            &self.config.access_key_secret,
-            &signature_scope,
-            &encoded_policy,
-        )?;
-
-        Ok(OssPostObjectResponse {
-            signature_version: "v4",
-            provider: "aliyun-oss",
-            bucket: self.config.bucket.clone(),
-            endpoint: self.config.endpoint.clone(),
-            host: self.config.upload_host(),
-            object_key: object_key.clone(),
-            legacy_public_path,
-            content_type: content_type.clone(),
-            access: request.access,
-            key_prefix: build_key_prefix(request.prefix, &sanitized_segments),
-            expires_at,
-            max_size_bytes,
-            success_action_status,
-            form_fields: OssPostObjectFormFields {
-                key: object_key,
-                policy: encoded_policy,
-                signature_version: OSS_V4_ALGORITHM.to_string(),
-                credential,
-                date: signature_date,
-                signature,
-                success_action_status: success_action_status.to_string(),
-                content_type,
-                metadata,
-            },
-        })
+        result
     }
 
     // 私有 bucket 的对象读取统一走短期签名 URL，避免把长期主凭证下发给浏览器。
@@ -475,81 +526,119 @@ impl OssClient {
         &self,
         request: OssSignedGetObjectUrlRequest,
     ) -> Result<OssSignedGetObjectUrlResponse, OssError> {
-        let expire_seconds = request
-            .expire_seconds
-            .unwrap_or(self.config.default_read_expire_seconds);
+        let started_at = Instant::now();
+        let requested_object_key = request
+            .object_key
+            .trim()
+            .trim_start_matches('/')
+            .trim()
+            .to_string();
 
-        if expire_seconds == 0 {
-            return Err(OssError::InvalidRequest(
-                "expireSeconds 必须大于 0".to_string(),
-            ));
+        let result = (|| {
+            let expire_seconds = request
+                .expire_seconds
+                .unwrap_or(self.config.default_read_expire_seconds);
+
+            if expire_seconds == 0 {
+                return Err(OssError::InvalidRequest(
+                    "expireSeconds 必须大于 0".to_string(),
+                ));
+            }
+
+            let object_key = normalize_object_key(&request.object_key)?;
+            let expires_at = OffsetDateTime::now_utc()
+                .checked_add(Duration::seconds(i64::try_from(expire_seconds).map_err(
+                    |_| OssError::InvalidRequest("expireSeconds 超出可支持范围".to_string()),
+                )?))
+                .ok_or_else(|| {
+                    OssError::InvalidRequest("expireSeconds 计算结果溢出".to_string())
+                })?;
+            let expires_at_text = expires_at
+                .format(&Rfc3339)
+                .map_err(|error| OssError::Sign(format!("格式化过期时间失败：{error}")))?;
+
+            let signed_at = OffsetDateTime::now_utc();
+            let signed_at_text = build_v4_signature_date(signed_at)?;
+            let signature_scope = build_v4_signature_scope(&self.config.endpoint, signed_at)?;
+            let credential = format!("{}/{}", self.config.access_key_id, signature_scope);
+            let mut query = BTreeMap::from([
+                ("x-oss-additional-headers".to_string(), "host".to_string()),
+                (
+                    "x-oss-signature-version".to_string(),
+                    OSS_V4_ALGORITHM.to_string(),
+                ),
+                ("x-oss-credential".to_string(), credential),
+                ("x-oss-date".to_string(), signed_at_text),
+                ("x-oss-expires".to_string(), expire_seconds.to_string()),
+            ]);
+            let canonical_uri = build_v4_canonical_uri(&self.config.bucket, Some(&object_key));
+            let object_url_path = format!("/{}", encode_url_path(&object_key));
+            let additional_headers = "host";
+            let canonical_headers =
+                format!("host:{}.{}\n", self.config.bucket(), self.config.endpoint());
+            let canonical_query = build_canonical_query_string(&query);
+            let canonical_request = build_v4_canonical_request(
+                Method::GET.as_str(),
+                &canonical_uri,
+                &canonical_query,
+                &canonical_headers,
+                additional_headers,
+                OSS_UNSIGNED_PAYLOAD,
+            );
+            let string_to_sign = build_v4_string_to_sign(
+                query["x-oss-date"].as_str(),
+                &signature_scope,
+                &canonical_request,
+            );
+            let signature = sign_v4_content(
+                &self.config.access_key_secret,
+                &signature_scope,
+                &string_to_sign,
+            )?;
+            query.insert("x-oss-signature".to_string(), signature);
+            let signed_url = format!(
+                "{}{}?{}",
+                self.config.upload_host(),
+                object_url_path,
+                build_canonical_query_string(&query)
+            );
+
+            Ok(OssSignedGetObjectUrlResponse {
+                provider: OSS_PROVIDER,
+                bucket: self.config.bucket.clone(),
+                endpoint: self.config.endpoint.clone(),
+                host: self.config.upload_host(),
+                object_key,
+                expires_at: expires_at_text,
+                signed_url,
+            })
+        })();
+
+        match &result {
+            Ok(response) => info!(
+                provider = OSS_PROVIDER,
+                operation = "sign_get_object_url",
+                bucket = %response.bucket,
+                endpoint = %response.endpoint,
+                object_key = %response.object_key,
+                expires_at = %response.expires_at,
+                elapsed_ms = elapsed_ms(started_at),
+                "OSS GetObject 读签名完成"
+            ),
+            Err(error) => warn!(
+                provider = OSS_PROVIDER,
+                operation = "sign_get_object_url",
+                bucket = %self.config.bucket(),
+                endpoint = %self.config.endpoint(),
+                object_key = %requested_object_key,
+                error_kind = oss_error_kind_label(error),
+                message = %error,
+                elapsed_ms = elapsed_ms(started_at),
+                "OSS GetObject 读签名失败"
+            ),
         }
 
-        let object_key = normalize_object_key(&request.object_key)?;
-        let expires_at = OffsetDateTime::now_utc()
-            .checked_add(Duration::seconds(i64::try_from(expire_seconds).map_err(
-                |_| OssError::InvalidRequest("expireSeconds 超出可支持范围".to_string()),
-            )?))
-            .ok_or_else(|| OssError::InvalidRequest("expireSeconds 计算结果溢出".to_string()))?;
-        let expires_at_text = expires_at
-            .format(&Rfc3339)
-            .map_err(|error| OssError::Sign(format!("格式化过期时间失败：{error}")))?;
-
-        let signed_at = OffsetDateTime::now_utc();
-        let signed_at_text = build_v4_signature_date(signed_at)?;
-        let signature_scope = build_v4_signature_scope(&self.config.endpoint, signed_at)?;
-        let credential = format!("{}/{}", self.config.access_key_id, signature_scope);
-        let mut query = BTreeMap::from([
-            ("x-oss-additional-headers".to_string(), "host".to_string()),
-            (
-                "x-oss-signature-version".to_string(),
-                OSS_V4_ALGORITHM.to_string(),
-            ),
-            ("x-oss-credential".to_string(), credential),
-            ("x-oss-date".to_string(), signed_at_text),
-            ("x-oss-expires".to_string(), expire_seconds.to_string()),
-        ]);
-        let canonical_uri = build_v4_canonical_uri(&self.config.bucket, Some(&object_key));
-        let object_url_path = format!("/{}", encode_url_path(&object_key));
-        let additional_headers = "host";
-        let canonical_headers =
-            format!("host:{}.{}\n", self.config.bucket(), self.config.endpoint());
-        let canonical_query = build_canonical_query_string(&query);
-        let canonical_request = build_v4_canonical_request(
-            Method::GET.as_str(),
-            &canonical_uri,
-            &canonical_query,
-            &canonical_headers,
-            additional_headers,
-            OSS_UNSIGNED_PAYLOAD,
-        );
-        let string_to_sign = build_v4_string_to_sign(
-            query["x-oss-date"].as_str(),
-            &signature_scope,
-            &canonical_request,
-        );
-        let signature = sign_v4_content(
-            &self.config.access_key_secret,
-            &signature_scope,
-            &string_to_sign,
-        )?;
-        query.insert("x-oss-signature".to_string(), signature);
-        let signed_url = format!(
-            "{}{}?{}",
-            self.config.upload_host(),
-            object_url_path,
-            build_canonical_query_string(&query)
-        );
-
-        Ok(OssSignedGetObjectUrlResponse {
-            provider: "aliyun-oss",
-            bucket: self.config.bucket.clone(),
-            endpoint: self.config.endpoint.clone(),
-            host: self.config.upload_host(),
-            object_key,
-            expires_at: expires_at_text,
-            signed_url,
-        })
+        result
     }
 
     // 上传完成确认前，服务端必须自己探测一次对象，不能只相信客户端回传的 object_key。
@@ -558,59 +647,107 @@ impl OssClient {
         client: &reqwest::Client,
         request: OssHeadObjectRequest,
     ) -> Result<OssHeadObjectResponse, OssError> {
-        let object_key = normalize_object_key(&request.object_key)?;
-        let target_url = build_object_url(&self.config.bucket, &self.config.endpoint, &object_key)
-            .map_err(|error| OssError::Request(format!("构造 OSS 对象 URL 失败：{error}")))?;
-        let response = send_signed_request(
-            client,
-            &self.config,
-            Method::HEAD,
-            Some(&object_key),
-            target_url,
-        )
-        .await?;
+        let started_at = Instant::now();
+        let requested_object_key = request
+            .object_key
+            .trim()
+            .trim_start_matches('/')
+            .trim()
+            .to_string();
+        let mut response_status = None;
 
-        if response.status() == reqwest::StatusCode::NOT_FOUND {
-            return Err(OssError::ObjectNotFound(format!(
-                "OSS 对象不存在：{}",
-                request.object_key
-            )));
+        let result = async {
+            let object_key = normalize_object_key(&request.object_key)?;
+            let target_url =
+                build_object_url(&self.config.bucket, &self.config.endpoint, &object_key).map_err(
+                    |error| OssError::Request(format!("构造 OSS 对象 URL 失败：{error}")),
+                )?;
+            let response = send_signed_request(
+                client,
+                &self.config,
+                Method::HEAD,
+                Some(&object_key),
+                target_url,
+            )
+            .await?;
+            response_status = Some(response.status().as_u16());
+
+            if response.status() == reqwest::StatusCode::NOT_FOUND {
+                return Err(OssError::ObjectNotFound(format!(
+                    "OSS 对象不存在：{}",
+                    request.object_key
+                )));
+            }
+
+            if !response.status().is_success() {
+                return Err(OssError::Request(format!(
+                    "OSS HEAD Object 失败，状态码：{}",
+                    response.status()
+                )));
+            }
+
+            let headers = response.headers();
+            let content_length = headers
+                .get(reqwest::header::CONTENT_LENGTH)
+                .and_then(|value| value.to_str().ok())
+                .and_then(|value| value.parse::<u64>().ok())
+                .unwrap_or(0);
+            let content_type = headers
+                .get(reqwest::header::CONTENT_TYPE)
+                .and_then(|value| value.to_str().ok())
+                .map(|value| value.to_string());
+            let etag = headers
+                .get(reqwest::header::ETAG)
+                .and_then(|value| value.to_str().ok())
+                .map(|value| value.trim_matches('"').to_string());
+            let last_modified = headers
+                .get(reqwest::header::LAST_MODIFIED)
+                .and_then(|value| value.to_str().ok())
+                .map(|value| value.to_string());
+
+            Ok(OssHeadObjectResponse {
+                bucket: self.config.bucket.clone(),
+                object_key,
+                content_length,
+                content_type,
+                etag,
+                last_modified,
+            })
+        }
+        .await;
+
+        match &result {
+            Ok(response) => info!(
+                provider = OSS_PROVIDER,
+                operation = "head_object",
+                bucket = %response.bucket,
+                endpoint = %self.config.endpoint(),
+                object_key = %response.object_key,
+                status = response_status.unwrap_or(reqwest::StatusCode::OK.as_u16()),
+                status_class = http_status_class_from_option(response_status),
+                content_length = response.content_length,
+                content_type = %response.content_type.as_deref().unwrap_or(""),
+                etag_present = response.etag.is_some(),
+                last_modified_present = response.last_modified.is_some(),
+                elapsed_ms = elapsed_ms(started_at),
+                "OSS HEAD Object 完成"
+            ),
+            Err(error) => warn!(
+                provider = OSS_PROVIDER,
+                operation = "head_object",
+                bucket = %self.config.bucket(),
+                endpoint = %self.config.endpoint(),
+                object_key = %requested_object_key,
+                status = response_status.unwrap_or_default(),
+                status_class = http_status_class_from_option(response_status),
+                error_kind = oss_error_kind_label(error),
+                message = %error,
+                elapsed_ms = elapsed_ms(started_at),
+                "OSS HEAD Object 失败"
+            ),
         }
 
-        if !response.status().is_success() {
-            return Err(OssError::Request(format!(
-                "OSS HEAD Object 失败，状态码：{}",
-                response.status()
-            )));
-        }
-
-        let headers = response.headers();
-        let content_length = headers
-            .get(reqwest::header::CONTENT_LENGTH)
-            .and_then(|value| value.to_str().ok())
-            .and_then(|value| value.parse::<u64>().ok())
-            .unwrap_or(0);
-        let content_type = headers
-            .get(reqwest::header::CONTENT_TYPE)
-            .and_then(|value| value.to_str().ok())
-            .map(|value| value.to_string());
-        let etag = headers
-            .get(reqwest::header::ETAG)
-            .and_then(|value| value.to_str().ok())
-            .map(|value| value.trim_matches('"').to_string());
-        let last_modified = headers
-            .get(reqwest::header::LAST_MODIFIED)
-            .and_then(|value| value.to_str().ok())
-            .map(|value| value.to_string());
-
-        Ok(OssHeadObjectResponse {
-            bucket: self.config.bucket.clone(),
-            object_key,
-            content_length,
-            content_type,
-            etag,
-            last_modified,
-        })
+        result
     }
 
     // AI 生成资源默认由服务端上传 OSS，Web 端只拿签名读地址，不直接持有写权限。
@@ -619,73 +756,128 @@ impl OssClient {
         client: &reqwest::Client,
         request: OssPutObjectRequest,
     ) -> Result<OssPutObjectResponse, OssError> {
-        if request.body.is_empty() {
-            return Err(OssError::InvalidRequest(
-                "服务端上传对象内容不能为空".to_string(),
-            ));
+        let started_at = Instant::now();
+        let requested_prefix = request.prefix.as_str();
+        let requested_content_type = request
+            .content_type
+            .as_deref()
+            .map(str::trim)
+            .unwrap_or("")
+            .to_string();
+        let requested_content_length = request.body.len();
+        let requested_metadata_count = request.metadata.len();
+        let mut response_status = None;
+
+        let result = async {
+            if request.body.is_empty() {
+                return Err(OssError::InvalidRequest(
+                    "服务端上传对象内容不能为空".to_string(),
+                ));
+            }
+
+            let sanitized_segments = request
+                .path_segments
+                .iter()
+                .map(|segment| sanitize_path_segment(segment))
+                .filter(|segment| !segment.is_empty())
+                .collect::<Vec<_>>();
+            let file_name = sanitize_file_name(&request.file_name)?;
+            let object_key = build_object_key(request.prefix, &sanitized_segments, &file_name);
+            let content_type = normalize_optional_value(request.content_type);
+            let metadata = normalize_metadata(request.metadata)?;
+            let target_url =
+                build_object_url(&self.config.bucket, &self.config.endpoint, &object_key).map_err(
+                    |error| OssError::Request(format!("构造 OSS 对象 URL 失败：{error}")),
+                )?;
+            let content_length = u64::try_from(request.body.len())
+                .map_err(|_| OssError::InvalidRequest("上传对象大小超出可支持范围".to_string()))?;
+            let builder = signed_request_builder(
+                client,
+                &self.config,
+                Method::PUT,
+                Some(&object_key),
+                target_url,
+                content_type.as_deref(),
+                &metadata,
+            )?
+            .header(reqwest::header::CONTENT_LENGTH, content_length)
+            .body(request.body);
+
+            let response = builder
+                .send()
+                .await
+                .map_err(|error| OssError::Request(format!("请求 OSS 失败：{error}")))?;
+            response_status = Some(response.status().as_u16());
+
+            if !response.status().is_success() {
+                return Err(OssError::Request(format!(
+                    "OSS PutObject 失败，状态码：{}",
+                    response.status()
+                )));
+            }
+
+            let headers = response.headers();
+            let etag = headers
+                .get(reqwest::header::ETAG)
+                .and_then(|value| value.to_str().ok())
+                .map(|value| value.trim_matches('"').to_string());
+            let last_modified = headers
+                .get(reqwest::header::LAST_MODIFIED)
+                .and_then(|value| value.to_str().ok())
+                .map(|value| value.to_string());
+
+            Ok(OssPutObjectResponse {
+                provider: OSS_PROVIDER,
+                bucket: self.config.bucket.clone(),
+                endpoint: self.config.endpoint.clone(),
+                host: self.config.upload_host(),
+                legacy_public_path: format!("/{object_key}"),
+                object_key,
+                content_type,
+                content_length,
+                access: request.access,
+                etag,
+                last_modified,
+            })
+        }
+        .await;
+
+        match &result {
+            Ok(response) => info!(
+                provider = OSS_PROVIDER,
+                operation = "put_object",
+                bucket = %response.bucket,
+                endpoint = %response.endpoint,
+                object_key = %response.object_key,
+                access = oss_access_label(response.access),
+                status = response_status.unwrap_or(reqwest::StatusCode::OK.as_u16()),
+                status_class = http_status_class_from_option(response_status),
+                content_length = response.content_length,
+                content_type = %response.content_type.as_deref().unwrap_or(""),
+                etag_present = response.etag.is_some(),
+                last_modified_present = response.last_modified.is_some(),
+                elapsed_ms = elapsed_ms(started_at),
+                "OSS PutObject 上传完成"
+            ),
+            Err(error) => warn!(
+                provider = OSS_PROVIDER,
+                operation = "put_object",
+                bucket = %self.config.bucket(),
+                endpoint = %self.config.endpoint(),
+                key_prefix = requested_prefix,
+                content_length = requested_content_length,
+                content_type = %requested_content_type,
+                metadata_count = requested_metadata_count,
+                status = response_status.unwrap_or_default(),
+                status_class = http_status_class_from_option(response_status),
+                error_kind = oss_error_kind_label(error),
+                message = %error,
+                elapsed_ms = elapsed_ms(started_at),
+                "OSS PutObject 上传失败"
+            ),
         }
 
-        let sanitized_segments = request
-            .path_segments
-            .iter()
-            .map(|segment| sanitize_path_segment(segment))
-            .filter(|segment| !segment.is_empty())
-            .collect::<Vec<_>>();
-        let file_name = sanitize_file_name(&request.file_name)?;
-        let object_key = build_object_key(request.prefix, &sanitized_segments, &file_name);
-        let content_type = normalize_optional_value(request.content_type);
-        let metadata = normalize_metadata(request.metadata)?;
-        let target_url = build_object_url(&self.config.bucket, &self.config.endpoint, &object_key)
-            .map_err(|error| OssError::Request(format!("构造 OSS 对象 URL 失败：{error}")))?;
-        let content_length = u64::try_from(request.body.len())
-            .map_err(|_| OssError::InvalidRequest("上传对象大小超出可支持范围".to_string()))?;
-        let builder = signed_request_builder(
-            client,
-            &self.config,
-            Method::PUT,
-            Some(&object_key),
-            target_url,
-            content_type.as_deref(),
-            &metadata,
-        )?
-        .header(reqwest::header::CONTENT_LENGTH, content_length)
-        .body(request.body);
-
-        let response = builder
-            .send()
-            .await
-            .map_err(|error| OssError::Request(format!("请求 OSS 失败：{error}")))?;
-
-        if !response.status().is_success() {
-            return Err(OssError::Request(format!(
-                "OSS PutObject 失败，状态码：{}",
-                response.status()
-            )));
-        }
-
-        let headers = response.headers();
-        let etag = headers
-            .get(reqwest::header::ETAG)
-            .and_then(|value| value.to_str().ok())
-            .map(|value| value.trim_matches('"').to_string());
-        let last_modified = headers
-            .get(reqwest::header::LAST_MODIFIED)
-            .and_then(|value| value.to_str().ok())
-            .map(|value| value.to_string());
-
-        Ok(OssPutObjectResponse {
-            provider: "aliyun-oss",
-            bucket: self.config.bucket.clone(),
-            endpoint: self.config.endpoint.clone(),
-            host: self.config.upload_host(),
-            legacy_public_path: format!("/{object_key}"),
-            object_key,
-            content_type,
-            content_length,
-            access: request.access,
-            etag,
-            last_modified,
-        })
+        result
     }
 }
 
@@ -717,6 +909,43 @@ impl OssError {
     }
 }
 
+fn elapsed_ms(started_at: Instant) -> u64 {
+    started_at.elapsed().as_millis().min(u64::MAX as u128) as u64
+}
+
+fn oss_access_label(access: OssObjectAccess) -> &'static str {
+    match access {
+        OssObjectAccess::Public => "public",
+        OssObjectAccess::Private => "private",
+    }
+}
+
+fn oss_error_kind_label(error: &OssError) -> &'static str {
+    match error.kind() {
+        OssErrorKind::InvalidConfig => "invalid_config",
+        OssErrorKind::InvalidRequest => "invalid_request",
+        OssErrorKind::ObjectNotFound => "object_not_found",
+        OssErrorKind::Request => "request",
+        OssErrorKind::SerializePolicy => "serialize_policy",
+        OssErrorKind::Sign => "sign",
+    }
+}
+
+fn http_status_class_from_option(status: Option<u16>) -> &'static str {
+    status.map(http_status_class).unwrap_or("unknown")
+}
+
+fn http_status_class(status: u16) -> &'static str {
+    match status {
+        100..=199 => "1xx",
+        200..=299 => "2xx",
+        300..=399 => "3xx",
+        400..=499 => "4xx",
+        500..=599 => "5xx",
+        _ => "unknown",
+    }
+}
+
 fn build_policy_json(
     bucket: &str,
     object_key: &str,
@@ -1295,6 +1524,18 @@ mod tests {
         );
     }
 
+    #[test]
+    fn structured_log_labels_are_stable() {
+        assert_eq!(
+            oss_error_kind_label(&OssError::InvalidRequest("bad input".to_string())),
+            "invalid_request"
+        );
+        assert_eq!(oss_access_label(OssObjectAccess::Private), "private");
+        assert_eq!(http_status_class(204), "2xx");
+        assert_eq!(http_status_class(404), "4xx");
+        assert_eq!(http_status_class_from_option(None), "unknown");
+    }
+
     fn build_client() -> OssClient {
         OssClient::new(
             OssConfig::new(