diff --git a/server-rs/crates/api-server/src/character_animation_assets.rs b/server-rs/crates/api-server/src/character_animation_assets.rs
index dd7899953..1cf3bdb5d 100644
--- a/server-rs/crates/api-server/src/character_animation_assets.rs
+++ b/server-rs/crates/api-server/src/character_animation_assets.rs
@@ -686,6 +686,12 @@ pub(crate) async fn generate_editor_character_animation_for_owner(
     let http_client = build_upstream_http_client(settings.ark.request_timeout_ms)
         .map_err(|error| character_animation_error_response(&request_context, error))?;
     let task_id = generate_ai_task_id(current_utc_micros());
+    // 抠图供应商失败审计上下文：逐帧阿里云抠图失败即使兜底成功，也要进 OTLP + tracking_event。
+    let matting_audit = crate::external_api_audit::ExternalApiAuditContext {
+        user_id: Some(owner_user_id.clone()),
+        profile_id: project_id.clone(),
+        request_id: Some(request_context.request_id().to_string()),
+    };
 
     let result = execute_billable_asset_operation_with_cost(
         &state,
@@ -713,6 +719,7 @@ pub(crate) async fn generate_editor_character_animation_for_owner(
                 generated.preview_video_path.as_str(),
                 &normalized,
                 &extraction_settings,
+                &matting_audit,
             )
             .await?;
 
@@ -2090,6 +2097,7 @@ async fn extract_and_persist_editor_character_animation_frames(
     preview_video_path: &str,
     request: &NormalizedEditorCharacterAnimationRequest,
     extraction_settings: &BackendFrameExtractionSettings,
+    audit: &crate::external_api_audit::ExternalApiAuditContext,
 ) -> Result<Vec<EditorCharacterAnimationFramePayload>, AppError> {
     let plan = AnimationFrameExtractionPlan {
         frame_count: request.frame_count,
@@ -2121,6 +2129,7 @@ async fn extract_and_persist_editor_character_animation_frames(
         request.frame_width,
         request.frame_height,
         request.screen_color,
+        audit,
     )
     .await?;
 
@@ -2199,6 +2208,7 @@ async fn remove_editor_character_animation_frame_backgrounds(
     frame_width: u32,
     frame_height: u32,
     screen_color: EditorScreenBackgroundColor,
+    audit: &crate::external_api_audit::ExternalApiAuditContext,
 ) -> Result<Vec<FinalizedAnimationFrame>, AppError> {
     use futures_util::{StreamExt as _, TryStreamExt as _};
 
@@ -2228,6 +2238,18 @@ async fn remove_editor_character_animation_frame_backgrounds(
                         error_details = ?error.details(),
                         "editor_animation_frame_aliyun_matting_fallback_to_local"
                     );
+                    crate::external_api_audit::record_matting_external_api_failure(
+                        state,
+                        audit,
+                        "aliyun-matting",
+                        state.config.aliyun_matting_endpoint.clone(),
+                        "editor-character-animation-frame-matting",
+                        "aliyun_segment",
+                        error.status_code().as_u16(),
+                        error.message().to_string(),
+                        Some(format!("frame_index={frame_index}")),
+                    )
+                    .await;
                     remove_editor_generated_green_screen_background(&image, screen_color)?
                 }
             };
diff --git a/server-rs/crates/api-server/src/editor_project.rs b/server-rs/crates/api-server/src/editor_project.rs
index c8e207289..eea999ee6 100644
--- a/server-rs/crates/api-server/src/editor_project.rs
+++ b/server-rs/crates/api-server/src/editor_project.rs
@@ -1554,11 +1554,20 @@ pub(crate) async fn generate_editor_image_for_owner(
             "character-image",
         )
         .await?;
+        let matting_audit = crate::external_api_audit::ExternalApiAuditContext {
+            user_id: caller.audit_subject_user_id.clone(),
+            profile_id: caller
+                .audit_project_id
+                .clone()
+                .or_else(|| payload.project_id.clone()),
+            request_id: Some(request_context.request_id().to_string()),
+        };
         image = remove_editor_generated_screen_background_with_bgfilter(
             state,
             &image,
             screen_color.expect("character generation should have screen color"),
             seg_model.expect("character generation should have BgFilter seg model"),
+            &matting_audit,
         )
         .await?;
     }
@@ -2226,6 +2235,7 @@ async fn remove_editor_generated_screen_background_with_bgfilter(
     image: &DownloadedOpenAiImage,
     screen_color: EditorScreenBackgroundColor,
     seg_model: &str,
+    audit: &crate::external_api_audit::ExternalApiAuditContext,
 ) -> Result<DownloadedOpenAiImage, AppError> {
     if let Some(remaining) = editor_bgfilter_circuit_open_remaining(state) {
         tracing::warn!(
@@ -2260,6 +2270,18 @@ async fn remove_editor_generated_screen_background_with_bgfilter(
                 error_details = ?error.details(),
                 "editor_bgfilter_fallback_to_aliyun_matting"
             );
+            crate::external_api_audit::record_matting_external_api_failure(
+                state,
+                audit,
+                "bgfilter",
+                state.config.editor_bgfilter_base_url.clone(),
+                "editor-screen-background-removal",
+                "bgfilter_segment",
+                error.status_code().as_u16(),
+                error.message().to_string(),
+                None,
+            )
+            .await;
             match crate::aliyun_matting::segment_image_with_aliyun_matting(
                 state,
                 image,
@@ -2276,6 +2298,18 @@ async fn remove_editor_generated_screen_background_with_bgfilter(
                         error_details = ?error.details(),
                         "editor_aliyun_matting_fallback_to_local_screen_background_removal"
                     );
+                    crate::external_api_audit::record_matting_external_api_failure(
+                        state,
+                        audit,
+                        "aliyun-matting",
+                        state.config.aliyun_matting_endpoint.clone(),
+                        "editor-screen-background-removal",
+                        "aliyun_segment",
+                        error.status_code().as_u16(),
+                        error.message().to_string(),
+                        None,
+                    )
+                    .await;
                     remove_editor_generated_green_screen_background(image, screen_color)
                 }
             }
@@ -2936,11 +2970,20 @@ pub(crate) async fn generate_editor_icon_spritesheet_for_owner(
         "spritesheet",
     )
     .await?;
+    let matting_audit = crate::external_api_audit::ExternalApiAuditContext {
+        user_id: caller.audit_subject_user_id.clone(),
+        profile_id: caller
+            .audit_project_id
+            .clone()
+            .or_else(|| payload.project_id.clone()),
+        request_id: Some(request_context.request_id().to_string()),
+    };
     let image = remove_editor_generated_screen_background_with_bgfilter(
         state,
         &image,
         screen_color,
         seg_model,
+        &matting_audit,
     )
     .await?;
     let (spritesheet_width, spritesheet_height) = image::load_from_memory(image.bytes.as_slice())
@@ -3204,11 +3247,20 @@ pub(crate) async fn extract_editor_ui_design_assets_for_owner(
         "spritesheet",
     )
     .await?;
+    let matting_audit = crate::external_api_audit::ExternalApiAuditContext {
+        user_id: caller.audit_subject_user_id.clone(),
+        profile_id: caller
+            .audit_project_id
+            .clone()
+            .or_else(|| payload.project_id.clone()),
+        request_id: Some(request_context.request_id().to_string()),
+    };
     let image = remove_editor_generated_screen_background_with_bgfilter(
         state,
         &image,
         screen_color,
         seg_model,
+        &matting_audit,
     )
     .await?;
     let (spritesheet_width, spritesheet_height) = image::load_from_memory(image.bytes.as_slice())
diff --git a/server-rs/crates/api-server/src/external_api_audit.rs b/server-rs/crates/api-server/src/external_api_audit.rs
index 11a104d57..cc0dc824b 100644
--- a/server-rs/crates/api-server/src/external_api_audit.rs
+++ b/server-rs/crates/api-server/src/external_api_audit.rs
@@ -130,6 +130,53 @@ impl ExternalApiFailureDraft {
         self.request_id = request_id;
         self
     }
+
+    pub(crate) fn with_audit_context(mut self, context: &ExternalApiAuditContext) -> Self {
+        self.user_id = context.user_id.clone();
+        self.profile_id = context.profile_id.clone();
+        self.request_id = context.request_id.clone();
+        self
+    }
+}
+
+/// 外部 API 失败审计的调用方上下文（用户 / 档案 / 请求 id）。
+#[derive(Clone, Debug, Default)]
+pub(crate) struct ExternalApiAuditContext {
+    pub(crate) user_id: Option<String>,
+    pub(crate) profile_id: Option<String>,
+    pub(crate) request_id: Option<String>,
+}
+
+/// 抠图供应商（BgFilter / 阿里云通用抠图）调用失败的统一失败审计入口。
+/// 即使随后兜底成功，供应商故障也必须进入 OTLP + tracking_event，不能只 warn! 后静默。
+pub(crate) async fn record_matting_external_api_failure(
+    state: &AppState,
+    context: &ExternalApiAuditContext,
+    provider: &'static str,
+    endpoint: String,
+    operation: &'static str,
+    failure_stage: &'static str,
+    status_code: u16,
+    error_message: String,
+    raw_excerpt: Option<String>,
+) {
+    let draft = ExternalApiFailureDraft::new(
+        provider,
+        endpoint,
+        operation,
+        failure_stage,
+        error_message,
+    )
+    .with_status_code(Some(status_code))
+    .with_optional_status_class(Some(status_class(Some(status_code))))
+    .with_retryable(is_retryable_external_api_failure(
+        Some(status_code),
+        false,
+        false,
+    ))
+    .with_raw_excerpt(raw_excerpt)
+    .with_audit_context(context);
+    record_external_api_failure(state, draft).await;
 }
 
 pub(crate) fn build_external_api_failure_draft_from_platform_image_audit(
@@ -306,19 +353,15 @@ fn build_external_api_failure_metadata(failure: &ExternalApiFailureDraft) -> Val
     metadata
 }
 
-#[cfg(test)]
 pub(crate) fn is_retryable_external_api_failure(
     status_code: Option<u16>,
     timeout: bool,
     connect: bool,
 ) -> bool {
+    // 429 Too Many Requests / 408 Request Timeout / 5xx 视为可重试。
     timeout
         || connect
-        || status_code.is_some_and(|status| {
-            status == StatusCode::TOO_MANY_REQUESTS.as_u16()
-                || status == StatusCode::REQUEST_TIMEOUT.as_u16()
-                || status >= 500
-        })
+        || status_code.is_some_and(|status| status == 429 || status == 408 || status >= 500)
 }
 
 fn record_external_api_failure_otlp(failure: &ExternalApiFailureDraft) {