diff --git a/objectstore-server/src/endpoints/batch.rs b/objectstore-server/src/endpoints/batch.rs
index b62219fa..11ff1091 100644
--- a/objectstore-server/src/endpoints/batch.rs
+++ b/objectstore-server/src/endpoints/batch.rs
@@ -232,7 +232,10 @@ async fn got_to_part(
         .meter_stream(stream, context)
         .try_collect::<BytesMut>()
         .await
-        .map_err(|e| ApiError::Service(e.into()))?
+        .map_err(|e| {
+            objectstore_log::error!(!!&e, "failed to collect payload stream");
+            ApiError::Service(e.into())
+        })?
         .freeze();
 
     let mut metadata_headers = metadata.to_headers("").map_err(|err| {
@@ -317,6 +320,9 @@ fn create_success_part(
 }
 
 fn create_error_part(idx: usize, error: &ApiError) -> Part {
+    // Capture the error explicitly, as it is not converted via `IntoResponse` here.
+    error.capture();
+
     let mut headers = HeaderMap::new();
     insert_index_header(&mut headers, idx);
     insert_status_header(&mut headers, error.status());
diff --git a/objectstore-server/src/endpoints/common.rs b/objectstore-server/src/endpoints/common.rs
index df33f90e..97468764 100644
--- a/objectstore-server/src/endpoints/common.rs
+++ b/objectstore-server/src/endpoints/common.rs
@@ -79,7 +79,6 @@ impl ApiError {
             ApiError::Batch(BatchError::LimitExceeded(_)) => StatusCode::PAYLOAD_TOO_LARGE,
             ApiError::Batch(BatchError::RateLimited) => StatusCode::TOO_MANY_REQUESTS,
             ApiError::Batch(BatchError::ResponseSerialization { .. }) => {
-                objectstore_log::error!(!!self, "error serializing batch response");
                 StatusCode::INTERNAL_SERVER_ERROR
             }
 
@@ -89,10 +88,7 @@ impl ApiError {
             ApiError::Auth(AuthError::UnknownKey) => StatusCode::UNAUTHORIZED,
             ApiError::Auth(AuthError::UnsupportedPresignedMethod) => StatusCode::FORBIDDEN,
             ApiError::Auth(AuthError::NotPermitted) => StatusCode::FORBIDDEN,
-            ApiError::Auth(AuthError::InternalError(_)) => {
-                objectstore_log::error!(!!self, "auth system error");
-                StatusCode::INTERNAL_SERVER_ERROR
-            }
+            ApiError::Auth(AuthError::InternalError(_)) => StatusCode::INTERNAL_SERVER_ERROR,
 
             ApiError::Service(ServiceError::Client(_)) => StatusCode::BAD_REQUEST,
             ApiError::Service(ServiceError::Metadata(_)) => StatusCode::BAD_REQUEST,
@@ -102,21 +98,31 @@ impl ApiError {
             ApiError::Service(ServiceError::InvalidUploadId(_)) => StatusCode::BAD_REQUEST,
             ApiError::Service(ServiceError::AtCapacity) => StatusCode::TOO_MANY_REQUESTS,
             ApiError::Service(ServiceError::NotImplemented) => StatusCode::NOT_IMPLEMENTED,
-            ApiError::Service(_) => {
-                objectstore_log::error!(!!self, "error handling request");
-                StatusCode::INTERNAL_SERVER_ERROR
-            }
+            ApiError::Service(_) => StatusCode::INTERNAL_SERVER_ERROR,
 
-            ApiError::Internal(_) => {
-                objectstore_log::error!(!!self, "internal error");
-                StatusCode::INTERNAL_SERVER_ERROR
-            }
+            ApiError::Internal(_) => StatusCode::INTERNAL_SERVER_ERROR,
+        }
+    }
+
+    /// Reports this error to error tracking if it indicates a server fault (5xx status).
+    ///
+    /// Call this exactly once wherever an `ApiError` is serialized into a client-visible
+    /// response: standalone responses ([`IntoResponse`]) and batch response parts.
+    pub fn capture(&self) {
+        // Captured at the source in the service layer to prevent double-logging.
+        if matches!(self, ApiError::Service(_)) {
+            return;
+        }
+
+        if self.status().is_server_error() {
+            objectstore_log::error!(!!self, "error handling request");
         }
     }
 }
 
 impl IntoResponse for ApiError {
     fn into_response(self) -> Response {
+        self.capture();
         let body = ApiErrorResponse::from_error(&self);
         (self.status(), Json(body)).into_response()
     }
diff --git a/objectstore-service/src/concurrency.rs b/objectstore-service/src/concurrency.rs
index a1602f5b..ac9bb416 100644
--- a/objectstore-service/src/concurrency.rs
+++ b/objectstore-service/src/concurrency.rs
@@ -193,7 +193,11 @@ where
         }
         .bind_hub(new_hub),
     );
-    rx.await.map_err(|_| Error::Dropped)?
+
+    rx.await.map_err(|_| {
+        objectstore_log::error!(!!&Error::Dropped, operation, "Task failed");
+        Error::Dropped
+    })?
 }
 
 #[cfg(test)]