Added logs for lightweights mistakes

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 2.7.9 (March 18, 2026)
+
+* Updated `lodash` to `4.17.23` to address prototype pollution vulnerability (CVE-2025-13465)
+* Updated `@elastic.io/maester-client` to `6.0.1-dev.2.1`
+* Added more informative logging for lightweight errors
+
 ## 2.7.8 (February 4, 2026)
 
 * Ensure connection before ack/nack of the message 

lib/sailor.js

@@ -393,13 +393,29 @@ class Sailor {
                             [bodyId, ...passthroughIds] = await Promise.all([
                                 that.uploadMessageBody(bodyBuf),
                                 ...passthroughBufs.map(async ({ stepId, body, id }) => {
-                                    const bodyId = id || await that.uploadMessageBody(body);
-                                    return { stepId, bodyId };
+                                    const newBodyId = id || await that.uploadMessageBody(body);
+                                    return { stepId, bodyId: newBodyId };
                                 })
                             ]);
                         } catch (e) {
-                            logger.error(e, 'Error during message/passthrough body upload');
-                            return onError(new Error('Lightweight message/passthrough body upload error'));
+                            logger.error(
+                                {
+                                    errName: e && e.name,
+                                    errMessage: e && e.message,
+                                    errCode: e && e.code,
+                                    bodySize: bodyBuf.length,
+                                    passthroughCount: passthroughBufs.length,
+                                    passthroughInfo: passthroughBufs.map(({ stepId, id }) => ({
+                                        stepId,
+                                        hasExistingId: Boolean(id)
+                                    }))
+                                },
+                                'Error during message/passthrough body upload'
+                            );
+                            const details = e && e.message ? `: ${e.message}` : '';
+                            return onError(
+                                new Error(`Lightweight message/passthrough body upload error \n${details}`)
+                            );
                         }
 
                         logger.info('Message body uploaded', { id: bodyId });