Originally published on kuryzhev. cloud We had a client whose ingestion pipeline "worked fine" for eight months. Then a partner started uploading larger batch files, retries kicked in, and roughly 3% of objects just vanished — no error in the logs, no alert, nothing in CloudWatch.
Source: [Dev.to](https://dev.to/oleksandr_kuryzhev_42873f/fix-lambda-s3-trigger-error-handling-before-it-loses-events-58b4)