Question

Finance reports that ~0.2% of `ledger-events` are missing from the downstream warehouse — reconciliation finds gaps with no corresponding Kafka record. No consumer lag, no errors in consumer logs, exactly-once is NOT enabled. Dashboards: the `ledger-events` topic has `replication.factor=3` but `min.insync.replicas=1`; broker logs show two unclean leader elections in the last 24h during a rolling broker restart for an OS patch. The producer config is `acks=1`, `retries=0`. The gaps correlate in time with the broker restarts. Triage and explain the loss.