Database Migrations Migration Observability

This one's for when you need proper observability around database migrations, not just blind hope and tail -f. It covers CDC pipelines with Debezium and Kafka, Prometheus metrics for tracking migration progress, and real-time monitoring of replication lag. The examples show instrumented MongoDB migrations with Winston logging, CDC event processing with consumer lag tracking, and enterprise-grade alerting setup. Honestly most teams skip this stuff until a migration silently fails at 3am, so if you're moving serious data between databases and want to actually know what's happening, this gives you the monitoring scaffolding. Good for zero-downtime migrations where you need to watch every stage.