Promesa vs realidad
Rolling updates no bastan si el esquema y el tráfico pelean.
Checklist
- Readiness probes honestos
- Migraciones expand/contract
- Canaries medibles
Conclusión
Zero-downtime es disciplina operativa, no un flag.
## Promise vs reality
Rolling updates are not enough when schema and traffic fight.
## Checklist
- Honest readiness probes
- Expand/contract migrations
- Measurable canaries
## Conclusion
Zero-downtime is ops discipline, not a flag.
