Safely Roll Out Changes in .NET with AWS AppConfig Feature Flags

This article demonstrates how to implement feature flags in .NET applications using AWS AppConfig for safe, incremental rollouts with automatic rollback capabilities.

• Feature flags enable deploying code while keeping features inactive until explicitly enabled at runtime
• AWS AppConfig provides deployment strategies supporting gradual rollouts, real-time CloudWatch monitoring, and automatic rollback
• Implement feature flag service using AppConfig's session-based polling model with 5-minute cache TTL
• Deploy configuration changes using gradual or immediate strategies based on risk profile
• Associate CloudWatch alarms with AppConfig environments to automatically rollback deployments when error thresholds are breached
• Test both enabled and disabled code paths; remove flags once features are fully rolled out

AWS AppConfig enables safe feature releases by decoupling code deployment from feature activation, reducing deployment risk through progressive delivery and automated safety mechanisms.