Flag Delivery v2 (FDv2) is now available in Early Access for the LaunchDarkly .NET Server-side SDK v8.11.0, bringing faster initialization, smarter data handling, and improved resiliency to feature flag delivery.

FDv2 introduces several key enhancements:

• Two-phase initialization: Start quickly from a polling data source, then synchronize from a long-lived streaming connection.
• Data-saving mode: Resume from a previously saved state during reconnects to reduce bandwidth and processing time.
• File-based initialization: Initialize from a local file first, then connect to LaunchDarkly APIs for updates.
• Automatic failover: Seamlessly switch to polling if the streaming connection fails.
• Improved flag caching: When using a persistent store in non-daemon mode, flag data is no longer limited by cache TTL.

Together, these improvements make flag delivery faster, more reliable, and more efficient across all environments.

Availability
Early Access: Data-saving mode is only available to members of LaunchDarkly’s Early Access Program (EAP). If you want access to this feature, join the EAP.

Learn more
Data-saving mode documentation