Module changelog_drainer 

Ring 1 changelog drainer Ring 1 changelog drainer.

Consumes entries from the Ring 0 StateChangelogBuffer to relieve SPSC backpressure. Runs in the background (Ring 1) on a periodic or checkpoint-triggered schedule.

Design

• Drains the SPSC buffer without allocation (reads pre-allocated entries)
• Tracks drain metrics for observability
• Supports explicit flush for checkpoint coordination
• Bounded pending buffer prevents unbounded memory growth

Structs

ChangelogDrainer

Drains a Ring 0 StateChangelogBuffer from Ring 1.