Module flow_control 

Flow control, adaptive batching, and sync metrics.

Manages the delta push pipeline with:

• ACK-based flow control: in-flight window limits concurrent unACK’d deltas
• Adaptive batch sizing: AIMD algorithm adjusts batch size based on observed RTT
• Bounded pending queue: configurable limits on pending delta count and bytes
• Sync metrics: structured, observable sync state for monitoring

All state is behind tokio::sync::Mutex for use from the async sync transport.

Structs

FlowControlConfig

Flow control configuration.

FlowController

Flow controller — manages the delta push pipeline.

SyncMetrics

Sync metrics — atomic counters for lock-free concurrent access.

SyncMetricsSnapshot

Observable sync metrics — all atomic for lock-free reads.