Module async_line_writer 

Async line writer using a Tokio-based actor pattern.

The actor owns a background task that performs file I/O via spawn_blocking. The handle (AsyncLineWriter) sends messages through a bounded mpsc channel, so the caller never blocks on I/O. When the handle is dropped, the channel closes and the background task finishes its current write before exiting.

This follows the “Actors with Tokio” pattern:

• Handle (AsyncLineWriter) is separate from the actor task.
• Handle is Clone (via mpsc::Sender).
• Graceful shutdown when all senders are dropped.
• Bounded channel for backpressure.

Structs

AsyncLineWriter

Asynchronous line writer that buffers writes on a background Tokio task.

AsyncLineWriterDiagnostics

Snapshot of best-effort exporter writer health.