message: image/trace: add a trace point for chunk dedup
diff: @@ -278,8 +278,11 @@ impl Node {
  trace!(
  "\t\tbuilding duplicated chunk: {} compressor {}",
  chunk,
  - compressor,
  + compressor
  );
  +
  + event_tracer!("dedup total chunk size", +chunk_size);
  + event_tracer!("dedup chunks", +1);
  continue;
  }
  }
  