1 files changed, 10 insertions, 0 deletions
diff --git a/src/swarm/stats.rs b/src/swarm/stats.rs
index 8172233..308c2a5 100644
--- a/src/swarm/stats.rs
+++ b/src/swarm/stats.rs
@@ -31,6 +31,7 @@ struct Inner {
     stale_hello_replies: u64,
     relay: Relay,
     blob_requests_dropped: u64,
+    largest_sync_received: u64,
     saved_size: Option<SavedSize>,
     measuring: bool,
     /// The document version (`AppState::change_tx`) and epoch the saved size is of.
@@ -122,6 +123,8 @@ pub(crate) struct Snapshot {
     pub(crate) stale_hello_replies: u64,
     pub(crate) relay: Relay,
     pub(crate) blob_requests_dropped: u64,
+    /// The largest sync message received (its Automerge part, in bytes).
+    pub(crate) largest_sync_received: u64,
     pub(crate) propagation: Propagation,
 }
 
@@ -181,6 +184,12 @@ impl NodeStats {
         self.lock().relay.pulls_queued += 1;
     }
 
+    /// A sync message of `bytes` arrived.
+    pub(crate) fn sync_received(&self, bytes: usize) {
+        let mut inner = self.lock();
+        inner.largest_sync_received = inner.largest_sync_received.max(bytes as u64);
+    }
+
     /// A blob request went unanswered: too many were being answered.
     pub(crate) fn blob_request_dropped(&self) {
         self.lock().blob_requests_dropped += 1;
@@ -237,6 +246,7 @@ impl NodeStats {
             stale_hello_replies: inner.stale_hello_replies,
             relay: inner.relay,
             blob_requests_dropped: inner.blob_requests_dropped,
+            largest_sync_received: inner.largest_sync_received,
             propagation: inner.propagation,
         }
     }