Add a comment and log

Author: ackintosh

beacon_node/lighthouse_network/src/rpc/mod.rs

@@ -244,6 +244,7 @@ impl<Id: ReqId, E: EthSpec> RPC<Id, E> {
                 request.substream_id,
                 event.clone(),
             ) {
+                // Response is logged and queued internally in the response limiter.
                 return;
             }
         }

beacon_node/lighthouse_network/src/rpc/response_limiter.rs

@@ -64,6 +64,7 @@ impl<E: EthSpec> ResponseLimiter<E> {
     ) -> bool {
         // First check that there are not already other responses waiting to be sent.
         if let Some(queue) = self.delayed_responses.get_mut(&(peer_id, protocol)) {
+            debug!(self.log, "Response rate limiting since there are already other responses waiting to be sent"; "protocol" => %protocol, "peer_id" => %peer_id);
             queue.push_back(QueuedResponse {
                 peer_id,
                 connection_id,