replace and fix timeout messages with a field

protocols/gossipsub/src/behaviour.rs

@@ -3078,30 +3078,28 @@ where
                 }
 
                 // Keep track of expired messages for the application layer.
+                let failed_messages = self.failed_messages.entry(propagation_source).or_default();
+                failed_messages.timeout += 1;
                 match rpc {
                     RpcOut::Publish { .. } => {
-                        self.failed_messages
-                            .entry(propagation_source)
-                            .or_default()
-                            .publish += 1;
+                        failed_messages.publish += 1;
                     }
                     RpcOut::Forward { .. } => {
-                        self.failed_messages
-                            .entry(propagation_source)
-                            .or_default()
-                            .forward += 1;
+                        failed_messages.forward += 1;
                     }
-                    _ => {} //
+                    _ => {}
                 }
 
                 // Record metrics on the failure.
                 if let Some(metrics) = self.metrics.as_mut() {
                     match rpc {
                         RpcOut::Publish { message, .. } => {
                             metrics.publish_msg_dropped(&message.topic);
+                            metrics.timeout_msg_dropped(&message.topic);
                         }
                         RpcOut::Forward { message, .. } => {
                             metrics.forward_msg_dropped(&message.topic);
+                            metrics.timeout_msg_dropped(&message.topic);
                         }
                         _ => {}
                     }

protocols/gossipsub/src/metrics.rs

@@ -131,6 +131,8 @@ pub(crate) struct Metrics {
     publish_messages_dropped: Family<TopicHash, Counter>,
     /// The number of forward messages dropped by the sender.
     forward_messages_dropped: Family<TopicHash, Counter>,
+    /// The number of messages that timed out and could not be sent.
+    timedout_messages_dropped: Family<TopicHash, Counter>,
 
     /* Metrics regarding mesh state */
     /// Number of peers in our mesh. This metric should be updated with the count of peers for a
@@ -241,6 +243,11 @@ impl Metrics {
             "Number of forward messages dropped per topic"
         );
 
+        let timedout_messages_dropped = register_family!(
+            "timedout_messages_dropped_per_topic",
+            "Number of timedout messages dropped per topic"
+        );
+
         let mesh_peer_counts = register_family!(
             "mesh_peer_counts",
             "Number of peers in each topic in our mesh"
@@ -347,6 +354,7 @@ impl Metrics {
             rejected_messages,
             publish_messages_dropped,
             forward_messages_dropped,
+            timedout_messages_dropped,
             mesh_peer_counts,
             mesh_peer_inclusion_events,
             mesh_peer_churn_events,
@@ -508,6 +516,13 @@ impl Metrics {
         }
     }
 
+    /// Register dropping a message that timedout over a topic.
+    pub(crate) fn timeout_msg_dropped(&mut self, topic: &TopicHash) {
+        if self.register_topic(topic).is_ok() {
+            self.timedout_messages_dropped.get_or_create(topic).inc();
+        }
+    }
+
     /// Register that a message was received (and was not a duplicate).
     pub(crate) fn msg_recvd(&mut self, topic: &TopicHash) {
         if self.register_topic(topic).is_ok() {

protocols/gossipsub/src/types.rs

@@ -33,7 +33,7 @@ use crate::rpc_proto::proto;
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
-/// The type of messages that have expired while attempting to send to a peer.
+/// Messages that have expired while attempting to be sent to a peer.
 #[derive(Clone, Debug, Default)]
 pub struct FailedMessages {
     /// The number of publish messages that failed to be published in a heartbeat.
@@ -44,14 +44,11 @@ pub struct FailedMessages {
     pub priority: usize,
     /// The number of messages that were failed to be sent to the non-priority queue as it was full.
     pub non_priority: usize,
+    /// The number of messages that timed out and could not be sent.
+    pub timeout: usize,
 }
 
 impl FailedMessages {
-    /// The total number of messages that expired due a timeout.
-    pub fn total_timeout(&self) -> usize {
-        self.publish + self.forward
-    }
-
     /// The total number of messages that failed due to the queue being full.
     pub fn total_queue_full(&self) -> usize {
         self.priority + self.non_priority