From a33c026d7e904340ec51fb0642529f814f97a45d Mon Sep 17 00:00:00 2001
From: Fabien SAVY <fabien.savy@stormshield.eu>
Date: Fri, 27 Feb 2026 15:02:09 +0100
Subject: [PATCH] add metric for spurious congestion events

---
 quinn-proto/src/connection/mod.rs   | 1 +
 quinn-proto/src/connection/stats.rs | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/quinn-proto/src/connection/mod.rs b/quinn-proto/src/connection/mod.rs
index 958311339d..845e81b6ab 100644
--- a/quinn-proto/src/connection/mod.rs
+++ b/quinn-proto/src/connection/mod.rs
@@ -1456,6 +1456,7 @@ impl Connection {
         };
 
         if self.detect_spurious_loss(&ack, space) {
+            self.stats.path.spurious_congestion_events += 1;
             self.path.congestion.on_spurious_congestion_event();
         }
 
diff --git a/quinn-proto/src/connection/stats.rs b/quinn-proto/src/connection/stats.rs
index f62e62ee6c..94779d0143 100644
--- a/quinn-proto/src/connection/stats.rs
+++ b/quinn-proto/src/connection/stats.rs
@@ -140,6 +140,8 @@ pub struct PathStats {
     pub cwnd: u64,
     /// Congestion events on the connection
     pub congestion_events: u64,
+    /// Spurious congestion events on the connection
+    pub spurious_congestion_events: u64,
     /// The amount of packets lost on this path
     pub lost_packets: u64,
     /// The amount of bytes lost on this path