feat(udp,http3): add UDP datagram handler relay support and stream HTTP/3 request bodies to backends

rust/crates/rustproxy-passthrough/src/udp_session.rs

@@ -18,6 +18,8 @@ use tracing::debug;
 
 use rustproxy_metrics::MetricsCollector;
 
+use crate::connection_tracker::ConnectionTracker;
+
 /// A single UDP session (flow).
 pub struct UdpSession {
     /// Socket bound to ephemeral port, connected to backend
@@ -165,6 +167,7 @@ impl UdpSessionTable {
         &self,
         timeout_ms: u64,
         metrics: &MetricsCollector,
+        conn_tracker: &ConnectionTracker,
     ) -> usize {
         let now_ms = self.elapsed_ms();
         let mut removed = 0;
@@ -185,6 +188,7 @@ impl UdpSessionTable {
                     session.client_addr, key.1,
                     now_ms.saturating_sub(session.last_activity.load(Ordering::Relaxed))
                 );
+                conn_tracker.connection_closed(&session.source_ip);
                 metrics.connection_closed(
                     session.route_id.as_deref(),
                     Some(&session.source_ip.to_string()),