diff --git a/src/broadcaster.zig b/src/broadcaster.zig
index c294cf9..2d8898e 100644
--- a/src/broadcaster.zig
+++ b/src/broadcaster.zig
@@ -59,6 +59,7 @@ pub const Stats = struct {
     pool_queued_bytes: std.atomic.Value(u64) = .{ .raw = 0 },
     // persist/broadcast pipeline contention
     persist_order_spins: std.atomic.Value(u64) = .{ .raw = 0 },
+    broadcast_queue_push_lock_spins: std.atomic.Value(u64) = .{ .raw = 0 },
     broadcast_queue_full: std.atomic.Value(u64) = .{ .raw = 0 },
     broadcast_queue_depth_hwm: std.atomic.Value(u32) = .{ .raw = 0 },
     broadcast_no_consumers: std.atomic.Value(u64) = .{ .raw = 0 },
@@ -275,9 +276,14 @@ pub const BroadcastQueue = struct {
         var full_spins: u32 = 0;
         while (true) {
             // acquire spinlock
+            var lock_spins: u32 = 0;
             while (self.push_lock.cmpxchgWeak(0, 1, .acquire, .monotonic) != null) {
+                lock_spins += 1;
                 std.atomic.spinLoopHint();
             }
+            if (lock_spins > 0) {
+                _ = stats.broadcast_queue_push_lock_spins.fetchAdd(lock_spins, .monotonic);
+            }
 
             const tail = self.tail.load(.monotonic);
             const next_tail = (tail + 1) % CAPACITY;
@@ -970,8 +976,12 @@ pub fn formatPrometheusMetrics(stats: *const Stats, cache_entries: usize, attrib
         \\# HELP relay_persist_order_spins_total spin iterations waiting for persist ordering lock
         \\relay_persist_order_spins_total {d}
         \\
+        \\# TYPE relay_broadcast_queue_push_lock_spins_total counter
+        \\# HELP relay_broadcast_queue_push_lock_spins_total spin iterations waiting for broadcast queue push lock
+        \\relay_broadcast_queue_push_lock_spins_total {d}
+        \\
         \\# TYPE relay_broadcast_queue_full_total counter
-        \\# HELP relay_broadcast_queue_full_total spin iterations on full broadcast queue
+        \\# HELP relay_broadcast_queue_full_total spin iterations on full broadcast queue (ring capacity)
         \\relay_broadcast_queue_full_total {d}
         \\
         \\# TYPE relay_broadcast_queue_depth_hwm gauge
@@ -984,6 +994,7 @@ pub fn formatPrometheusMetrics(stats: *const Stats, cache_entries: usize, attrib
         \\
     , .{
         stats.persist_order_spins.load(.acquire),
+        stats.broadcast_queue_push_lock_spins.load(.acquire),
         stats.broadcast_queue_full.load(.acquire),
         stats.broadcast_queue_depth_hwm.load(.acquire),
         stats.broadcast_no_consumers.load(.acquire),