chore: checkpoint before Python removal

vendor/tower/src/load_shed/layer.rs

@@ -0,0 +1,33 @@
+use std::fmt;
+use tower_layer::Layer;
+
+use super::LoadShed;
+
+/// A [`Layer`] to wrap services in [`LoadShed`] middleware.
+///
+/// [`Layer`]: crate::Layer
+#[derive(Clone, Default)]
+pub struct LoadShedLayer {
+    _p: (),
+}
+
+impl LoadShedLayer {
+    /// Creates a new layer.
+    pub const fn new() -> Self {
+        LoadShedLayer { _p: () }
+    }
+}
+
+impl<S> Layer<S> for LoadShedLayer {
+    type Service = LoadShed<S>;
+
+    fn layer(&self, service: S) -> Self::Service {
+        LoadShed::new(service)
+    }
+}
+
+impl fmt::Debug for LoadShedLayer {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("LoadShedLayer").finish()
+    }
+}