chore: export NodeHealthProxyLayer (#5768)

Co-authored-by: command-bot <>

prdoc/pr_5768.prdoc

+title: "export NodeHealthProxyLayer"
+
+doc:
+  - audience: Node Dev
+    description: |
+      This PR export `NodeHealthProxyLayer` from sc-rpc-server.
+
+crates:
+  - name: sc-rpc-server
+    bump: patch

substrate/client/rpc-servers/src/lib.rs

@@ -32,7 +32,6 @@ use jsonrpsee::{
 	},
 	Methods, RpcModule,
 };
-use middleware::NodeHealthProxyLayer;
 use tower::Service;
 use utils::{
 	build_rpc_api, deny_unsafe, format_listen_addrs, get_proxy_ip, ListenAddrError, RpcSettings,
@@ -43,7 +42,7 @@ pub use jsonrpsee::{
 	core::id_providers::{RandomIntegerIdProvider, RandomStringIdProvider},
 	server::{middleware::rpc::RpcServiceBuilder, BatchRequestConfig},
 };
-pub use middleware::{Metrics, MiddlewareLayer, RpcMetrics};
+pub use middleware::{Metrics, MiddlewareLayer, NodeHealthProxyLayer, RpcMetrics};
 pub use utils::{RpcEndpoint, RpcMethods};
 
 const MEGABYTE: u32 = 1024 * 1024;