Send client and rust version to server

Cargo.toml

@@ -23,6 +23,7 @@ reqwest = { version = "0.12.8", optional = true, default-features = false, featu
 futures-util = { version = "0.3.31", optional = true }
 derive_builder = { version = "0.20.2" }
 thiserror = "1.0.64"
+rustc_version = "0.4.1"
 
 [dev-dependencies]
 tonic-build = { version = "0.12.3", features = ["prost"] }

src/channel_pool.rs

@@ -2,6 +2,7 @@ use std::future::Future;
 use std::sync::RwLock;
 use std::time::Duration;
 
+use rustc_version::version_meta;
 use tonic::transport::{Channel, ClientTlsConfig, Uri};
 use tonic::{Code, Status};
 
@@ -44,10 +45,16 @@ impl ChannelPool {
             },
         };
 
+        let rust_version = version_meta().unwrap().semver.to_string();
+        let rust_client_version = env!("CARGO_PKG_VERSION").to_string();
+        let version_info = format!("rust-client/{} rust/{}", rust_version, rust_client_version);
+
         let endpoint = Channel::builder(self.uri.clone())
             .timeout(self.grpc_timeout)
             .connect_timeout(self.connection_timeout)
-            .keep_alive_while_idle(self.keep_alive_while_idle);
+            .keep_alive_while_idle(self.keep_alive_while_idle)
+            .user_agent(version_info)
+            .expect("Version info should be a valid header value");
 
         let endpoint = if tls {
             let tls_config = ClientTlsConfig::new().with_native_roots();