fix: display served_model_name in /v1/models (#13063)

Author: Sunhaihua1

sgl-router/src/core/workflow/steps/worker_registration.rs

@@ -44,6 +44,7 @@ struct ServerInfo {
     #[serde(alias = "model")]
     model_id: Option<String>,
     model_path: Option<String>,
+    served_model_name: Option<String>,
     dp_size: Option<usize>,
     version: Option<String>,
     max_batch_size: Option<usize>,
@@ -105,6 +106,8 @@ async fn get_dp_info(url: &str, api_key: Option<&str>) -> Result<DpInfo, String>
 
     let model_id = info
         .model_id
+        .filter(|s| !s.is_empty())
+        .or(info.served_model_name.filter(|s| !s.is_empty()))
         .or_else(|| {
             info.model_path
                 .and_then(|path| path.split('/').next_back().map(|s| s.to_string()))
@@ -318,20 +321,23 @@ impl StepExecutor for DiscoverMetadataStep {
         );
 
         let discovered_labels = match connection_mode.as_ref() {
-            ConnectionMode::Http => {
-                match get_server_info(&config.url, config.api_key.as_deref()).await {
-                    Ok(server_info) => {
-                        let mut labels = HashMap::new();
-                        if let Some(model_path) = server_info.model_path {
-                            if !model_path.is_empty() {
-                                labels.insert("model_path".to_string(), model_path);
-                            }
+            ConnectionMode::Http => match get_server_info(&config.url, config.api_key.as_deref()).await {
+                Ok(server_info) => {
+                    let mut labels = HashMap::new();
+                    if let Some(model_path) = server_info.model_path {
+                        if !model_path.is_empty() {
+                            labels.insert("model_path".to_string(), model_path);
                         }
-                        Ok(labels)
                     }
-                    Err(e) => Err(e),
+                    if let Some(served_model_name) = server_info.served_model_name {
+                        if !served_model_name.is_empty() {
+                            labels.insert("served_model_name".to_string(), served_model_name);
+                        }
+                    }
+                    Ok(labels)
                 }
-            }
+                Err(e) => Err(e),
+            },
             ConnectionMode::Grpc { .. } => fetch_grpc_metadata(&config.url).await,
         }
         .unwrap_or_else(|e| {