From 6258b7f84723758031b399977e34f6e5c84b969d Mon Sep 17 00:00:00 2001
From: Kevin Wang <wy721@qq.com>
Date: Tue, 4 Aug 2026 04:18:56 -0700
Subject: [PATCH] fix(supervisor): keep client JSON output clean

---
 dstack/supervisor/client/src/main.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dstack/supervisor/client/src/main.rs b/dstack/supervisor/client/src/main.rs
index 4f50793e5..16d8c61a5 100644
--- a/dstack/supervisor/client/src/main.rs
+++ b/dstack/supervisor/client/src/main.rs
@@ -50,7 +50,11 @@ async fn main() -> Result<()> {
     {
         use tracing_subscriber::{fmt, EnvFilter};
         let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
-        fmt().with_env_filter(filter).with_ansi(false).init();
+        fmt()
+            .with_env_filter(filter)
+            .with_ansi(false)
+            .with_writer(std::io::stderr)
+            .init();
     }
 
     let cli = Cli::parse();