fix(supervisor): keep client JSON output clean - #994
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Pull request overview
This PR ensures the supervisor-client keeps its stdout strictly machine-readable JSON by redirecting tracing output to stderr, preventing log lines from corrupting JSON consumers.
Changes:
- Configure
tracing_subscriberto write formatted tracing output tostderrinstead ofstdout. - Preserve existing JSON output behavior via
println!("{}", serde_json::to_string(...))onstdout.
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Summary
Send Supervisor client tracing output to stderr so stdout remains valid machine-readable JSON.
Verification
cargo test --manifest-path dstack/Cargo.toml -p supervisor-clientcargo fmt --manifest-path dstack/Cargo.toml --allgit diff --check