# ── Extract metrics from decode server ────────────────────────────
        n_drafts = _fetch_metric("vllm:spec_decode_num_drafts_total")
        n_accepted = _fetch_metric("vllm:spec_decode_num_accepted_tokens_total")
    
        assert n_drafts > 0, "No spec-decode drafts were generated"
    
        acceptance_length = 1 + (n_accepted / n_drafts)
        expected = config.expected_acceptance_length
    
        print(
            f"\n{config.id}: acceptance_length={acceptance_length:.3f} "
            f"(expected={expected:.3f})"
        )
        print(f"  Drafts: {n_drafts:.0f}, Accepted: {n_accepted:.0f}")
    
        # ── Assert acceptance length (all methods) ────────────────────────
        rel_error = abs(acceptance_length - expected) / expected
>       assert rel_error <= rtol, (
            f"Acceptance length regression for {config.id}! "
            f"Expected: {expected:.3f}, "
            f"Got: {acceptance_length:.3f}, "
            f"Relative error: {rel_error:.2%} (tolerance: {rtol:.0%})"
        )
E       AssertionError: Acceptance length regression for llama3-8b-eagle3! Expected: 2.600, Got: 1.961, Relative error: 24.58% (tolerance: 5%)
E       assert 0.24578209894195022 <= 0.05

tests/v1/kv_connector/nixl_integration/test_spec_decode_acceptance.py:183: AssertionError
====================================== warnings summary =======================================
<frozen importlib._bootstrap>:488
  <frozen importlib._bootstrap>:488: DeprecationWarning: builtin type SwigPyPacked has no __module__ attribute

<frozen importlib._bootstrap>:488
  <frozen importlib._bootstrap>:488: DeprecationWarning: builtin type SwigPyObject has no __module__ attribute

../.venv/lib/python3.12/site-packages/torch/jit/_script.py:365: 14 warnings
  /home/yewentao256/.venv/lib/python3.12/site-packages/torch/jit/_script.py:365: DeprecationWarning: `torch.jit.script_method` is deprecated. Please switch to `torch.compile` or `torch.export`.
    warnings.warn(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
=================================== short test summary info ===================================
FAILED tests/v1/kv_connector/nixl_integration/test_spec_decode_acceptance.py::test_spec_decode_acceptance_length - AssertionError: Acceptance length regression for llama3-8b-eagle3! Expected: 2.600, Got: 1...
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
========================= 1 failed, 16 warnings in 124.15s (0:02:04) ==========================

================== 1 passed, 16 warnings in 97.33s (0:01:37) ==================