[Revert] Revert "[Log] Wire stat loggers into AsyncOmniEngine to match AsyncLL…

[amy-why-3459]

…M (#2551)"

This reverts commit 5d58abb.

PLEASE FILL IN THE PR DESCRIPTION HERE ENSURING ALL CHECKLIST ITEMS (AT THE BOTTOM) HAVE BEEN CONSIDERED.

Purpose

This PR resulted in a significant performance degradation of the Qwen3-Omni.

Test Plan

vllm bench serve \
    --omni \
  --dataset-name random \
  --port 28889 \
  --max-concurrency 10 \
  --model /home/models/Qwen/Qwen3-Omni-30B-A3B-Instruct \
  --endpoint /v1/chat/completions \
  --backend openai-chat-omni \
  --num-prompts 100 \
  --random-input-len 100 \
  --ignore-eos \
  --percentile-metrics ttft,tpot,itl,e2el,audio_ttfp,audio_rtf \
  --random-output-len 100 \
  --extra_body '{"modalities": ["text", "audio"]}'

Test Result

Before this PR:

============ Serving Benchmark Result ============
Successful requests:                     100
Failed requests:                         0
Maximum request concurrency:             10
Benchmark duration (s):                  786.00
Request throughput (req/s):              0.13
Peak concurrent requests:                15.00
----------------End-to-end Latency----------------
Mean E2EL (ms):                          73081.40
Median E2EL (ms):                        74923.60
P99 E2EL (ms):                           141293.25
================== Text Result ===================
Total input tokens:                      11400
Total generated tokens:                  9753
Output token throughput (tok/s):         12.41
Peak output token throughput (tok/s):    260.00
Peak concurrent requests:                15.00
Total Token throughput (tok/s):          26.91
---------------Time to First Token----------------
Mean TTFT (ms):                          300.15
Median TTFT (ms):                        79.13
P99 TTFT (ms):                           1702.24
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          20.03
Median TPOT (ms):                        14.26
P99 TPOT (ms):                           44.94
---------------Inter-token Latency----------------
Mean ITL (ms):                           19.21
Median ITL (ms):                         12.50
P99 ITL (ms):                            141.90
================== Audio Result ==================
Total audio duration generated(s):       3340.60
Total audio frames generated:            80174100
Audio throughput(audio duration/s):      4.25
---------------Time to First Packet---------------
Mean AUDIO_TTFP (ms):                    55828.35
Median AUDIO_TTFP (ms):                  57789.24
P99 AUDIO_TTFP (ms):                     127832.68
-----------------Real Time Factor-----------------
Mean AUDIO_RTF:                          2.24
Median AUDIO_RTF:                        2.13
P99 AUDIO_RTF:                           4.27
==================================================

After this PR:

============ Serving Benchmark Result ============
Successful requests:                     100
Failed requests:                         0
Maximum request concurrency:             10
Benchmark duration (s):                  216.69
Request throughput (req/s):              0.46
Peak concurrent requests:                14.00
----------------End-to-end Latency----------------
Mean E2EL (ms):                          20828.36
Median E2EL (ms):                        21234.42
P99 E2EL (ms):                           25964.29
================== Text Result ===================
Total input tokens:                      11400
Total generated tokens:                  9715
Output token throughput (tok/s):         44.83
Peak output token throughput (tok/s):    265.00
Peak concurrent requests:                14.00
Total Token throughput (tok/s):          97.44
---------------Time to First Token----------------
Mean TTFT (ms):                          1700.18
Median TTFT (ms):                        1060.38
P99 TTFT (ms):                           6937.31
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          51.93
Median TPOT (ms):                        51.86
P99 TPOT (ms):                           79.57
---------------Inter-token Latency----------------
Mean ITL (ms):                           49.47
Median ITL (ms):                         0.01
P99 ITL (ms):                            1067.63
================== Audio Result ==================
Total audio duration generated(s):       3295.06
Total audio frames generated:            79081155
Audio throughput(audio duration/s):      15.21
---------------Time to First Packet---------------
Mean AUDIO_TTFP (ms):                    3208.85
Median AUDIO_TTFP (ms):                  2684.91
P99 AUDIO_TTFP (ms):                     8015.75
-----------------Real Time Factor-----------------
Mean AUDIO_RTF:                          0.64
Median AUDIO_RTF:                        0.63
P99 AUDIO_RTF:                           0.88
==================================================

---

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan. Please provide the test scripts & test commands. Please state the reasons if your codes don't require additional test scripts. For test file guidelines, please check the test style doc
• The test results. Please paste the results comparison before and after, or the e2e results.
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model. Please run mkdocs serve to sync the documentation editions to ./docs.
• (Optional) Release notes update. If your change is user-facing, please update the release notes draft.

BEFORE SUBMITTING, PLEASE READ https://github.com/vllm-project/vllm-omni/blob/main/CONTRIBUTING.md (anything written below this line will be removed by GitHub Actions)

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[amy-why-3459]

Please take a look and help add a nightly-test label. @gcanlin

[gcanlin]

LGTM, thanks for fixing!