[Feature] consolidate cache, worker_process, and paddle logs into unified files

[xyxinyang]

Motivation

💡 If this PR is a Cherry Pick, the PR title needs to follow the format by adding the [Cherry-Pick] label at the very beginning and appending the original PR ID at the end. For example, [Cherry-Pick][CI] Add check trigger and logic(#5191)

💡 如若此PR是Cherry Pick，PR标题需遵循格式，在最开始加上[Cherry-Pick]标签，以及最后面加上原PR ID，例如[Cherry-Pick][CI] Add check trigger and logic(#5191)

1

Modifications

1

Usage or Command

1

Accuracy Tests

1

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
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• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
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[paddle-bot]

Thanks for your contribution!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.96491% with 8 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@6e16438). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
fastdeploy/utils.py	88.00%	1 Missing and 2 partials ⚠️
fastdeploy/cache_manager/cache_transfer_manager.py	0.00%	2 Missing ⚠️
fastdeploy/engine/common_engine.py	75.00%	1 Missing and 1 partial ⚠️
fastdeploy/cache_manager/prefix_cache_manager.py	50.00%	1 Missing ⚠️

Additional details and impacted files

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  Coverage           ?   74.27%           
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  Misses             ?    11406           
  Partials           ?     2744           

Flag	Coverage Δ
GPU	74.27% <85.96%> (?)

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[PaddlePaddle-bot]

🤖 AI Code Review | 2026-04-17 11:51 CST

📋 Review 摘要

PR 概述：将 cache、worker_process 和 paddle 分布式日志整合到统一文件中，减少日志碎片化，并在主日志目录创建 workerlog 软链接方便查阅。
变更范围：cache_manager/、engine/、worker/、model_executor/graph_optimization/、logger/、utils.py
影响面 Tag：Engine KVCache

📝 PR 规范检查

PR 描述的 Motivation、Modifications、Usage or Command、Accuracy Tests 各节均仅填写了 "1"，缺乏对变更动机和具体修改内容的说明。建议补充描述，方便后续追溯。

描述模板（可直接复制）：

## Motivation

Consolidate scattered log files (gpu_worker.log, model_runner_base.log, cudagraph_piecewise_backend.log, cache_storage.log, etc.) into unified files (worker_process.log, cache_manager.log) for easier debugging. Also move paddle distributed launch logs into a paddle/ subdirectory with symlinks in the main log dir.

## Modifications

1. Renamed log files: gpu_worker.log/model_runner_base.log/cudagraph_piecewise_backend.log → worker_process.log; cache_transfer.log/cache_storage.log → cache_manager.log
2. Moved paddle distributed launch logs to log/paddle/ subdirectory, with symlinks created in the main log directory
3. Changed register_manager_logger to use "main" channel instead of a separate file
4. Downgraded verbose info logs in engine_cache_queue.py to debug level
5. Added ensure_workerlog_alias utility and corresponding unit tests

问题

级别	文件	概述
🟡 建议	prefix_cache_manager.py:348	错误提示日志文件名与实际文件名不匹配
🟡 建议	utils.py:191	except OSError: pass 过于宽泛，建议至少记录警告日志

总体评价

日志整合的方向合理，将分散的日志统一到 worker_process.log 和 cache_manager.log 能显著改善调试体验。代码改动较为直接，测试覆盖充分。建议补充 PR 描述并修复错误提示中的文件名不一致问题。