让 SDK 日志时间在 UTC 容器中稳定显示东八区

[zoeshawwang]

Constraint: Aone 83336550 requires quick-created Agent logs to show UTC+8 instead of UTC.

Rejected: process TZ or frontend conversion | broader blast radius and does not target SDK-emitted asctime.

Confidence: high

Scope-risk: narrow

Directive: Keep timezone policy local to SDK formatter unless future requirements make it configurable.

Tested: uv run pytest tests/unittests/test_log.py -q; TZ=UTC/Asia/Shanghai/America/Los_Angeles uv run pytest tests/unittests/test_log.py -q; uv run mypy --config-file mypy.ini agentrun/utils/log.py tests/unittests/test_log.py; git diff --check; independent code-reviewer APPROVE; architect CLEAR; UltraQA PASS.

Change-Id: I4a49664dcba0fe023fa0847b1046a0e3a9ae72ec
Co-developed-by: Codex noreply@openai.com
Not-tested: full repo mypy has unrelated pre-existing examples/conversation_service_langgraph_server.py:175 error; full pytest includes credential-gated e2e and was not used as merge gate.

Thank you for creating a pull request to contribute to Serverless Devs agentrun-sdk-python code! Before you open the request please answer the following questions to help it be more easily integrated. Please check the boxes "[ ]" with "[x]" when done too.
Please select one of the PR types below to complete

---

Fix bugs

Bug detail

The specific manifestation of the bug or the associated issue.

Pull request tasks

• Add test cases for the changes
• Passed the CI test

---

Update docs

Reason for update

Why do you need to update your documentation?

Pull request tasks

• Update Chinese documentation
• Update English documentation

---

Add contributor

Contributed content

• Code
• Document

Content detail

if content_type == 'code' || content_type == 'document':
    please tell us `PR url`，like: https://github.com/Serverless-Devs/agentrun-sdk-python/pull/1
else:
    please describe your contribution in detail

---

Others

Reason for update

Why do you need to update your documentation?

[Copilot]

Pull request overview

This PR makes SDK-emitted log timestamps stable in UTC-based containers by forcing %(asctime)s formatting to use a UTC+8 time converter inside the SDK’s CustomFormatter, with unit tests validating the behavior across log levels.

Changes:

• Add a UTC+8 converter (_utc8_converter) and apply it to all internal logging.Formatter instances used by CustomFormatter.
• Introduce unit tests ensuring CustomFormatter always formats asctime as UTC+8 for both known and fallback log levels.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
agentrun/utils/log.py	Adds a UTC+8 time converter and ensures all formatter instances used by CustomFormatter apply it for asctime.
tests/unittests/test_log.py	Adds unit tests that assert log timestamps render in UTC+8 regardless of the process timezone and for all levels.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.