Add experimental exception_callback configuration

[alexmojaki]

Also fixes some minor issues in how exceptions were being recorded

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[Copilot]

Pull Request Overview

This PR implements an exception callback system that allows users to customize how exceptions are handled when recorded on spans. The changes add an experimental ExceptionCallback feature that provides control over exception recording behavior, issue creation, and fingerprinting.

• Adds a new ExceptionCallback type and ExceptionCallbackHelper class to customize exception handling
• Removes duplicate patches in tests and refactors to use a centralized exception recording mechanism
• Updates timing-related test assertions to use fixed timestamps instead of dynamic values

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
logfire/types.py	Introduces new types for exception callback functionality including SpanLevel, ExceptionCallbackHelper, and ExceptionCallback
logfire/_internal/config.py	Adds exception_callback field to AdvancedOptions configuration
logfire/_internal/tracer.py	Integrates exception callback into span creation and exception recording logic
logfire/_internal/main.py	Updates method signatures and removes direct calls to standalone record_exception function
logfire/sampling/_tail_sampling.py	Refactors to use the new SpanLevel class from types.py instead of local implementation
tests/test_exceptions.py	Adds comprehensive tests for the new exception callback functionality
tests/test_canonicalize_exception.py	Adds test for exception canonicalization when traceback is None
tests/test_logfire.py	Removes duplicate patches and updates test assertions with fixed timestamps
tests/otel_integrations/test_openai_agents.py	Updates test assertions with fixed timestamps and removes unused import

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[Copilot]

Pull Request Overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

tests/otel_integrations/test_fastapi.py:1

• The removal of LEVEL_NUMBERS import appears to be incomplete since the code changes show it was previously used in the test. Verify that this import removal is correct and that LEVEL_NUMBERS is not referenced elsewhere in the file.

from __future__ import annotations

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