feat(observe): allow disabling function io capture by env var

[hassiebp]

Important

Add environment variable to control IO capture in @observe decorator, improving performance for large objects.

• Environment Variables:
  • Add LANGFUSE_OBSERVE_DECORATOR_IO_CAPTURE_ENABLED to environment_variables.py to control IO capture in @observe decorator.
  • Default value is True, allowing automatic capture of function args, kwargs, and return values.
• Decorator Behavior:
  • Modify LangfuseDecorator.observe() in observe.py to check LANGFUSE_OBSERVE_DECORATOR_IO_CAPTURE_ENABLED.
  • IO capture (capture_input and capture_output) is conditional on the environment variable being True.
• Performance:
  • Disabling IO capture can improve performance for functions with large or deeply nested objects.

^{This description was created by for a9cc9f1. You can customize this summary. It will automatically update as commits are pushed.}

Greptile Summary

Disclaimer: Experimental PR review

Added environment variable LANGFUSE_OBSERVE_DECORATOR_IO_CAPTURE_ENABLED to control automatic function input/output capture in the @observe decorator, helping optimize performance when dealing with large objects.

• Added new environment variable definition in langfuse/_client/environment_variables.py with clear documentation about performance implications
• Modified langfuse/_client/observe.py to respect the environment variable setting when determining if IO capture should be enabled
• Environment variable defaults to True and combines with per-function capture flags using logical AND
• Implementation maintains type safety and consistency across both synchronous and asynchronous code paths

[greptile-apps]

LGTM

_{2 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings | Greptile}