Disclaimer: Experimental PR review

Greptile Summary

This PR adds a helpful warning message to the Langfuse client initialization process. The change detects when the OTEL_SDK_DISABLED environment variable is set to 'true' and displays a clear warning that Langfuse tracing will be disabled and no traces will appear in the UI.

The warning is strategically placed in the client constructor after authentication validation but before the LangfuseResourceManager initialization. This timing ensures that users receive immediate feedback about a configuration that would silently prevent tracing from working. The implementation uses the existing langfuse_logger and follows a simple check against the environment variable with appropriate case-insensitive handling.

This change addresses a common user experience issue where developers might have OTEL_SDK_DISABLED=true set in their environment (perhaps from other OpenTelemetry work) and then wonder why their Langfuse traces aren't appearing. Instead of silent failure, users now get explicit notification about why tracing is disabled, which significantly improves the debugging experience.

Confidence score: 5/5

• This PR is safe to merge with minimal risk as it only adds a logging statement with no functional changes
• Score reflects the simple, non-invasive nature of adding a warning message that improves user experience
• No files require special attention as this is a straightforward logging addition