bug: Disable debug output

[Lunik]

Describe the bug

As of right now, each time a trace is recorded to Langfuse, a debug log is displayed to the stdout. This is a security issue because it can leak sensitive information (input/ouput completion)

To reproduce

Launch a Languse instance and make a trace with completion

Additional information

A boolean to enable or disable this behaviour should be enought

[hookenful]

There is LANGFUSE_DEBUG=false environment variable or callback's param debug=False depends whether you use full SDK or callbacks

[marcklingen]

to confirm, @Lunik you suggest to toggle this behavior on the langfuse api, not on the sdks as @hookenful suggested?

[tmyjoe]

I have also come across the same issue. To illustrate, the log output on this particular line is an example of the concern:

langfuse/web/src/pages/api/public/ingestion.ts

Line 260 in 7c5a49b

`handling single event ${event.id} ${JSON.stringify(restEvent)}`,

It would be beneficial to introduce a configuration option that toggle this log output ON or OFF.

[tmyjoe]

The log has been reduced in 2.37.3, but it seems that the Input is still being outputted in cases where there is no Output yet.
Additionally, a similar problem was found in this location as well:
https://github.com/langfuse/langfuse/blob/v2.37.3/web/src/pages/api/public/traces.ts#L59