Langfuse: Async Traces

[AkhileshNegi]

Is your feature request related to a problem?

Glific AI flows experienced an outage where flows were stuck due to no response from Kaapi. Root cause: Langfuse was returning errors while creating traces for orgs with Langfuse credentials (Bandhu, Veddis, Rocket Learning, Antara, Sneha).

As a quick fix, we marked Langfuse credentials as is_active: false to restore Kaapi responses, but traces are now not being captured.

Current behavior:

• Trace creation is synchronous
• Langfuse failures block the entire flow
• External service outages directly impact core functionality

Describe the solution you'd like

Make Langfuse trace creation asynchronous so:

• Normal flow execution continues regardless of Langfuse status
• Trace failures are logged but don't block responses
• Core functionality remains unaffected by observability layer issues

[kartpop]

should ensure async behavior for both responses/ and llm/call/ endpoint