Instead of 504 errors, concise errors should be surfaced to the user, instead of having to dig through CP4D/vLLM logs

"Instead of 504 errors, if it's something surfaced from vLLM like:

2025-08-22T00:41:31.362506975Z ERROR 08-22 00:41:31 [serving_chat.py:200] ValueError: This model's maximum context length is 128000 tokens. However, you requested 844373 tokens (840277 in the messages, 4096 in the completion). 

Please reduce the length of the messages or completion have meaningful error messages visible to the client so they don't have to open a support ticket to have someone triage the logs.


Business Impact

Improves client experience: Users can immediately understand and resolve errors without relying on IBM support.
Reduces support burden: Fewer L1/L2 tickets for basic error triage, freeing up IBM resources.
Accelerates adoption: Faster troubleshooting builds user confidence in watsonx/CP4D as a reliable platform.
Enhances transparency: Aligns with enterprise expectations for usable and trustworthy AI services.
Competitive Differentiation: Many cloud providers already surface actionable model errors; providing this helps IBM keep pace and exceed expectations.

Urgency

With enterprise clients (e.g., Verizon) actively deploying LLM workloads, delays caused by opaque 504 errors introduce frustration and loss of productivity. Addressing this gap will have an immediate positive impact on client trust and ongoing adoption.