🔭 Sneak Peak - Evented Telemetry Support with support for driver based OpenTelemetry for platforms like phoenix

[vinitkadam03]

🔭 Sneak Peek: OpenTelemetry + Phoenix Driver for Prism PHP

I’ve been experimenting with early OpenTelemetry instrumentation for Prism PHP along with a built-in Phoenix driver, and the initial results look promising.

Right now, we can already visualize the full streaming flow in Phoenix:

• Root span for prism.text.asStream
• Nested streamStep spans
• toolCall spans with timing
• Clear end-to-end latency view

This significantly improves visibility into multi-step streaming chains. Also visualization for embedding, text handlers etc are supported. This internally dispatches simple laravel events and adds open telemetry based observability platforms like phoenix as a driver. Thus, one can also integrate telescope, pulse, etc.

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🚀 What More We Can Unlock

Currently I am mainly tracks step-level events, but there’s room to go deeper:

• Track full request timing (including time to first chunk)
• Token usage per step and aggregated totals
• Better separation of model vs tool latency
• Cost tracking once PR Feat: 💰 Track cost in Usage value object #920 is merged

Adopting a central streaming handler (see #894) would make this much easier to implement cleanly without duplicating instrumentation across the codebase.

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This is still an early sneak peek, but it shows strong potential to make Prism much more production-observable. Feedback welcome!