Function callback_span 

pub fn callback_span(callback_type: &str) -> Span

Available on crate feature telemetry only.

Create a span for callback execution

Arguments

• callback_type - Type of callback (e.g., “before_model”, “after_agent”)

Example

use adk_telemetry::callback_span;
let span = callback_span("before_model");
let _enter = span.enter();
// Callback code here