feat(o11y): add record_polling_attributes macro

Author: haphungw

src/lro/src/internal/tracing.rs

@@ -98,6 +98,21 @@ impl LroRecorder {
     }
 }
 
+/// Injects LRO-specific telemetry attributes into the active span.
+#[macro_export]
+#[doc(hidden)]
+macro_rules! record_polling_attributes {
+    ($span:expr) => {
+        #[cfg(google_cloud_unstable_tracing)]
+        {
+            if let Ok(attempt) = $crate::POLL_ATTEMPT_COUNT.try_with(|c| *c) {
+                $span.record("gcp.longrunning.poll_attempt_count", attempt);
+                $span.record("gcp.longrunning.done", false);
+            }
+        }
+    };
+}
+
 /// Decorate a poller with tracing information.
 #[derive(Clone, Debug)]
 pub struct Tracing<P> {