feat: OpenTelemetry context activation POC

.gitignore

@@ -50,3 +50,4 @@ Cargo.lock
 
 
 # End of https://www.gitignore.io/api/rust,macos,visualstudiocode
+.cursor

Cargo.toml

@@ -37,7 +37,7 @@ lazy_static = { version = "1.0.2", optional = true }
 async-trait = "0.1.56"
 criterion = { version = "0.5.1", default-features = false, features = ["html_reports"] }
 opentelemetry = { version = "0.30.0", features = ["trace", "metrics"] }
-opentelemetry_sdk = { version = "0.30.0", default-features = false, features = ["trace", "rt-tokio", "experimental_metrics_custom_reader"] }
+opentelemetry_sdk = { version = "0.30.0", default-features = false, features = ["trace", "rt-tokio", "experimental_metrics_custom_reader", "testing"] }
 opentelemetry-stdout = { version = "0.30.0", features = ["trace", "metrics"] }
 opentelemetry-otlp = { version = "0.30.0", features = ["metrics", "grpc-tonic"] }
 opentelemetry-semantic-conventions = { version = "0.30.0", features = ["semconv_experimental"] }

benches/trace.rs

@@ -264,9 +264,7 @@ where
         let span = ctx.span(&id).expect("Span not found, this is a bug");
         let mut extensions = span.extensions_mut();
 
-        if let Some(builder) = extensions.remove::<SpanBuilder>() {
-            builder.with_end_time(SystemTime::now());
-        }
+        extensions.remove::<SpanBuilder>();
     }
 }
 

examples/opentelemetry-remote-context.rs

@@ -37,7 +37,7 @@ fn main() {
         let app_root = span!(tracing::Level::INFO, "app_start");
 
         // Assign parent trace from external context
-        app_root.set_parent(parent_context);
+        let _ = app_root.set_parent(parent_context);
 
         // To include tracing context in client requests from _this_ app,
         // use `context` to extract the current OpenTelemetry context.