Address PR comments

Author: utpilla

opentelemetry-otlp/examples/basic-otlp/src/main.rs

@@ -89,8 +89,12 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
     // By binding the result to an unused variable, the lifetime of the variable
     // matches the containing block, reporting traces and metrics during the whole
     // execution.
-    init_tracer()?;
-    init_metrics()?;
+
+    let result = init_tracer();
+    assert!(result.is_ok(), "Init tracer failed with error: {:?}", result.err());
+
+    let result = init_metrics();
+    assert!(result.is_ok(), "Init metrics failed with error: {:?}", result.err());
 
     // Initialize logs, which sets the global loggerprovider.
     let logger_provider = init_logs().unwrap();