refactor: more API metric coverage

src/influxdb_ioxd/http.rs

@@ -423,9 +423,6 @@ where
     let path = req.uri().path().to_string();
     let server = Arc::clone(&req.data::<Arc<AppServer<M>>>().expect("server state"));
 
-    // TODO - metrics. Implement a macro/something that will catch all the
-    // early returns.
-
     // TODO(edd): figure out best way of catching all errors in this observation.
     let obs = server.metrics.http_requests.observation(); // instrument request