Log HTTP responses with correct severity and include status reason (#1251)

* Log non-2xx HTTP responses in request completion log

* fix log message

Author: lovasoa

src/webserver/http.rs

@@ -371,13 +371,17 @@ impl RootSpanBuilder for SqlPageRootSpanBuilder {
         DefaultRootSpanBuilder::on_request_end(span, outcome);
 
         // Emit a single log event per completed request so it appears in logs.
-        // Error responses (4xx/5xx) are already logged by our error handlers.
         let _enter = span_ref.enter();
         if let Ok(response) = outcome {
             let status = response.response().status();
-            if status.is_success() || status.is_redirection() {
-                log::info!("{}", status.canonical_reason().unwrap_or("ok"));
-            }
+            let level = if status.is_server_error() {
+                log::Level::Error
+            } else if status.is_client_error() {
+                log::Level::Warn
+            } else {
+                log::Level::Info
+            };
+            log::log!(level, "{status}");
         }
     }
 }