Show which registry hives are OK in summary

boot_diags/src/diags.rs

@@ -425,7 +425,17 @@ pub fn parse_registry_hives(
                 diag_group.result = String::from("OK");
                 diag_group.logs.push(Log {
                     label: String::from("Registry"),
-                    summary: Vec::new(),
+                    summary: if hive.is_some() {
+                        vec![DVLine {
+                            line_parts: vec![
+                                format!("Registry ({}): ", hive.unwrap()),
+                                String::from("OK"),
+                            ],
+                            line_colors: vec![Color::Reset, Color::Green],
+                        }]
+                    } else {
+                        Vec::new()
+                    },
                     raw: output_text,
                 });
             } else {