Include basic prometheus handlers

disk/src/aggtest.rs

@@ -20,6 +20,7 @@ pub fn make_test_node(id: u32) -> Node {
         }),
         archiver_appliance: None,
         channel_archiver: None,
+        prometheus_api_bind: None,
     }
 }
 

disk/src/gen.rs

@@ -136,6 +136,7 @@ pub async fn gen_test_data() -> Result<(), Error> {
             }),
             archiver_appliance: None,
             channel_archiver: None,
+            prometheus_api_bind: None,
         };
         ensemble.nodes.push(node);
     }