[nexus] fail instances if the sled they're on isn't...on

nexus/db-model/src/sled.rs

@@ -121,6 +121,10 @@ impl Sled {
         &self.serial_number
     }
 
+    pub fn revision(&self) -> u32 {
+        self.revision.into()
+    }
+
     pub fn part_number(&self) -> &str {
         &self.part_number
     }

nexus/db-queries/src/db/datastore/mod.rs

@@ -129,7 +129,7 @@ mod silo;
 mod silo_auth_settings;
 mod silo_group;
 mod silo_user;
-mod sled;
+pub mod sled;
 mod sled_instance;
 mod snapshot;
 mod ssh_key;

nexus/src/app/background/init.rs

@@ -790,6 +790,8 @@ impl BackgroundTasksInitializer {
                 datastore.clone(),
                 sagas.clone(),
                 producer_registry,
+                resolver.clone(),
+                inventory_load_watcher.clone(),
                 instance_watcher::WatcherIdentity { nexus_id, rack_id },
             );
             driver.register(TaskDefinition {