perf(473): Add db address label to reducer queue length (#489)

Closes #473.

crates/core/src/host/module_host.rs

@@ -462,9 +462,10 @@ pub enum InitDatabaseError {
 impl ModuleHost {
     pub fn new(threadpool: Arc<HostThreadpool>, mut module: impl Module) -> Self {
         let info = module.info();
-        let waiter_gauge = WORKER_METRICS
-            .instance_queue_length
-            .with_label_values(&info.identity, &info.module_hash);
+        let waiter_gauge =
+            WORKER_METRICS
+                .instance_queue_length
+                .with_label_values(&info.identity, &info.module_hash, &info.address);
         let instance_pool = LendingPool::new(waiter_gauge);
         instance_pool.add_multiple(module.initial_instances()).unwrap();
         let inner = Arc::new(HostControllerActor {

crates/core/src/worker_metrics/mod.rs

@@ -65,22 +65,8 @@ metrics_group!(
 
         #[name = spacetime_worker_instance_operation_queue_length]
         #[help = "Length of the wait queue for access to a module instance."]
-        #[labels(identity: Identity, module_hash: Hash)]
+        #[labels(identity: Identity, module_hash: Hash, database_address: Address)]
         pub instance_queue_length: IntGaugeVec,
-        // #[name = spacetime_instance_env_delete_pk]
-        // #[help = "Time spent by reducers deleting rows by pk (InstanceEnv::delete_pk)"]
-        // #[labels(database_address, table_id)]
-        // pub instance_env_delete_pk: HistogramVec,
-
-        // #[name = spacetime_instance_env_delete_value]
-        // #[help = "Time spent by reducers deleting rows (InstanceEnv::delete_value)"]
-        // #[labels(database_address, table_id)]
-        // pub instance_env_delete_value: HistogramVec,
-
-        // #[name = spacetime_instance_env_delete_range]
-        // #[help = "Time spent by reducers deleting rows ranges eq (InstanceEnv::delete_range)"]
-        // #[labels(database_address, table_id)]
-        // pub instance_env_delete_range: HistogramVec,
     }
 );