Merge branch 'ulan/run-757' into 'master'

RUN-757: Add a metric for total reserved balances

This MR introduces `scheduler_canister_reserved_balance_cycles_total`
similar to the existing `scheduler_canister_balance_cycles_total`.

The metric is recorded in exactly the same way as the existing metric. 

See merge request dfinity-lab/public/ic!14602

rs/execution_environment/src/scheduler.rs

@@ -1545,6 +1545,7 @@ impl Scheduler for SchedulerImpl {
             {
                 let mut cycles_out_sum = Cycles::zero();
                 let mut total_canister_balance = Cycles::zero();
+                let mut total_canister_reserved_balance = Cycles::zero();
                 let mut total_canister_history_memory_usage = NumBytes::new(0);
                 let mut total_canister_memory_usage = NumBytes::new(0);
                 for canister in state.canisters_iter_mut() {
@@ -1576,6 +1577,7 @@ impl Scheduler for SchedulerImpl {
                     total_canister_history_memory_usage += canister.canister_history_memory_usage();
                     total_canister_memory_usage += canister.memory_usage();
                     total_canister_balance += canister.system_state.balance();
+                    total_canister_reserved_balance += canister.system_state.reserved_balance();
                     cycles_out_sum += canister.system_state.queues().output_queue_cycles();
                 }
                 cycles_out_sum += total_canister_balance;
@@ -1584,6 +1586,10 @@ impl Scheduler for SchedulerImpl {
                     .total_canister_balance
                     .set(total_canister_balance.get() as f64);
 
+                self.metrics
+                    .total_canister_reserved_balance
+                    .set(total_canister_reserved_balance.get() as f64);
+
                 // TODO(EXC-1124): Re-enable the check below once it's fixed.
                 //
                 // Check that amount of cycles at the beginning of the round (balances and cycles from input messages) is bigger or equal

rs/execution_environment/src/scheduler/scheduler_metrics.rs

@@ -84,6 +84,7 @@ pub(super) struct SchedulerMetrics {
     pub(super) scheduler_accumulated_priority_deviation: Gauge,
     pub(super) subnet_memory_usage_invariant: IntCounter,
     pub(super) total_canister_balance: Gauge,
+    pub(super) total_canister_reserved_balance: Gauge,
     pub(super) canister_paused_execution: Histogram,
     pub(super) canister_aborted_execution: Histogram,
     pub(super) canister_paused_install_code: Histogram,
@@ -555,6 +556,10 @@ impl SchedulerMetrics {
                 "scheduler_canister_balance_cycles_total",
                 "Total canister balance in Cycles.",
             ),
+            total_canister_reserved_balance: metrics_registry.gauge(
+                "scheduler_canister_reserved_balance_cycles_total",
+                "Total canister reserved balance in Cycles.",
+            ),
             canister_paused_execution: dts_pause_or_abort_histogram(
                 "scheduler_canister_paused_execution",
                 "Number of canisters that have a paused execution.",