Specify the resource reservation mechanism

spec/_attachments/ic.did

@@ -6,13 +6,15 @@ type canister_settings = record {
   compute_allocation : opt nat;
   memory_allocation : opt nat;
   freezing_threshold : opt nat;
+  reserved_cycles_limit : opt nat;
 };
 
 type definite_canister_settings = record {
   controllers : vec principal;
   compute_allocation : nat;
   memory_allocation : nat;
   freezing_threshold : nat;
+  reserved_cycles_limit : nat;
 };
 
 type change_origin = variant {
@@ -176,6 +178,7 @@ service ic : {
       memory_size: nat;
       cycles: nat;
       idle_cycles_burned_per_day: nat;
+      reserved_cycles: nat;
   });
   canister_info : (record {
       canister_id : canister_id;

spec/_attachments/interface-spec-changelog.md

@@ -6,6 +6,7 @@
 * Stop canister calls might be rejected upon timeout.
 * The IC sends a `user-agent` header with the value `ic/1.0` in canister HTTPS outcalls if the canister does not provide one.
 * Add a management canister method for retrieving node metrics.
+* Specify the resource reservation mechanism.
 
 ### 0.22.0 (2023-11-15) {#0_22_0}
 * Add metrics on subnet usage into the certified state tree and a new HTTP endpoint `/api/v2/subnet/<subnet_id>/read_state` for retrieving them.