feat(registry): Added StandardEngineReplicaVersionRecord proto and corresponding key.

rs/protobuf/def/registry/standard_engine_replica_version/v1/standard_engine_replica_version.proto

@@ -0,0 +1,36 @@
+syntax = "proto3";
+package registry.standard_engine_replica_version.v1;
+
+// The default replica/guestos version that engines run, used when an engine's
+// own SubnetRecord.replica_version_id is blank (i.e. the engine has not opted
+// out of the standard upgrade train).
+message StandardEngineReplicaVersionRecord {
+  // In general, these are (hex encoded) git commit IDs from the dfinity/ic
+  // repo, identifying the source code from which Replica was built. (Also known
+  // as Guest OS versions.)
+  string new_replica_version_id = 1;
+  string old_replica_version_id = 2;
+
+  // The (approximate) fraction of engines that should be on
+  // new_replica_version_id (the rest should be on old_replica_version_id).
+  //
+  // Ranges from 0.0 to 1.0 (inclusive).
+  //
+  // Engines with "upgrade priority" <= this should take on
+  // new_replica_version_id. An engine's upgrade priority is a hash whose inputs
+  // include its own subnet_id, and new_replica_version_id. More precisely, an
+  // engine's priority is determined as follows:
+  //
+  // 1. Compute SHA-256 of the concatenation of
+  //    a. len("upgrade priority"): a single u8
+  //    b. "upgrade priority": ASCII encoded
+  //    c. new_replica_version_id: hex decoded
+  //    d. the engine's subnet_id: raw bytes
+  //
+  // 2. Take the first 8 bytes of that hash, and interpret them as a
+  //    little-endian 64 bit unsigned integer.
+  //
+  // 3. Divide that u64 by 2^64 - 1. The result is the engine's upgrade
+  //    priority, a number in [0.0, 1.0].
+  double deployment_progress = 3;
+}

rs/protobuf/generator/src/lib.rs

@@ -282,6 +282,9 @@ fn build_registry_proto(def: &Path, out: &Path) {
         def.join("registry/node_rewards/v2/node_rewards.proto"),
         def.join("registry/dc/v1/dc.proto"),
         def.join("registry/unassigned_nodes_config/v1/unassigned_nodes_config.proto"),
+        def.join(
+            "registry/standard_engine_replica_version/v1/standard_engine_replica_version.proto",
+        ),
     ];
 
     compile_protos(config, def, &registry_files);

rs/protobuf/src/gen/registry/registry.standard_engine_replica_version.v1.rs

@@ -0,0 +1,37 @@
+// This file is @generated by prost-build.
+/// The default replica/guestos version that engines run, used when an engine's
+/// own SubnetRecord.replica_version_id is blank (i.e. the engine has not opted
+/// out of the standard upgrade train).
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct StandardEngineReplicaVersionRecord {
+    /// In general, these are (hex encoded) git commit IDs from the dfinity/ic
+    /// repo, identifying the source code from which Replica was built. (Also known
+    /// as Guest OS versions.)
+    #[prost(string, tag = "1")]
+    pub new_replica_version_id: ::prost::alloc::string::String,
+    #[prost(string, tag = "2")]
+    pub old_replica_version_id: ::prost::alloc::string::String,
+    /// The (approximate) fraction of engines that should be on
+    /// new_replica_version_id (the rest should be on old_replica_version_id).
+    ///
+    /// Ranges from 0.0 to 1.0 (inclusive).
+    ///
+    /// Engines with "upgrade priority" \<= this should take on
+    /// new_replica_version_id. An engine's upgrade priority is a hash whose inputs
+    /// include its own subnet_id, and new_replica_version_id. More precisely, an
+    /// engine's priority is determined as follows:
+    ///
+    /// 1. Compute SHA-256 of the concatenation of
+    ///    a. len("upgrade priority"): a single u8
+    ///    b. "upgrade priority": ASCII encoded
+    ///    c. new_replica_version_id: hex decoded
+    ///    d. the engine's subnet_id: raw bytes
+    ///
+    /// 1. Take the first 8 bytes of that hash, and interpret them as a
+    ///    little-endian 64 bit unsigned integer.
+    ///
+    /// 1. Divide that u64 by 2^64 - 1. The result is the engine's upgrade
+    ///    priority, a number in \[0.0, 1.0\].
+    #[prost(double, tag = "3")]
+    pub deployment_progress: f64,
+}

rs/protobuf/src/registry.rs

@@ -10,5 +10,6 @@ pub mod node_rewards;
 pub mod provisional_whitelist;
 pub mod replica_version;
 pub mod routing_table;
+pub mod standard_engine_replica_version;
 pub mod subnet;
 pub mod unassigned_nodes_config;

rs/protobuf/src/registry/standard_engine_replica_version.rs

@@ -0,0 +1,3 @@
+#[allow(clippy::all)]
+#[path = "../gen/registry/registry.standard_engine_replica_version.v1.rs"]
+pub mod v1;

rs/registry/keys/src/lib.rs

@@ -26,6 +26,7 @@ pub const ROOT_SUBNET_ID_KEY: &str = "nns_subnet_id";
 pub const DEFAULT_INITIAL_DKG_SUBNET_ID_KEY: &str = "default_initial_dkg_subnet_id";
 pub const NODE_REWARDS_TABLE_KEY: &str = "node_rewards_table";
 const UNASSIGNED_NODES_CONFIG_RECORD_KEY: &str = "unassigned_nodes_config";
+const STANDARD_ENGINE_REPLICA_VERSION_RECORD_KEY: &str = "standard_engine_replica_version";
 
 pub const API_BOUNDARY_NODE_RECORD_KEY_PREFIX: &str = "api_boundary_node_";
 pub const NODE_RECORD_KEY_PREFIX: &str = "node_record_";
@@ -92,6 +93,10 @@ pub fn make_unassigned_nodes_config_record_key() -> String {
     UNASSIGNED_NODES_CONFIG_RECORD_KEY.to_string()
 }
 
+pub fn make_standard_engine_replica_version_record_key() -> String {
+    STANDARD_ENGINE_REPLICA_VERSION_RECORD_KEY.to_string()
+}
+
 /// Returns the key whose payload is the [`SubnetId`] of the subnet to which
 /// `SetupInitialDKG` management canister calls are routed by default.
 pub fn make_default_initial_dkg_subnet_id_key() -> String {