feat(yang-push): migrate to yang-rs-5 / libyang 5.4.9, revamp OTEL metrics, refresh example YANG modules

Cargo.toml

@@ -84,6 +84,7 @@ anyhow = { version = "1" }
 serde_with = { version = "3.20" }
 indexmap = { version = "2.14" }
 apache-avro = { version = "0.21" }
+# TODO: clean-up and consolidate towards schema-registry-client
 schema_registry_converter = { version = "4.9", default-features = false }
 rdkafka = { version = "0.39", default-features = false }
 tracing-test = { version = "0.2" }
@@ -102,7 +103,7 @@ sysinfo = { version = "0.39", default-features = false }
 shadow-rs = { version = "2.0", default-features = false }
 smallvec = { version = "1.15" }
 rustc-hash = { version = "2.1" }
-yang4 = { version = "0.1", features = ["bundled"] }
+yang5 = { version = "0.2", features = ["bundled"] }
 tempfile = { version = "3.27" }
 quick-xml = { version = "0.40" }
 russh = { version = "0.61" }

assets/yang/ietf-interfaces/modules/ietf-distributed-notif@2026-04-13.yang

@@ -0,0 +1,127 @@
+module ietf-distributed-notif {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-distributed-notif";
+  prefix dn;
+
+  import ietf-subscribed-notifications {
+    prefix sn;
+    reference
+      "RFC 8639: Subscription to YANG Notifications";
+  }
+  import ietf-yang-push {
+    prefix yp;
+    reference
+      "RFC 8641: Subscription to YANG Notifications for Datastore
+      Updates";
+  }
+
+  organization
+    "IETF NETCONF (Network Configuration) Working Group";
+  contact
+    "WG Web:   <https://datatracker.ietf.org/wg/netconf/>
+     WG List:  <mailto:netconf@ietf.org>
+
+     Authors:  Guangying Zheng
+               <mailto:zhengguangying@huawei.com>
+               Tianran Zhou
+               <mailto:zhoutianran@huawei.com>
+               Thomas Graf
+               <mailto:thomas.graf@swisscom.com>
+               Pierre Francois
+               <mailto:pierre.francois@insa-lyon.fr>
+               Eric Voit
+               <mailto:evoit@cisco.com>";
+  description
+    "Defines augmentation for ietf-subscribed-notifications to
+     enable the distributed publication with single subscription.
+
+     Copyright (c) 2026 IETF Trust and the persons
+     identified as authors of the code.  All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Revised BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (https://trustee.ietf.org/license-info).
+
+     All revisions of IETF and IANA published modules can be found
+     at the YANG Parameters registry
+     (https://www.iana.org/assignments/yang-parameters).
+
+     This version of this YANG module is part of RFC XXXX; see
+     the RFC itself for full legal notices.";
+
+  revision 2026-04-13 {
+    description
+      "Initial version";
+    reference
+      "RFC XXXX: Subscription to Notifications in a Distributed
+       Architecture";
+  }
+
+  grouping message-publisher-id {
+    description
+      "Provides a reusable message-publisher-id leaf.";
+    leaf message-publisher-id {
+      type uint32;
+      config false;
+      description
+        "Identifies the Component software process which publishes
+         notification messages (e.g., processor 1 on line card 1). This
+         field is used to notify the receiver which publisher process
+         published which message. The identifier is locally unique to
+         the Network Node.";
+    }
+  }
+
+  grouping message-publisher-ids {
+    description
+      "Provides a reusable message-publisher-id-list leaf-list.";
+    leaf-list message-publisher-id {
+      type uint32;
+      config false;
+      description
+        "Identifies the Component software process which publishes
+         notification messages (e.g., processor 1 on line card 1). This
+         field is used to notify the receiver which publisher processes
+         are going to publish. The identifiers are locally unique to
+         the Network Node.";
+    }
+  }
+
+  augment "/sn:subscriptions/sn:subscription" {
+    description
+      "This augmentation allows the Message
+       Publisher ID to be exposed for a subscription.";
+    uses message-publisher-ids;
+  }
+
+  augment "/sn:subscription-started" {
+    description
+      "This augmentation adds the Message Publisher ID to the
+       subscription-started subscription change notifications.";
+    uses message-publisher-ids;
+  }
+
+  augment "/sn:subscription-modified" {
+    description
+      "This augmentation adds the Message Publisher ID to the
+       subscription-modified subscription change notifications.";
+    uses message-publisher-ids;
+  }
+
+  augment "/yp:push-update" {
+    description
+      "This augmentation adds the Message Publisher ID in the
+       push-update notification.";
+    uses message-publisher-id;
+  }
+
+  augment "/yp:push-change-update" {
+    description
+      "This augmentation adds the Message Publisher ID in the
+       push-change-update notification.";
+    uses message-publisher-id;
+  }
+}