Preserve MSRV-compatible atomic router metrics on current Rust

crates/graphql-orm-router/CHANGELOG.md

@@ -10,6 +10,13 @@ supersedes: []
 
 # Changelog
 
+## 0.5.4 - 2026-10-01
+
+- Replace the deprecated atomic `fetch_update` in saturating metrics decrements
+  with an equivalent compare-exchange loop supported by Rust 1.90. Preserve
+  relaxed ordering and saturation while allowing warnings-denied builds on
+  current Rust. Public APIs, counters and router behavior remain unchanged.
+
 ## 0.5.3 - 2026-09-27
 
 - Updated the private Hive runtime from 0.0.87 to published 0.2.19, including

crates/graphql-orm-router/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "graphql-orm-router"
-version = "0.5.3"
+version = "0.5.4"
 edition = "2024"
 rust-version = "1.90"
 description = "Federated GraphQL router for graphql-orm and project-neutral subgraphs"

crates/graphql-orm-router/MIGRATION.md

@@ -10,6 +10,12 @@ supersedes: []
 
 # graphql-orm-router migration guide
 
+## 0.5.3 to 0.5.4
+
+No code, configuration or stored-data migration is needed. Rebuild to retain
+warnings-denied compilation on current Rust without raising the Rust 1.90 MSRV.
+Metrics preserve their atomic saturating decrement and relaxed ordering.
+
 ## Workspace release dependency alignment
 
 For workspace releases selecting `agql-auth` v0.19.1, direct consumers must use

crates/graphql-orm-router/README.md

@@ -26,7 +26,7 @@ This unpublished package is Git-only:
 
 ```toml
 [dependencies]
-graphql-orm-router = { git = "https://github.com/Dastari/graphql-orm.git", rev = "<reviewed-full-40-character-commit-sha>", version = "0.5.3" }
+graphql-orm-router = { git = "https://github.com/Dastari/graphql-orm.git", rev = "<reviewed-full-40-character-commit-sha>", version = "0.5.4" }
 ```
 
 Enable `auth-agql` only when adapting a separately configured

crates/graphql-orm-router/src/metrics.rs

@@ -232,9 +232,20 @@ impl RouterMetrics {
 }
 
 fn decrement(counter: &AtomicUsize, count: usize) {
-    let _ = counter.fetch_update(Ordering::Relaxed, Ordering::Relaxed, |current| {
-        Some(current.saturating_sub(count))
-    });
+    // Keep the atomic saturating update compatible with the Rust 1.90 MSRV;
+    // current Rust deprecates fetch_update in favor of the newer try_update.
+    let mut current = counter.load(Ordering::Relaxed);
+    loop {
+        match counter.compare_exchange_weak(
+            current,
+            current.saturating_sub(count),
+            Ordering::Relaxed,
+            Ordering::Relaxed,
+        ) {
+            Ok(_) => break,
+            Err(observed) => current = observed,
+        }
+    }
 }
 
 #[cfg(test)]

docs/reference/workspace-packages.md

@@ -24,7 +24,7 @@ changes.
 | `graphql-orm-backup` | `0.7.2` | `crates/graphql-orm-backup` | `local` | `graphql-orm` (optional), `graphql-orm-storage` |
 | `graphql-orm-macros` | `0.35.2` | `crates/graphql-orm-macros` | `sqlite` | none |
 | `graphql-orm-operation-catalog` | `0.4.0` | `crates/graphql-orm-operation-catalog` | none | `graphql-orm-router-protocol` (optional) |
-| `graphql-orm-router` | `0.5.3` | `crates/graphql-orm-router` | none | `graphql-orm-router-protocol` |
+| `graphql-orm-router` | `0.5.4` | `crates/graphql-orm-router` | none | `graphql-orm-router-protocol` |
 | `graphql-orm-router-protocol` | `0.2.1` | `crates/graphql-orm-router-protocol` | none | none |
 | `graphql-orm-storage` | `0.6.2` | `crates/graphql-orm-storage` | `local` | none |