fix(admin): classify missing kms config by error variant (#6196)

crates/ecstore/src/bucket/lifecycle/bucket_lifecycle_ops.rs

@@ -1783,7 +1783,7 @@ impl TransitionState {
                                 .await;
                             }
                             global_metrics().record_scanner_transition_failed(1);
-                            if !is_err_version_not_found(&err) && !is_err_object_not_found(&err) && !is_network_or_host_down(&err.to_string(), false) && !err.to_string().contains("use of closed network connection") {
+                            if !is_err_version_not_found(&err) && !is_err_object_not_found(&err) && !is_network_or_host_down(&err.to_string(), false) {
                                 error!(
                                     event = EVENT_LIFECYCLE_TIER_OPERATION_FAILED,
                                     component = LOG_COMPONENT_ECSTORE,

crates/ecstore/src/error/mod.rs

@@ -1116,6 +1116,14 @@ mod tests {
         assert!(encoder_source.is::<reed_solomon_erasure::Error>());
     }
 
+    // The lifecycle transition worker relies on this arm alone to suppress the
+    // closed-connection noise (`bucket_lifecycle_ops.rs`); dropping it here would
+    // silently turn shutdown races back into `error!` log spam.
+    #[test]
+    fn is_network_or_host_down_covers_closed_network_connection() {
+        assert!(is_network_or_host_down("transition failed: use of closed network connection", false));
+    }
+
     // Regression for #952 (ECA-11): an all-`DiskNotFound` slice (every drive in
     // every set unreachable) must NOT be classified as "all not found",
     // otherwise ListObjects silently returns an empty listing and masks a full