test fix and docs update

Signed-off-by: Attila Mészáros <a_meszaros@apple.com>

Author: csviri

docs/content/en/docs/documentation/operations/configuration.md

@@ -324,6 +324,7 @@ All controller-level keys are prefixed with `josdk.controller.<controller-name>.
 | `josdk.controller.<name>.finalizer` | `String` | Finalizer string added to managed resources |
 | `josdk.controller.<name>.generation-aware` | `Boolean` | Skip reconciliation when the resource generation has not changed |
 | `josdk.controller.<name>.label-selector` | `String` | Label selector to filter watched resources |
+| `josdk.controller.<name>.shard-selector` | `String` | Shard selector to filter watched resources for sharding across operator replicas |
 | `josdk.controller.<name>.max-reconciliation-interval` | `Duration` | Maximum interval between reconciliations even without events |
 | `josdk.controller.<name>.field-manager` | `String` | Field manager name used for SSA operations |
 | `josdk.controller.<name>.trigger-reconciler-on-all-events` | `Boolean` | Trigger reconciliation on every event, not only meaningful changes |
@@ -333,6 +334,7 @@ All controller-level keys are prefixed with `josdk.controller.<controller-name>.
 | Key | Type | Description |
 |---|---|---|
 | `josdk.controller.<name>.informer.label-selector` | `String` | Label selector for the primary resource informer (alias for `label-selector`) |
+| `josdk.controller.<name>.informer.shard-selector` | `String` | Shard selector for the primary resource informer (alias for `shard-selector`) |
 | `josdk.controller.<name>.informer.list-limit` | `Long` | Page size for paginated informer list requests; omit for no pagination |
 
 #### Retry

operator-framework-core/src/test/java/io/javaoperatorsdk/operator/api/config/ControllerConfigurationOverriderTest.java

@@ -181,6 +181,20 @@ void itemStorePreserved() {
     assertNotNull(configuration.getInformerConfig().getItemStore());
   }
 
+  @Test
+  void shardSelectorShouldBePropagated() {
+    var configuration = createConfiguration(new WatchCurrentReconciler());
+    assertNull(configuration.getInformerConfig().getShardSelector());
+
+    final var shardSelector = "shard=1";
+    configuration =
+        ControllerConfigurationOverrider.override(configuration)
+            .withShardSelector(shardSelector)
+            .build();
+
+    assertEquals(shardSelector, configuration.getInformerConfig().getShardSelector());
+  }
+
   @Test
   void configuredDependentShouldNotChangeOnParentOverrideEvenWhenInitialConfigIsSame() {
     var configuration = createConfiguration(new OverriddenNSOnDepReconciler());