feat: cluster Registry extensions

Author: Marek Gruszecki

examples/extensions/cluster_registry/README.md

@@ -0,0 +1,92 @@
+# Extension: Cluster Registry Example
+
+This example demonstrates how to use the Cluster Registry extension together with a cluster provider (Kind in this case) to build a simple multi-cluster controller. The example watches ConfigMaps in any connected cluster and copies them to all the other clusters if they don't already exist.
+
+## Overview
+
+The Cluster Registry extension keeps track of the set of connected cluster names inside the multicluster manager so that your controllers can easily iterate over all clusters.
+
+In this example:
+- The Kind provider discovers all local Kind clusters
+- The Cluster Registry extension maintains their names
+- A controller watches ConfigMaps in every cluster and, when a ConfigMap is created in one cluster, copies it to the other clusters if it doesn't already exist there
+
+Notes/limitations of the demo controller:
+- It only copies newly found ConfigMaps (no updates are propagated)
+- It does not delete ConfigMaps from other clusters when the source is deleted
+- It assumes the target namespaces already exist in the other clusters
+
+## Prerequisites
+
+- Docker running on your machine
+- [Kind](https://kind.sigs.k8s.io/docs/user/quick-start/) installed and available in your PATH
+- `kubectl` configured to access your Kind clusters
+- Go 1.22+ (to run the example)
+
+## Create two Kind clusters
+
+```bash
+kind create cluster --name fleet-alpha
+kind create cluster --name fleet-beta
+```
+
+This will create two clusters with contexts:
+- kind-fleet-alpha
+- kind-fleet-beta
+
+## Run the example
+
+From this directory:
+
+```bash
+go run ./main.go
+```
+
+You should see logs indicating clusters were discovered and a controller started.
+
+## Try it out
+
+Open two terminals and watch events on both clusters:
+
+```bash
+# Terminal 1
+kubectl get events -A --context kind-fleet-alpha --watch
+
+# Terminal 2
+kubectl get events -A --context kind-fleet-beta --watch
+```
+
+Create a ConfigMap in one cluster (for example, fleet-alpha):
+
+```bash
+kubectl --context kind-fleet-alpha -n default create configmap demo --from-literal=hello=world
+```
+
+Observe that the controller logs a reconcile for cluster kind-fleet-alpha and then creates the same ConfigMap in kind-fleet-beta if it doesn't exist yet. You should also see a Normal event recorded for the source ConfigMap.
+
+You can verify the copy with:
+
+```bash
+kubectl --context kind-fleet-beta -n default get configmap demo -o yaml
+```
+
+## How it works (high level)
+
+- The example uses the Kind provider to discover Kind clusters on your machine
+- The Cluster Registry extension registers itself with the manager and exposes the list of cluster names
+- The controller:
+  1. Reconciles ConfigMaps in the cluster where the change happened (the "source")
+  2. Iterates through cluster names from the cluster registry
+  3. For each other cluster (the "targets"), creates the ConfigMap if it doesn't already exist
+
+See main.go for the exact implementation.
+
+## Cleanup
+
+Delete the Kind clusters when done:
+
+```bash
+kind delete cluster --name fleet-alpha
+kind delete cluster --name fleet-beta
+```
+

examples/extensions/cluster_registry/go.mod

@@ -0,0 +1,82 @@
+module sigs.k8s.io/multicluster-runtime/examples/extensions/cluster_registry
+
+go 1.24.0
+
+replace (
+	sigs.k8s.io/multicluster-runtime => ../../..
+)
+
+require (
+	k8s.io/api v0.34.0
+	k8s.io/apimachinery v0.34.0
+	sigs.k8s.io/controller-runtime v0.22.0
+	sigs.k8s.io/multicluster-runtime v0.21.0-alpha.9
+	sigs.k8s.io/multicluster-runtime/providers/kind v0.20.4-alpha.6
+)
+
+require (
+	github.com/BurntSushi/toml v1.4.0 // indirect
+	github.com/alessio/shellescape v1.4.2 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/emicklei/go-restful/v3 v3.12.2 // indirect
+	github.com/evanphx/json-patch/v5 v5.9.11 // indirect
+	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/zapr v1.3.0 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/jsonreference v0.20.2 // indirect
+	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/btree v1.1.3 // indirect
+	github.com/google/gnostic-models v0.7.0 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/google/safetext v0.0.0-20220905092116-b49f7bc46da2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pelletier/go-toml v1.9.5 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_golang v1.22.0 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.62.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/spf13/cobra v1.9.1 // indirect
+	github.com/spf13/pflag v1.0.6 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/net v0.38.0 // indirect
+	golang.org/x/oauth2 v0.27.0 // indirect
+	golang.org/x/sync v0.12.0 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+	golang.org/x/term v0.30.0 // indirect
+	golang.org/x/text v0.23.0 // indirect
+	golang.org/x/time v0.9.0 // indirect
+	gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect
+	google.golang.org/protobuf v1.36.5 // indirect
+	gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/apiextensions-apiserver v0.34.0 // indirect
+	k8s.io/client-go v0.34.0 // indirect
+	k8s.io/klog/v2 v2.130.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20250710124328-f3f2b991d03b // indirect
+	k8s.io/utils v0.0.0-20250604170112-4c0f3b243397 // indirect
+	sigs.k8s.io/json v0.0.0-20241014173422-cfa47c3a1cc8 // indirect
+	sigs.k8s.io/kind v0.26.0 // indirect
+	sigs.k8s.io/randfill v1.0.0 // indirect
+	sigs.k8s.io/structured-merge-diff/v6 v6.3.0 // indirect
+	sigs.k8s.io/yaml v1.6.0 // indirect
+)

examples/extensions/cluster_registry/go.sum

@@ -0,0 +1,122 @@
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