Deduplicate API warnings so they are only logged once

Signed-off-by: Jared Watts <[email protected]>

cmd/crossplane/core/core.go

@@ -20,13 +20,15 @@ package core
 import (
 	"net/http"
 	"net/http/pprof"
+	"os"
 	"path/filepath"
 	"time"
 
 	"github.com/alecthomas/kong"
 	"github.com/google/go-containerregistry/pkg/name"
 	"github.com/spf13/afero"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/leaderelection/resourcelock"
 	ctrl "sigs.k8s.io/controller-runtime"
 
@@ -136,6 +138,11 @@ func (c *startCommand) Run(s *runtime.Scheme, log logging.Logger) error { //noli
 		return errors.Wrap(err, "Cannot get config")
 	}
 
+	cfg.WarningHandler = rest.NewWarningWriter(os.Stderr, rest.WarningWriterOptions{
+		// Warnings from API requests should be deduplicated so they are only logged once
+		Deduplicate: true,
+	})
+
 	mgr, err := ctrl.NewManager(ratelimiter.LimitRESTConfig(cfg, c.MaxReconcileRate), ctrl.Options{
 		Scheme:     s,
 		SyncPeriod: &c.SyncInterval,