Warn pods not starting (#493)

Print warning event related to mizu k8s resources.
In non-daemon print to CLI. In Daemon print to API-Server logs.

shared/kubernetes/eventWatchHelper.go

@@ -0,0 +1,45 @@
+package kubernetes
+
+import (
+	"context"
+	"regexp"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/watch"
+)
+
+type EventWatchHelper struct {
+	kubernetesProvider *Provider
+	NameRegexFilter *regexp.Regexp
+}
+
+func NewEventWatchHelper(kubernetesProvider *Provider, NameRegexFilter *regexp.Regexp) *EventWatchHelper {
+	return &EventWatchHelper{
+		kubernetesProvider: kubernetesProvider,
+		NameRegexFilter: NameRegexFilter,
+	}
+}
+
+// Implements the EventFilterer Interface
+func (wh *EventWatchHelper) Filter(wEvent *WatchEvent) (bool, error) {
+	event, err := wEvent.ToEvent()
+	if err != nil {
+		return false, nil
+	}
+
+	if !wh.NameRegexFilter.MatchString(event.Name) {
+		return false, nil
+	}
+
+	return true, nil
+}
+
+// Implements the WatchCreator Interface
+func (wh *EventWatchHelper) NewWatcher(ctx context.Context, namespace string) (watch.Interface, error) {
+	watcher, err := wh.kubernetesProvider.clientSet.EventsV1().Events(namespace).Watch(ctx, metav1.ListOptions{Watch: true})
+	if err != nil {
+		return nil, err
+	}
+
+	return watcher, nil
+}