[CHORE] Go Memberlist debug (chroma-core#1913)

## Description of changes

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
	 - Add some debugs for memberlist in go
 - New functionality
	 - None

## Test plan
*How are these changes tested?*
- [x] Tests pass locally with `pytest` for python, `yarn test` for js,
`cargo test` for rust

## Documentation Changes
*Are all docstrings for user-facing APIs updated if required? Do we need
to make documentation changes in the [docs
repository](https://github.com/chroma-core/docs)?*

go/pkg/coordinator/grpc/server.go

@@ -174,7 +174,7 @@ func NewWithGrpcProvider(config Config, provider grpcutils.GrpcProvider, db *gor
 }
 
 func createMemberlistManager(config Config) (*memberlist_manager.MemberlistManager, error) {
-	log.Info("Starting memberlist manager")
+	log.Info("Creating memberlist manager")
 	memberlist_name := config.WorkerMemberlistName
 	namespace := config.KubernetesNamespace
 	clientset, err := utils.GetKubernetesInterface()

go/pkg/memberlist_manager/memberlist_manager.go

@@ -39,6 +39,7 @@ func NewMemberlistManager(nodeWatcher IWatcher, memberlistStore IMemberlistStore
 }
 
 func (m *MemberlistManager) Start() error {
+	log.Info("Starting memberlist manager")
 	m.nodeWatcher.RegisterCallback(func(nodeIp string) {
 		m.workqueue.Add(nodeIp)
 	})

go/pkg/memberlist_manager/memberlist_store.go

@@ -3,6 +3,8 @@ package memberlist_manager
 import (
 	"context"
 
+	"github.com/pingcap/log"
+	"go.uber.org/zap"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime/schema"
@@ -53,6 +55,7 @@ func (s *CRMemberlistStore) GetMemberlist(ctx context.Context) (return_memberlis
 
 func (s *CRMemberlistStore) UpdateMemberlist(ctx context.Context, memberlist *Memberlist, resourceVersion string) error {
 	gvr := getGvr()
+	log.Info("Updating memberlist store", zap.Any("memberlist", memberlist))
 	unstructured := memberlistToCr(memberlist, s.coordinatorNamespace, s.memberlistCustomResource, resourceVersion)
 	_, err := s.dynamicClient.Resource(gvr).Namespace("chroma").Update(context.TODO(), unstructured, metav1.UpdateOptions{})
 	if err != nil {

go/pkg/memberlist_manager/node_watcher.go

@@ -47,6 +47,7 @@ type KubernetesWatcher struct {
 }
 
 func NewKubernetesWatcher(clientset kubernetes.Interface, coordinator_namespace string, pod_label string, resyncPeriod time.Duration) *KubernetesWatcher {
+	log.Info("Creating new kubernetes watcher", zap.String("namespace", coordinator_namespace), zap.String("pod label", pod_label), zap.Duration("resync period", resyncPeriod))
 	labelSelector := labels.SelectorFromSet(map[string]string{MemberLabel: pod_label})
 	factory := informers.NewSharedInformerFactoryWithOptions(clientset, resyncPeriod, informers.WithNamespace(coordinator_namespace), informers.WithTweakListOptions(func(options *metav1.ListOptions) { options.LabelSelector = labelSelector.String() }))
 	podInformer := factory.Core().V1().Pods().Informer()
@@ -75,6 +76,7 @@ func (w *KubernetesWatcher) Start() error {
 				log.Error("Error while asserting object to pod")
 			}
 			if err == nil {
+				log.Info("Kubernetes Pod Added", zap.String("key", key), zap.String("ip", objPod.Status.PodIP))
 				ip := objPod.Status.PodIP
 				w.mu.Lock()
 				w.ipToKey[ip] = key
@@ -91,6 +93,7 @@ func (w *KubernetesWatcher) Start() error {
 				log.Error("Error while asserting object to pod")
 			}
 			if err == nil {
+				log.Info("Kubernetes Pod Updated", zap.String("key", key), zap.String("ip", objPod.Status.PodIP))
 				ip := objPod.Status.PodIP
 				w.ipToKey[ip] = key
 				w.notify(ip)
@@ -105,6 +108,7 @@ func (w *KubernetesWatcher) Start() error {
 				log.Error("Error while asserting object to pod")
 			}
 			if err == nil {
+				log.Info("Kubernetes Pod Deleted", zap.String("ip", objPod.Status.PodIP))
 				ip := objPod.Status.PodIP
 				// The contract for GetStatus is that if the ip is not in this map, then it returns NotReady
 				delete(w.ipToKey, ip)