logging: log time taken for tablet initialization only once (#14597)

Signed-off-by: deepthi <[email protected]>

go/vt/vttablet/tabletserver/state_manager.go

@@ -64,6 +64,7 @@ func (state servingState) String() string {
 
 // transitionRetryInterval is for tests.
 var transitionRetryInterval = 1 * time.Second
+var logInitTime sync.Once
 
 // stateManager manages state transition for all the TabletServer
 // subcomponents.
@@ -611,9 +612,9 @@ func (sm *stateManager) setTimeBomb() chan struct{} {
 
 // setState changes the state and logs the event.
 func (sm *stateManager) setState(tabletType topodatapb.TabletType, state servingState) {
-	defer func() {
+	defer logInitTime.Do(func() {
 		log.Infof("Tablet Init took %d ms", time.Since(servenv.GetInitStartTime()).Milliseconds())
-	}()
+	})
 	sm.mu.Lock()
 	defer sm.mu.Unlock()
 	if tabletType == topodatapb.TabletType_UNKNOWN {