remove useless un-named function on PreFetchHooks

lib/srv/discovery/database_watcher.go

@@ -74,9 +74,7 @@ func (s *Server) startDatabaseWatchers() error {
 			TriggerFetchC:  s.newDiscoveryConfigChangedSub(),
 			Origin:         types.OriginCloud,
 			Clock:          s.clock,
-			PreFetchHookFn: func() {
-				s.databaseWatcherIterationStarted()
-			},
+			PreFetchHookFn: s.databaseWatcherIterationStarted,
 		},
 	)
 	if err != nil {

lib/srv/discovery/discovery.go

@@ -523,9 +523,7 @@ func (s *Server) initAWSWatchers(matchers []types.AWSMatcher) error {
 		s.ctx, s.getAllAWSServerFetchers, s.caRotationCh,
 		server.WithPollInterval(s.PollInterval),
 		server.WithTriggerFetchC(s.newDiscoveryConfigChangedSub()),
-		server.WithPreFetchHookFn(func() {
-			s.ec2WatcherIterationStarted()
-		}),
+		server.WithPreFetchHookFn(s.ec2WatcherIterationStarted),
 	)
 	if err != nil {
 		return trace.Wrap(err)

lib/srv/discovery/kube_integration_watcher.go

@@ -76,9 +76,7 @@ func (s *Server) startKubeIntegrationWatchers() error {
 		Interval:       s.PollInterval,
 		Origin:         types.OriginCloud,
 		TriggerFetchC:  s.newDiscoveryConfigChangedSub(),
-		PreFetchHookFn: func() {
-			s.kubernetesIntegrationWatcherIterationStarted()
-		},
+		PreFetchHookFn: s.kubernetesIntegrationWatcherIterationStarted,
 	})
 	if err != nil {
 		return trace.Wrap(err)

lib/utils/slices/slices.go

@@ -20,7 +20,7 @@ package slices
 
 // FilterMapUnique applies a function to all elements of a slice and collects them.
 // The function returns the value to collect and whether the current element should be included.
-// Returned values are sorted and deduplicated.
+// Returned values are deduplicated.
 func FilterMapUnique[T any, S comparable](ts []T, fn func(T) (s S, include bool)) []S {
 	ss := make([]S, 0, len(ts))
 	seen := make(map[S]struct{}, len(ts))