Adds status sync to shared channels (#28020)

* Adds status sync to shared channels

To allow for status to be synced, this changes add a new type of
shared channel internal task. This task has its contents pre-fetched
and stored in the `existingMsg` property, and it is keyed with a user
ID besides a channel ID, so it doesn't conflict with channel-driven
synchronization tasks.

All status synchronizations are triggered from the app layer, so there
is no need of watching for new WebSocket events. Although right now
we're only syncing one user status per message, the changes account
for a list of statuses in case we want to batch them in the future.

The feature is gated by a configuration property and can be disabled
independently of the rest of Shared Channels if it's necessary. It is
backwards compatible as well, and should cause no problems with
servers running older Mattermost versions.

* Adds status sync error management and retry

* Adds DisableSharedChannelsStatusSync to the telemetry report

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/app_iface.go

@@ -1057,6 +1057,7 @@ type AppIface interface {
 	SaveAcknowledgementForPost(c request.CTX, postID, userID string) (*model.PostAcknowledgement, *model.AppError)
 	SaveAdminNotification(userId string, notifyData *model.NotifyAdminToUpgradeRequest) *model.AppError
 	SaveAdminNotifyData(data *model.NotifyAdminData) (*model.NotifyAdminData, *model.AppError)
+	SaveAndBroadcastStatus(status *model.Status)
 	SaveBrandImage(rctx request.CTX, imageData *multipart.FileHeader) *model.AppError
 	SaveComplianceReport(rctx request.CTX, job *model.Compliance) (*model.Compliance, *model.AppError)
 	SaveReactionForPost(c request.CTX, reaction *model.Reaction) (*model.Reaction, *model.AppError)

server/channels/app/opentracing/opentracing_layer.go

@@ -15305,6 +15305,21 @@ func (a *OpenTracingAppLayer) SaveAdminNotifyData(data *model.NotifyAdminData) (
 	return resultVar0, resultVar1
 }
 
+func (a *OpenTracingAppLayer) SaveAndBroadcastStatus(status *model.Status) {
+	origCtx := a.ctx
+	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.SaveAndBroadcastStatus")
+
+	a.ctx = newCtx
+	a.app.Srv().Store().SetContext(newCtx)
+	defer func() {
+		a.app.Srv().Store().SetContext(origCtx)
+		a.ctx = origCtx
+	}()
+
+	defer span.Finish()
+	a.app.SaveAndBroadcastStatus(status)
+}
+
 func (a *OpenTracingAppLayer) SaveBrandImage(rctx request.CTX, imageData *multipart.FileHeader) *model.AppError {
 	origCtx := a.ctx
 	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.SaveBrandImage")

server/channels/app/platform/shared_channel_service_iface.go

@@ -14,6 +14,7 @@ type SharedChannelServiceIFace interface {
 	Start() error
 	NotifyChannelChanged(channelId string)
 	NotifyUserProfileChanged(userID string)
+	NotifyUserStatusChanged(status *model.Status)
 	SendChannelInvite(channel *model.Channel, userId string, rc *model.RemoteCluster, options ...sharedchannel.InviteOption) error
 	Active() bool
 	InviteRemoteToChannel(channelID, remoteID, userID string, shareIfNotShared bool) error

server/channels/app/platform/status.go

@@ -279,6 +279,9 @@ func (ps *PlatformService) SetStatusLastActivityAt(userID string, activityAt int
 
 	ps.AddStatusCacheSkipClusterSend(status)
 	ps.SetStatusAwayIfNeeded(userID, false)
+	if ps.sharedChannelService != nil {
+		ps.sharedChannelService.NotifyUserStatusChanged(status)
+	}
 }
 
 func (ps *PlatformService) UpdateLastActivityAtIfNeeded(session model.Session) {
@@ -346,6 +349,9 @@ func (ps *PlatformService) SetStatusOnline(userID string, manual bool) {
 				mlog.Error("Failed to save status", mlog.String("user_id", userID), mlog.Err(err), mlog.String("user_id", userID))
 			}
 		}
+		if ps.sharedChannelService != nil {
+			ps.sharedChannelService.NotifyUserStatusChanged(status)
+		}
 	}
 
 	if broadcast {
@@ -366,6 +372,9 @@ func (ps *PlatformService) SetStatusOffline(userID string, manual bool) {
 	status = &model.Status{UserId: userID, Status: model.StatusOffline, Manual: manual, LastActivityAt: model.GetMillis(), ActiveChannel: ""}
 
 	ps.SaveAndBroadcastStatus(status)
+	if ps.sharedChannelService != nil {
+		ps.sharedChannelService.NotifyUserStatusChanged(status)
+	}
 }
 
 func (ps *PlatformService) SetStatusAwayIfNeeded(userID string, manual bool) {
@@ -398,19 +407,22 @@ func (ps *PlatformService) SetStatusAwayIfNeeded(userID string, manual bool) {
 	status.ActiveChannel = ""
 
 	ps.SaveAndBroadcastStatus(status)
+	if ps.sharedChannelService != nil {
+		ps.sharedChannelService.NotifyUserStatusChanged(status)
+	}
 }
 
 // SetStatusDoNotDisturbTimed takes endtime in unix epoch format in UTC
 // and sets status of given userId to dnd which will be restored back after endtime
-func (ps *PlatformService) SetStatusDoNotDisturbTimed(userId string, endtime int64) {
+func (ps *PlatformService) SetStatusDoNotDisturbTimed(userID string, endtime int64) {
 	if !*ps.Config().ServiceSettings.EnableUserStatuses {
 		return
 	}
 
-	status, err := ps.GetStatus(userId)
+	status, err := ps.GetStatus(userID)
 
 	if err != nil {
-		status = &model.Status{UserId: userId, Status: model.StatusOffline, Manual: false, LastActivityAt: 0, ActiveChannel: ""}
+		status = &model.Status{UserId: userID, Status: model.StatusOffline, Manual: false, LastActivityAt: 0, ActiveChannel: ""}
 	}
 
 	status.PrevStatus = status.Status
@@ -420,6 +432,9 @@ func (ps *PlatformService) SetStatusDoNotDisturbTimed(userId string, endtime int
 	status.DNDEndTime = endtime
 
 	ps.SaveAndBroadcastStatus(status)
+	if ps.sharedChannelService != nil {
+		ps.sharedChannelService.NotifyUserStatusChanged(status)
+	}
 }
 
 func (ps *PlatformService) SetStatusDoNotDisturb(userID string) {
@@ -437,6 +452,9 @@ func (ps *PlatformService) SetStatusDoNotDisturb(userID string) {
 	status.Manual = true
 
 	ps.SaveAndBroadcastStatus(status)
+	if ps.sharedChannelService != nil {
+		ps.sharedChannelService.NotifyUserStatusChanged(status)
+	}
 }
 
 func (ps *PlatformService) SetStatusOutOfOffice(userID string) {
@@ -454,6 +472,9 @@ func (ps *PlatformService) SetStatusOutOfOffice(userID string) {
 	status.Manual = true
 
 	ps.SaveAndBroadcastStatus(status)
+	if ps.sharedChannelService != nil {
+		ps.sharedChannelService.NotifyUserStatusChanged(status)
+	}
 }
 
 func (ps *PlatformService) isUserAway(lastActivityAt int64) bool {

server/channels/app/shared_channel.go

@@ -19,7 +19,7 @@ import (
 func (a *App) getSharedChannelsService() (SharedChannelServiceIFace, error) {
 	scService := a.Srv().GetSharedChannelSyncService()
 	if scService == nil || !scService.Active() {
-		return nil, model.NewAppError("InviteRemoteToChannel", "api.command_share.service_disabled",
+		return nil, model.NewAppError("getSharedChannelsService", "api.command_share.service_disabled",
 			nil, "", http.StatusBadRequest)
 	}
 	return scService, nil

server/channels/app/shared_channel_service_iface.go

@@ -15,6 +15,7 @@ type SharedChannelServiceIFace interface {
 	Start() error
 	NotifyChannelChanged(channelId string)
 	NotifyUserProfileChanged(userID string)
+	NotifyUserStatusChanged(status *model.Status)
 	SendChannelInvite(channel *model.Channel, userId string, rc *model.RemoteCluster, options ...sharedchannel.InviteOption) error
 	Active() bool
 	InviteRemoteToChannel(channelID, remoteID, userID string, shareIfNotShared bool) error

server/channels/app/status.go

@@ -50,6 +50,10 @@ func (a *App) SetStatusOutOfOffice(userID string) {
 	a.Srv().Platform().SetStatusOutOfOffice(userID)
 }
 
+func (a *App) SaveAndBroadcastStatus(status *model.Status) {
+	a.Srv().Platform().SaveAndBroadcastStatus(status)
+}
+
 func (a *App) GetStatusFromCache(userID string) *model.Status {
 	return a.Srv().Platform().GetStatusFromCache(userID)
 }
@@ -66,9 +70,14 @@ func (a *App) UpdateDNDStatusOfUsers() {
 		mlog.Warn("Failed to fetch dnd statues from store", mlog.String("err", err.Error()))
 		return
 	}
+
+	scs, _ := a.getSharedChannelsService()
 	for i := range statuses {
 		a.Srv().Platform().AddStatusCache(statuses[i])
 		a.Srv().Platform().BroadcastStatus(statuses[i])
+		if scs != nil {
+			scs.NotifyUserStatusChanged(statuses[i])
+		}
 	}
 }
 

server/platform/services/sharedchannel/mock_AppIface_test.go

@@ -474,6 +474,11 @@ func (_m *MockAppIface) Publish(message *model.WebSocketEvent) {
 	_m.Called(message)
 }
 
+// SaveAndBroadcastStatus provides a mock function with given fields: status
+func (_m *MockAppIface) SaveAndBroadcastStatus(status *model.Status) {
+	_m.Called(status)
+}
+
 // SaveReactionForPost provides a mock function with given fields: c, reaction
 func (_m *MockAppIface) SaveReactionForPost(c request.CTX, reaction *model.Reaction) (*model.Reaction, *model.AppError) {
 	ret := _m.Called(c, reaction)

server/platform/services/sharedchannel/service.go

@@ -62,6 +62,7 @@ type AppIface interface {
 	DeletePost(c request.CTX, postID, deleteByID string) (*model.Post, *model.AppError)
 	SaveReactionForPost(c request.CTX, reaction *model.Reaction) (*model.Reaction, *model.AppError)
 	DeleteReactionForPost(c request.CTX, reaction *model.Reaction) *model.AppError
+	SaveAndBroadcastStatus(status *model.Status)
 	PatchChannelModerationsForChannel(c request.CTX, channel *model.Channel, channelModerationsPatch []*model.ChannelModerationPatch) ([]*model.ChannelModeration, *model.AppError)
 	CreateUploadSession(c request.CTX, us *model.UploadSession) (*model.UploadSession, *model.AppError)
 	FileReader(path string) (filestore.ReadCloseSeeker, *model.AppError)

server/platform/services/sharedchannel/sync_recv.go

@@ -65,6 +65,7 @@ func (scs *Service) processSyncMessage(c request.CTX, syncMsg *model.SyncMsg, rc
 		mlog.Int("user_count", len(syncMsg.Users)),
 		mlog.Int("post_count", len(syncMsg.Posts)),
 		mlog.Int("reaction_count", len(syncMsg.Reactions)),
+		mlog.Int("status_count", len(syncMsg.Statuses)),
 	)
 
 	if targetChannel, err = scs.server.GetStore().Channel().Get(syncMsg.ChannelId, true); err != nil {
@@ -175,6 +176,10 @@ func (scs *Service) processSyncMessage(c request.CTX, syncMsg *model.SyncMsg, rc
 		}
 	}
 
+	for _, status := range syncMsg.Statuses {
+		scs.app.SaveAndBroadcastStatus(status)
+	}
+
 	response.SetPayload(syncResp)
 
 	return nil

server/platform/services/sharedchannel/sync_send.go

@@ -16,27 +16,35 @@ import (
 )
 
 type syncTask struct {
-	id         string
-	channelID  string
-	remoteID   string
-	AddedAt    time.Time
-	retryCount int
-	retryMsg   *model.SyncMsg
-	schedule   time.Time
+	id        string
+	channelID string
+	userID    string
+	remoteID  string
+	AddedAt   time.Time
+	// existingMsg is used to add information to the task on creation
+	// instead of waiting until the task is processed to fetch it. If
+	// a new task with the same ID is scheduled, its existingMsg will
+	// replace the previous one
+	existingMsg *model.SyncMsg
+	retryCount  int
+	retryMsg    *model.SyncMsg
+	schedule    time.Time
 }
 
-func newSyncTask(channelID string, remoteID string, retryMsg *model.SyncMsg) syncTask {
+func newSyncTask(channelID, userID string, remoteID string, existingMsg, retryMsg *model.SyncMsg) syncTask {
 	var retryID string
 	if retryMsg != nil {
 		retryID = retryMsg.Id
 	}
 
 	return syncTask{
-		id:        channelID + remoteID + retryID, // combination of ids to avoid duplicates
-		channelID: channelID,
-		remoteID:  remoteID, // empty means update all remote clusters
-		retryMsg:  retryMsg,
-		schedule:  time.Now(),
+		id:          channelID + userID + remoteID + retryID, // combination of ids to avoid duplicates
+		channelID:   channelID,
+		userID:      userID,
+		remoteID:    remoteID, // empty means update all remote clusters
+		existingMsg: existingMsg,
+		retryMsg:    retryMsg,
+		schedule:    time.Now(),
 	}
 }
 
@@ -53,13 +61,13 @@ func (scs *Service) NotifyChannelChanged(channelID string) {
 		return
 	}
 
-	task := newSyncTask(channelID, "", nil)
+	task := newSyncTask(channelID, "", "", nil, nil)
 	task.schedule = time.Now().Add(NotifyMinimumDelay)
 	scs.addTask(task)
 }
 
-// NotifyUserProfileChanged is called to indicate that a user belonging to at least one
-// shared channel has modified their user profile (name, username, email, custom status, profile image)
+// NotifyUserProfileChanged is called to indicate that a user has modified their user
+// profile (name, username, email, custom status, profile image)
 func (scs *Service) NotifyUserProfileChanged(userID string) {
 	if rcs := scs.server.GetRemoteClusterService(); rcs == nil {
 		return
@@ -80,15 +88,63 @@ func (scs *Service) NotifyUserProfileChanged(userID string) {
 	notified := make(map[string]struct{})
 
 	for _, user := range scusers {
-		// update every channel + remote combination they belong to.
+		// update every user + remote combination they belong to.
 		// Redundant updates (ie. to same remote for multiple channels) will be
 		// filtered out.
-		combo := user.ChannelId + user.RemoteId
+
+		combo := user.UserId + user.RemoteId
 		if _, ok := notified[combo]; ok {
 			continue
 		}
 		notified[combo] = struct{}{}
-		task := newSyncTask(user.ChannelId, user.RemoteId, nil)
+		task := newSyncTask(user.ChannelId, "", user.RemoteId, nil, nil)
+		task.schedule = time.Now().Add(NotifyMinimumDelay)
+		scs.addTask(task)
+	}
+}
+
+// NotifyUserStatusChanged is called to indicate that a user has modified their status
+func (scs *Service) NotifyUserStatusChanged(status *model.Status) {
+	if rcs := scs.server.GetRemoteClusterService(); rcs == nil {
+		return
+	}
+
+	if *scs.server.Config().ConnectedWorkspacesSettings.DisableSharedChannelsStatusSync {
+		return
+	}
+
+	if status.UserId == "" {
+		scs.server.Log().Log(mlog.LvlSharedChannelServiceError, "Received invalid status for sync",
+			mlog.String("userID", status.UserId),
+		)
+		return
+	}
+
+	scusers, err := scs.server.GetStore().SharedChannel().GetUsersForUser(status.UserId)
+	if err != nil {
+		scs.server.Log().Log(mlog.LvlSharedChannelServiceError, "Failed to fetch shared channel users",
+			mlog.String("userID", status.UserId),
+			mlog.Err(err),
+		)
+		return
+	}
+	if len(scusers) == 0 {
+		return
+	}
+
+	existingMsg := &model.SyncMsg{Statuses: []*model.Status{status}}
+	notified := make(map[string]struct{})
+
+	for _, user := range scusers {
+		// update every user + remote combination they belong to.
+		// Redundant updates (ie. to same remote for multiple channels) will be
+		// filtered out.
+		combo := user.UserId + user.RemoteId
+		if _, ok := notified[combo]; ok {
+			continue
+		}
+		notified[combo] = struct{}{}
+		task := newSyncTask(user.ChannelId, user.UserId, user.RemoteId, existingMsg, nil)
 		task.schedule = time.Now().Add(NotifyMinimumDelay)
 		scs.addTask(task)
 	}
@@ -115,7 +171,7 @@ func (scs *Service) ForceSyncForRemote(rc *model.RemoteCluster) {
 	}
 
 	for _, scr := range scrs {
-		task := newSyncTask(scr.ChannelId, rc.RemoteId, nil)
+		task := newSyncTask(scr.ChannelId, "", rc.RemoteId, nil, nil)
 		task.schedule = time.Now().Add(NotifyMinimumDelay)
 		scs.addTask(task)
 	}
@@ -125,7 +181,12 @@ func (scs *Service) ForceSyncForRemote(rc *model.RemoteCluster) {
 func (scs *Service) addTask(task syncTask) {
 	task.AddedAt = time.Now()
 	scs.mux.Lock()
-	if _, ok := scs.tasks[task.id]; !ok {
+	if originalTask, ok := scs.tasks[task.id]; ok {
+		// if the task was already scheduled, we only update the
+		// existingMsg in case there is new information
+		originalTask.existingMsg = task.existingMsg
+		scs.tasks[task.id] = originalTask
+	} else {
 		scs.tasks[task.id] = task
 	}
 	scs.mux.Unlock()
@@ -327,6 +388,7 @@ func (scs *Service) handlePostError(postId string, task syncTask, rc *model.Remo
 		scs.server.Log().Log(mlog.LvlSharedChannelServiceError, "error fetching post for sync retry",
 			mlog.String("remote", rc.DisplayName),
 			mlog.String("post_id", postId),
+			mlog.Err(err),
 		)
 		return
 	}
@@ -334,7 +396,38 @@ func (scs *Service) handlePostError(postId string, task syncTask, rc *model.Remo
 	syncMsg := model.NewSyncMsg(task.channelID)
 	syncMsg.Posts = []*model.Post{post}
 
-	scs.addTask(newSyncTask(task.channelID, task.remoteID, syncMsg))
+	scs.addTask(newSyncTask(task.channelID, task.userID, task.remoteID, nil, syncMsg))
+}
+
+func (scs *Service) handleStatusError(userId string, task syncTask, rc *model.RemoteCluster) {
+	if task.retryMsg != nil && len(task.retryMsg.Statuses) == 1 && task.retryMsg.Statuses[0].UserId == userId {
+		// this was a retry for specific status that failed previously. Try again if within MaxRetries.
+		if task.incRetry() {
+			scs.addTask(task)
+		} else {
+			scs.server.Log().Log(mlog.LvlSharedChannelServiceError, "error syncing status",
+				mlog.String("remote", rc.DisplayName),
+				mlog.String("user_id", userId),
+			)
+		}
+		return
+	}
+
+	// this status failed as part of a group of statuses. Retry as an individual status.
+	status, err := scs.server.GetStore().Status().Get(userId)
+	if err != nil {
+		scs.server.Log().Log(mlog.LvlSharedChannelServiceError, "error fetching status for sync retry",
+			mlog.String("remote", rc.DisplayName),
+			mlog.String("user_id", userId),
+			mlog.Err(err),
+		)
+		return
+	}
+
+	syncMsg := model.NewSyncMsg(task.channelID)
+	syncMsg.Statuses = []*model.Status{status}
+
+	scs.addTask(newSyncTask(task.channelID, task.userID, task.remoteID, nil, syncMsg))
 }
 
 // notifyRemoteOffline creates an ephemeral post to the author for any posts created recently to remotes

server/platform/services/sharedchannel/sync_send_remote.go

@@ -35,6 +35,7 @@ type syncData struct {
 	profileImages map[string]*model.User
 	posts         []*model.Post
 	reactions     []*model.Reaction
+	statuses      []*model.Status
 	attachments   []attachment
 
 	resultRepeat     bool
@@ -68,6 +69,13 @@ func (sd *syncData) isCursorChanged() bool {
 		sd.scr.LastPostUpdateAt != sd.resultNextCursor.LastPostUpdateAt || sd.scr.LastPostUpdateID != sd.resultNextCursor.LastPostUpdateID
 }
 
+func (sd *syncData) setDataFromMsg(msg *model.SyncMsg) {
+	sd.users = msg.Users
+	sd.posts = msg.Posts
+	sd.reactions = msg.Reactions
+	sd.statuses = msg.Statuses
+}
+
 // syncForRemote updates a remote cluster with any new posts/reactions for a specific
 // channel. If many changes are found, only the oldest X changes are sent and the channel
 // is re-added to the task map. This ensures no channels are starved for updates even if some
@@ -115,21 +123,30 @@ func (scs *Service) syncForRemote(task syncTask, rc *model.RemoteCluster) error
 		return err
 	}
 
+	sd := newSyncData(task, rc, scr)
+
 	// if this is retrying a failed msg, just send it again.
 	if task.retryMsg != nil {
-		sd := newSyncData(task, rc, scr)
-		sd.users = task.retryMsg.Users
-		sd.posts = task.retryMsg.Posts
-		sd.reactions = task.retryMsg.Reactions
+		sd.setDataFromMsg(task.retryMsg)
 		return scs.sendSyncData(sd)
 	}
 
-	sd := newSyncData(task, rc, scr)
+	// if this has an already existing msg, just send it right away
+	if task.existingMsg != nil {
+		sd.setDataFromMsg(task.existingMsg)
+		return scs.sendSyncData(sd)
+	}
+
+	// if we don't have a channelID at this point, we cannot fetch new
+	// data from the database
+	if task.channelID == "" {
+		return fmt.Errorf("task doesn't have prefetched data nor a channel ID set")
+	}
 
 	// schedule another sync if the repeat flag is set at some point.
 	defer func(rpt *bool) {
 		if *rpt {
-			scs.addTask(newSyncTask(task.channelID, task.remoteID, nil))
+			scs.addTask(newSyncTask(task.channelID, task.userID, task.remoteID, nil, nil))
 		}
 	}(&sd.resultRepeat)
 
@@ -516,6 +533,13 @@ func (scs *Service) sendSyncData(sd *syncData) error {
 		}
 	}
 
+	// send statuses
+	if len(sd.statuses) != 0 {
+		if err := scs.sendStatusSyncData(sd); err != nil {
+			merr.Append(fmt.Errorf("cannot send status sync data: %w", err))
+		}
+	}
+
 	// send user profile images
 	if len(sd.profileImages) != 0 {
 		scs.sendProfileImageSyncData(sd)
@@ -624,6 +648,25 @@ func (scs *Service) sendReactionSyncData(sd *syncData) error {
 	})
 }
 
+// sendStatusSyncData sends the collected status updates to the remote cluster.
+func (scs *Service) sendStatusSyncData(sd *syncData) error {
+	msg := model.NewSyncMsg(sd.task.channelID)
+	msg.Statuses = sd.statuses
+
+	return scs.sendSyncMsgToRemote(msg, sd.rc, func(syncResp model.SyncResponse, errResp error) {
+		if len(syncResp.StatusErrors) != 0 {
+			scs.server.Log().Log(mlog.LvlSharedChannelServiceError, "Response indicates error from status(es) sync",
+				mlog.String("remote_id", sd.rc.RemoteId),
+				mlog.Array("user_ids", syncResp.StatusErrors),
+			)
+
+			for _, userID := range syncResp.StatusErrors {
+				scs.handleStatusError(userID, sd.task, sd.rc)
+			}
+		}
+	})
+}
+
 // sendProfileImageSyncData sends the collected user profile image updates to the remote cluster.
 func (scs *Service) sendProfileImageSyncData(sd *syncData) {
 	for _, user := range sd.profileImages {

server/platform/services/telemetry/telemetry.go

@@ -891,8 +891,9 @@ func (ts *TelemetryService) trackConfig() {
 	})
 
 	ts.SendTelemetry(TrackConfigConnectedWorkspaces, map[string]any{
-		"enable_shared_channels":        *cfg.ConnectedWorkspacesSettings.EnableSharedChannels,
-		"enable_remote_cluster_service": *cfg.ConnectedWorkspacesSettings.EnableRemoteClusterService && cfg.FeatureFlags.EnableRemoteClusterService,
+		"enable_shared_channels":              *cfg.ConnectedWorkspacesSettings.EnableSharedChannels,
+		"enable_remote_cluster_service":       *cfg.ConnectedWorkspacesSettings.EnableRemoteClusterService && cfg.FeatureFlags.EnableRemoteClusterService,
+		"disable_shared_channels_status_sync": *cfg.ConnectedWorkspacesSettings.DisableSharedChannelsStatusSync,
 	})
 
 	// Convert feature flags to map[string]any for sending

server/public/model/config.go

@@ -3243,8 +3243,9 @@ func (w *WranglerSettings) IsValid() *AppError {
 }
 
 type ConnectedWorkspacesSettings struct {
-	EnableSharedChannels       *bool
-	EnableRemoteClusterService *bool
+	EnableSharedChannels            *bool
+	EnableRemoteClusterService      *bool
+	DisableSharedChannelsStatusSync *bool
 }
 
 func (c *ConnectedWorkspacesSettings) SetDefaults(isUpdate bool, e ExperimentalSettings) {
@@ -3263,6 +3264,10 @@ func (c *ConnectedWorkspacesSettings) SetDefaults(isUpdate bool, e ExperimentalS
 			c.EnableRemoteClusterService = NewPointer(false)
 		}
 	}
+
+	if c.DisableSharedChannelsStatusSync == nil {
+		c.DisableSharedChannelsStatusSync = NewPointer(false)
+	}
 }
 
 type GlobalRelayMessageExportSettings struct {

server/public/model/shared_channel.go

@@ -275,6 +275,7 @@ type SyncMsg struct {
 	Users     map[string]*User `json:"users,omitempty"`
 	Posts     []*Post          `json:"posts,omitempty"`
 	Reactions []*Reaction      `json:"reactions,omitempty"`
+	Statuses  []*Status        `json:"statuses,omitempty"`
 }
 
 func NewSyncMsg(channelID string) *SyncMsg {
@@ -311,6 +312,8 @@ type SyncResponse struct {
 
 	ReactionsLastUpdateAt int64    `json:"reactions_last_update_at"`
 	ReactionErrors        []string `json:"reaction_errors"`
+
+	StatusErrors []string `json:"status_errors"` // user IDs for which the status sync failed
 }
 
 // RegisterPluginOpts is passed by plugins to the `RegisterPluginForSharedChannels` plugin API