MM-59360 add telemetry for paid features related to guests (#28295)

* add telemetry for paid features related to guests

---------

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

server/channels/app/channel.go

@@ -13,6 +13,7 @@ import (
 	"strings"
 
 	"github.com/mattermost/mattermost/server/v8/channels/utils"
+	"github.com/mattermost/mattermost/server/v8/platform/services/telemetry"
 
 	"github.com/mattermost/mattermost/server/public/model"
 	"github.com/mattermost/mattermost/server/public/plugin"
@@ -1568,6 +1569,13 @@ func (a *App) addUserToChannel(c request.CTX, user *model.User, channel *model.C
 		return nil, model.NewAppError("AddUserToChannel", "app.channel_member_history.log_join_event.internal_error", nil, "", http.StatusInternalServerError).Wrap(nErr)
 	}
 
+	if user.IsGuest() {
+		a.Srv().telemetryService.SendTelemetryForFeature(
+			telemetry.TrackGuestFeature,
+			"add_guest_to_channel",
+			map[string]any{"user_actual_id": user.Id})
+	}
+
 	a.Srv().Platform().InvalidateChannelCacheForUser(user.Id)
 	a.invalidateCacheForChannelMembers(channel.Id)
 

server/channels/app/notification.go

@@ -19,6 +19,7 @@ import (
 	"github.com/mattermost/mattermost/server/public/shared/mlog"
 	"github.com/mattermost/mattermost/server/public/shared/request"
 	"github.com/mattermost/mattermost/server/v8/channels/store"
+	"github.com/mattermost/mattermost/server/v8/platform/services/telemetry"
 )
 
 func (a *App) canSendPushNotifications() bool {
@@ -877,6 +878,27 @@ func (a *App) SendNotifications(c request.CTX, post *model.Post, team *model.Tea
 		mlog.String("post_id", post.Id),
 	)
 
+	for id, reason := range mentions.Mentions {
+		user, ok := profileMap[id]
+		if !ok {
+			continue
+		}
+		if user.IsGuest() {
+			if reason == KeywordMention {
+				a.Srv().telemetryService.SendTelemetryForFeature(
+					telemetry.TrackGuestFeature,
+					"post_mentioned_guest",
+					map[string]any{"user_actual_id": user.Id, "post_owner_id": sender.Id},
+				)
+			} else if reason == DMMention {
+				a.Srv().telemetryService.SendTelemetryForFeature(
+					telemetry.TrackGuestFeature,
+					"direct_message_to_guest",
+					map[string]any{"user_actual_id": user.Id, "post_owner_id": sender.Id},
+				)
+			}
+		}
+	}
 	return mentionedUsersList, nil
 }