fix: Performance issue on Messages.countByType aggregation (#30062)

.changeset/brown-clouds-add.md

+---
+"@rocket.chat/meteor": patch
+---
+
+fix: Performance issue on `Messages.countByType` aggregation caused by unindexed property on messages collection

apps/meteor/ee/app/license/server/getStatistics.ts

@@ -101,7 +101,7 @@ async function getEEStatistics(): Promise<EEOnlyStats | undefined> {
 
 	statsPms.push(
 		// Total livechat monitors
-		Users.col.countDocuments({ type: 'livechat-monitor' }).then((count) => {
+		Users.col.countDocuments({ roles: 'livechat-monitor' }).then((count) => {
 			statistics.livechatMonitors = count;
 			return true;
 		}),

apps/meteor/server/models/raw/Messages.ts

@@ -77,6 +77,7 @@ export class MessagesRaw extends BaseRaw<IMessage> implements IMessagesModel {
 			{ key: { 'navigation.token': 1 }, sparse: true },
 
 			{ key: { 'federation.eventId': 1 }, sparse: true },
+			{ key: { t: 1 }, sparse: true },
 		];
 	}