Rate limiting got a lot more aggresive.

matrix-org/synapse#13018

Rate limiting in Synapse used to reset the burst count and remove
the backoff when you were spamming continuously, now it doesn't.
Ideally we'd rewrite the rate limiting logic to back off for longer
than suggested so we could get burst again, but for now
lets just unblock CI by reducing the number of events we send in these
tests.

test/integration/throttleTest.ts

@@ -9,12 +9,12 @@ describe("Test: throttled users can function with Mjolnir.", function () {
         let throttledUserId = await throttledUser.getUserId();
         let targetRoom = await throttledUser.createRoom();
         // send enough messages to hit the rate limit.
-        await Promise.all([...Array(150).keys()].map((i) => throttledUser.sendMessage(targetRoom, {msgtype: 'm.text.', body: `Message #${i}`})));
+        await Promise.all([...Array(25).keys()].map((i) => throttledUser.sendMessage(targetRoom, {msgtype: 'm.text.', body: `Message #${i}`})));
         let messageCount = 0;
-        await getMessagesByUserIn(throttledUser, throttledUserId, targetRoom, 150, (events) => {
+        await getMessagesByUserIn(throttledUser, throttledUserId, targetRoom, 25, (events) => {
             messageCount += events.length;
         });
-        assert.equal(messageCount, 150, "There should have been 150 messages in this room");
+        assert.equal(messageCount, 25, "There should have been 25 messages in this room");
     })
 })
 
@@ -43,12 +43,12 @@ describe("Test: Mjolnir can still sync and respond to commands while throttled",
         await badUser.joinRoom(targetRoom);
 
         // Give Mjolnir some work to do and some messages to sync through.
-        await Promise.all([...Array(100).keys()].map((i) => moderator.sendMessage(this.mjolnir.managementRoomId, {msgtype: 'm.text.', body: `Irrelevant Message #${i}`})));
-        await Promise.all([...Array(50).keys()].map(_ => moderator.sendMessage(this.mjolnir.managementRoomId, {msgtype: 'm.text', body: '!mjolnir status'})));
+        await Promise.all([...Array(25).keys()].map((i) => moderator.sendMessage(this.mjolnir.managementRoomId, {msgtype: 'm.text.', body: `Irrelevant Message #${i}`})));
+        await Promise.all([...Array(25).keys()].map(_ => moderator.sendMessage(this.mjolnir.managementRoomId, {msgtype: 'm.text', body: '!mjolnir status'})));
 
         await moderator.sendMessage(this.mjolnir.managementRoomId, {msgtype: 'm.text', body: `!mjolnir rooms add ${targetRoom}`});
 
-        await Promise.all([...Array(50).keys()].map((i) => badUser.sendMessage(targetRoom, {msgtype: 'm.text.', body: `Bad Message #${i}`})));
+        await Promise.all([...Array(25).keys()].map((i) => badUser.sendMessage(targetRoom, {msgtype: 'm.text.', body: `Bad Message #${i}`})));
 
         try {
             await moderator.start();
@@ -70,6 +70,6 @@ describe("Test: Mjolnir can still sync and respond to commands while throttled",
                 }
             })
         });
-        assert.equal(count, 51, "There should be exactly 51 events from the spammer in this room.");
+        assert.equal(count, 26, "There should be exactly 26 events from the spammer in this room.");
     })
 })