diff --git a/backend/pkg/messages/filters.go b/backend/pkg/messages/filters.go
index c1a28eb55..5682b2463 100644
--- a/backend/pkg/messages/filters.go
+++ b/backend/pkg/messages/filters.go
@@ -2,7 +2,11 @@
 package messages
 
 func IsReplayerType(id int) bool {
+<<<<<<< HEAD
 	return 1 != id && 3 != id && 17 != id && 23 != id && 24 != id && 25 != id && 26 != id && 27 != id && 28 != id && 29 != id && 30 != id && 31 != id && 32 != id && 33 != id && 35 != id && 42 != id && 52 != id && 56 != id && 62 != id && 63 != id && 64 != id && 66 != id && 78 != id && 80 != id && 81 != id && 82 != id && 125 != id && 126 != id && 127 != id && 112 != id && 107 != id && 91 != id && 92 != id && 94 != id && 95 != id && 97 != id && 98 != id && 99 != id && 101 != id && 104 != id && 110 != id && 111 != id
+=======
+	return 1 != id && 3 != id && 17 != id && 23 != id && 24 != id && 25 != id && 26 != id && 27 != id && 28 != id && 29 != id && 30 != id && 31 != id && 32 != id && 33 != id && 35 != id && 42 != id && 52 != id && 56 != id && 62 != id && 63 != id && 64 != id && 66 != id && 78 != id && 80 != id && 81 != id && 82 != id && 115 != id && 125 != id && 126 != id && 127 != id && 107 != id && 91 != id && 92 != id && 94 != id && 95 != id && 97 != id && 98 != id && 99 != id && 101 != id && 104 != id && 110 != id && 111 != id
+>>>>>>> 3e1b8c39f (change(tracker): add nodes drop message)
 }
 
 func IsIOSType(id int) bool {
diff --git a/backend/pkg/messages/messages.go b/backend/pkg/messages/messages.go
index bff0daea0..9890c5fff 100644
--- a/backend/pkg/messages/messages.go
+++ b/backend/pkg/messages/messages.go
@@ -79,6 +79,7 @@ const (
 	MsgBatchMeta                   = 80
 	MsgBatchMetadata               = 81
 	MsgPartitionedMessage          = 82
+	MsgRemovedNodesCount           = 115
 	MsgIssueEvent                  = 125
 	MsgSessionEnd                  = 126
 	MsgSessionSearch               = 127
@@ -2029,6 +2030,29 @@ func (msg *PartitionedMessage) TypeID() int {
 	return 82
 }
 
+type RemovedNodesCount struct {
+	message
+	NodesCount uint64
+	DOMDropped bool
+}
+
+func (msg *RemovedNodesCount) Encode() []byte {
+	buf := make([]byte, 21)
+	buf[0] = 115
+	p := 1
+	p = WriteUint(msg.NodesCount, buf, p)
+	p = WriteBoolean(msg.DOMDropped, buf, p)
+	return buf[:p]
+}
+
+func (msg *RemovedNodesCount) Decode() Message {
+	return msg
+}
+
+func (msg *RemovedNodesCount) TypeID() int {
+	return 115
+}
+
 type IssueEvent struct {
 	message
 	MessageID uint64
diff --git a/ee/connectors/msgcodec/messages.py b/ee/connectors/msgcodec/messages.py
index 91fb36a63..16763fe59 100644
--- a/ee/connectors/msgcodec/messages.py
+++ b/ee/connectors/msgcodec/messages.py
@@ -708,6 +708,14 @@ class PartitionedMessage(Message):
         self.part_total = part_total
 
 
+class RemovedNodesCount(Message):
+    __id__ = 115
+
+    def __init__(self, nodes_count, dom_dropped):
+        self.nodes_count = nodes_count
+        self.dom_dropped = dom_dropped
+
+
 class IssueEvent(Message):
     __id__ = 125
 
diff --git a/ee/connectors/msgcodec/msgcodec.py b/ee/connectors/msgcodec/msgcodec.py
index 02b5b5557..40e2ef648 100644
--- a/ee/connectors/msgcodec/msgcodec.py
+++ b/ee/connectors/msgcodec/msgcodec.py
@@ -630,6 +630,12 @@ class MessageCodec(Codec):
                 part_total=self.read_uint(reader)
             )
 
+        if message_id == 115:
+            return RemovedNodesCount(
+                nodes_count=self.read_uint(reader),
+                dom_dropped=self.read_boolean(reader)
+            )
+
         if message_id == 125:
             return IssueEvent(
                 message_id=self.read_uint(reader),
diff --git a/mobs/messages.rb b/mobs/messages.rb
index 99e917778..88ae76f20 100644
--- a/mobs/messages.rb
+++ b/mobs/messages.rb
@@ -448,6 +448,31 @@ end
 
 # 90-111 reserved iOS
 
+
+message 112, 'InputChange', :replayer => false do
+    uint 'ID'
+    string 'Value'
+    boolean 'ValueMasked'
+    string 'Label'
+    int 'HesitationTime'
+    int 'InputDuration'
+end
+
+message 113, 'SelectionChange' do
+    uint 'SelectionStart'
+    uint 'SelectionEnd'
+    string 'Selection'
+end
+
+message 114, 'MouseThrashing' do
+    uint 'Timestamp'
+end
+
+message 115, 'RemovedNodesCount', :replayer => false do
+    uint 'NodesCount'
+    boolean 'DOMDropped'
+end
+
 ## Backend-only
 message 125, 'IssueEvent', :replayer => false, :tracker => false do
   uint 'MessageID'
@@ -468,22 +493,3 @@ message 127, 'SessionSearch', :tracker => false, :replayer => false  do
 end
 
 # since tracker 4.1.10
-
-message 112, 'InputChange', :replayer => false do
-    uint 'ID'
-    string 'Value'
-    boolean 'ValueMasked'
-    string 'Label'
-    int 'HesitationTime'
-    int 'InputDuration'
-end
-
-message 113, 'SelectionChange' do
-    uint 'SelectionStart'
-    uint 'SelectionEnd'
-    string 'Selection'
-end
-
-message 114, 'MouseThrashing' do
-    uint 'Timestamp'
-end
\ No newline at end of file
diff --git a/tracker/tracker/src/main/app/nodes.ts b/tracker/tracker/src/main/app/nodes.ts
index 387679380..b94823cce 100644
--- a/tracker/tracker/src/main/app/nodes.ts
+++ b/tracker/tracker/src/main/app/nodes.ts
@@ -26,6 +26,10 @@ export default class Nodes {
     listeners.push([type, listener, useCapture])
   }
 
+  getNodesCount() {
+    return this.nodes.length
+  }
+
   registerNode(node: Node): [/*id:*/ number, /*isNew:*/ boolean] {
     let id: number = (node as any)[this.node_id]
     const isNew = id === undefined
diff --git a/tracker/tracker/src/main/app/observer/observer.ts b/tracker/tracker/src/main/app/observer/observer.ts
index 9e93dde2d..5972e9850 100644
--- a/tracker/tracker/src/main/app/observer/observer.ts
+++ b/tracker/tracker/src/main/app/observer/observer.ts
@@ -8,6 +8,7 @@ import {
   CreateElementNode,
   MoveNode,
   RemoveNode,
+  RemovedNodesCount,
 } from '../messages.gen.js'
 import App from '../index.js'
 import {
@@ -216,6 +217,8 @@ export default abstract class Observer {
   }
 
   private unbindTree(node: Node) {
+    let removed = 0
+    const nodesCount = this.app.nodes.getNodesCount()
     const id = this.app.nodes.unregisterNode(node)
     if (id !== undefined && this.recents.get(id) === RecentsType.Removed) {
       // Sending RemoveNode only for parent to maintain
@@ -235,9 +238,10 @@ export default abstract class Observer {
         false,
       )
       while (walker.nextNode()) {
+        removed += 1
         this.app.nodes.unregisterNode(walker.currentNode)
       }
-      // MBTODO: count and send RemovedNodesCount (for the page crash detection in heuristics)
+      this.app.send(RemovedNodesCount(removed, removed / nodesCount > 0.5))
     }
   }