diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 81d645efac784..20cca8e6d371e 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -2219,6 +2219,26 @@ message MetricsEvent {
     // OS: N-MR2
     ACTION_LOCK_BECAUSE_SIM_REMOVED = 497;
 
+    // ACTION: A captive portal was detected during network validation
+    // CATEGORY: NOTIFICATION
+    // OS: N-MR2
+    NOTIFICATION_NETWORK_SIGN_IN = 740;
+
+    // ACTION: An unvalidated network without Internet was selected by the user
+    // CATEGORY: NOTIFICATION
+    // OS: N-MR2
+    NOTIFICATION_NETWORK_NO_INTERNET = 741;
+
+    // ACTION: A validated network failed revalidation and lost Internet access
+    // CATEGORY: NOTIFICATION
+    // OS: N-MR2
+    NOTIFICATION_NETWORK_LOST_INTERNET = 742;
+
+    // ACTION: The system default network switched to a different network
+    // CATEGORY: NOTIFICATION
+    // OS: N-MR2
+    NOTIFICATION_NETWORK_SWITCH = 743;
+
     // ---- End N-MR2 Constants, all N-MR2 constants go above this line ----
 
     // Add new aosp constants above this line.