diff --git a/Tethering/src/com/android/networkstack/tethering/metrics/TetheringMetrics.java b/Tethering/src/com/android/networkstack/tethering/metrics/TetheringMetrics.java
index d8e631e..2c6054d 100644
--- a/Tethering/src/com/android/networkstack/tethering/metrics/TetheringMetrics.java
+++ b/Tethering/src/com/android/networkstack/tethering/metrics/TetheringMetrics.java
@@ -75,6 +75,8 @@
                     .setUserType(userTypeToEnum(callerPkg))
                     .setUpstreamType(UpstreamType.UT_UNKNOWN)
                     .setErrorCode(ErrorCode.EC_NO_ERROR)
+                    .setUpstreamEvents(UpstreamEvents.newBuilder())
+                    .setDurationMillis(0)
                     .build();
         mBuilderMap.put(downstreamType, statsBuilder);
     }
@@ -110,7 +112,8 @@
                 reported.getErrorCode().getNumber(),
                 reported.getDownstreamType().getNumber(),
                 reported.getUpstreamType().getNumber(),
-                reported.getUserType().getNumber());
+                reported.getUserType().getNumber(),
+                null, 0);
         if (DBG) {
             Log.d(TAG, "Write errorCode: " + reported.getErrorCode().getNumber()
                     + ", downstreamType: " + reported.getDownstreamType().getNumber()
diff --git a/Tethering/src/com/android/networkstack/tethering/metrics/stats.proto b/Tethering/src/com/android/networkstack/tethering/metrics/stats.proto
index 46a47af..27f2126 100644
--- a/Tethering/src/com/android/networkstack/tethering/metrics/stats.proto
+++ b/Tethering/src/com/android/networkstack/tethering/metrics/stats.proto
@@ -21,12 +21,38 @@
 
 import "frameworks/proto_logging/stats/enums/stats/connectivity/tethering.proto";
 
+// Logs each upstream for a successful switch over
+message UpstreamEvent {
+  // Transport type of upstream network
+  optional .android.stats.connectivity.UpstreamType upstream_type = 1;
+
+  // A time period that an upstream continued
+  optional int64 duration_millis = 2;
+}
+
+message UpstreamEvents {
+  repeated UpstreamEvent upstream_event = 1;
+}
+
 /**
  * Logs Tethering events
  */
 message NetworkTetheringReported {
-   optional .android.stats.connectivity.ErrorCode error_code = 1;
-   optional .android.stats.connectivity.DownstreamType downstream_type = 2;
-   optional .android.stats.connectivity.UpstreamType upstream_type = 3;
-   optional .android.stats.connectivity.UserType user_type = 4;
+    // Tethering error code
+    optional .android.stats.connectivity.ErrorCode error_code = 1;
+
+    // Tethering downstream type
+    optional .android.stats.connectivity.DownstreamType downstream_type = 2;
+
+    // Transport type of upstream network
+    optional .android.stats.connectivity.UpstreamType upstream_type = 3  [deprecated = true];
+
+    // The user type of switching tethering
+    optional .android.stats.connectivity.UserType user_type = 4;
+
+    // Log each transport type of upstream network event
+    optional UpstreamEvents upstream_events = 5;
+
+    // A time period that a downstreams exists
+    optional int64 duration_millis = 6;
 }
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/metrics/TetheringMetricsTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/metrics/TetheringMetricsTest.java
index 6a85718..7fdde97 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/metrics/TetheringMetricsTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/metrics/TetheringMetricsTest.java
@@ -88,6 +88,8 @@
                 .setUserType(user)
                 .setUpstreamType(UpstreamType.UT_UNKNOWN)
                 .setErrorCode(error)
+                .setUpstreamEvents(UpstreamEvents.newBuilder())
+                .setDurationMillis(0)
                 .build();
         verify(mTetheringMetrics).write(expectedReport);
     }