diff --git a/envoy/config/bootstrap/v3/BUILD b/envoy/config/bootstrap/v3/BUILD
index 0a4f9a6e..63eb22d3 100644
--- a/envoy/config/bootstrap/v3/BUILD
+++ b/envoy/config/bootstrap/v3/BUILD
@@ -15,6 +15,7 @@ api_proto_package(
         "//envoy/config/overload/v3:pkg",
         "//envoy/config/trace/v3:pkg",
         "//envoy/extensions/transport_sockets/tls/v3:pkg",
+        "//envoy/type/v3:pkg",
         "@com_github_cncf_udpa//udpa/annotations:pkg",
         "@com_github_cncf_udpa//udpa/core/v1:pkg",
     ],
diff --git a/envoy/config/bootstrap/v3/bootstrap.proto b/envoy/config/bootstrap/v3/bootstrap.proto
index 27c59bfc..9abd3a37 100644
--- a/envoy/config/bootstrap/v3/bootstrap.proto
+++ b/envoy/config/bootstrap/v3/bootstrap.proto
@@ -14,6 +14,7 @@ import "envoy/config/metrics/v3/stats.proto";
 import "envoy/config/overload/v3/overload.proto";
 import "envoy/config/trace/v3/http_tracer.proto";
 import "envoy/extensions/transport_sockets/tls/v3/secret.proto";
+import "envoy/type/v3/percent.proto";
 
 import "google/protobuf/duration.proto";
 import "google/protobuf/struct.proto";
@@ -297,6 +298,7 @@ message ClusterManager {
 // Envoy process watchdog configuration. When configured, this monitors for
 // nonresponsive threads and kills the process after the configured thresholds.
 // See the :ref:`watchdog documentation <operations_performance_watchdog>` for more information.
+// [#next-free-field: 6]
 message Watchdog {
   option (udpa.annotations.versioning).previous_message_type = "envoy.config.bootstrap.v2.Watchdog";
 
@@ -314,10 +316,16 @@ message Watchdog {
   // kill behavior. If not specified the default is 0 (disabled).
   google.protobuf.Duration kill_timeout = 3;
 
-  // If at least two watched threads have been nonresponsive for at least this
-  // duration assume a true deadlock and kill the entire Envoy process. Set to 0
-  // to disable this behavior. If not specified the default is 0 (disabled).
+  // If max(2, ceil(registered_threads * Fraction(*multikill_threshold*)))
+  // threads have been nonresponsive for at least this duration kill the entire
+  // Envoy process. Set to 0 to disable this behavior. If not specified the
+  // default is 0 (disabled).
   google.protobuf.Duration multikill_timeout = 4;
+
+  // Sets the threshold for *multikill_timeout* in terms of the percentage of
+  // nonresponsive threads required for the *multikill_timeout*.
+  // If not specified the default is 0.
+  type.v3.Percent multikill_threshold = 5;
 }
 
 // Runtime :ref:`configuration overview <config_runtime>` (deprecated).
diff --git a/envoy/config/bootstrap/v4alpha/BUILD b/envoy/config/bootstrap/v4alpha/BUILD
index 0fd53ed1..97d0d49f 100644
--- a/envoy/config/bootstrap/v4alpha/BUILD
+++ b/envoy/config/bootstrap/v4alpha/BUILD
@@ -14,6 +14,7 @@ api_proto_package(
         "//envoy/config/metrics/v4alpha:pkg",
         "//envoy/config/overload/v3:pkg",
         "//envoy/extensions/transport_sockets/tls/v4alpha:pkg",
+        "//envoy/type/v3:pkg",
         "@com_github_cncf_udpa//udpa/annotations:pkg",
         "@com_github_cncf_udpa//udpa/core/v1:pkg",
     ],
diff --git a/envoy/config/bootstrap/v4alpha/bootstrap.proto b/envoy/config/bootstrap/v4alpha/bootstrap.proto
index 41de2a87..84959f40 100644
--- a/envoy/config/bootstrap/v4alpha/bootstrap.proto
+++ b/envoy/config/bootstrap/v4alpha/bootstrap.proto
@@ -13,6 +13,7 @@ import "envoy/config/listener/v4alpha/listener.proto";
 import "envoy/config/metrics/v4alpha/stats.proto";
 import "envoy/config/overload/v3/overload.proto";
 import "envoy/extensions/transport_sockets/tls/v4alpha/secret.proto";
+import "envoy/type/v3/percent.proto";
 
 import "google/protobuf/duration.proto";
 import "google/protobuf/struct.proto";
@@ -288,6 +289,7 @@ message ClusterManager {
 // Envoy process watchdog configuration. When configured, this monitors for
 // nonresponsive threads and kills the process after the configured thresholds.
 // See the :ref:`watchdog documentation <operations_performance_watchdog>` for more information.
+// [#next-free-field: 6]
 message Watchdog {
   option (udpa.annotations.versioning).previous_message_type = "envoy.config.bootstrap.v3.Watchdog";
 
@@ -305,10 +307,16 @@ message Watchdog {
   // kill behavior. If not specified the default is 0 (disabled).
   google.protobuf.Duration kill_timeout = 3;
 
-  // If at least two watched threads have been nonresponsive for at least this
-  // duration assume a true deadlock and kill the entire Envoy process. Set to 0
-  // to disable this behavior. If not specified the default is 0 (disabled).
+  // If max(2, ceil(registered_threads * Fraction(*multikill_threshold*)))
+  // threads have been nonresponsive for at least this duration kill the entire
+  // Envoy process. Set to 0 to disable this behavior. If not specified the
+  // default is 0 (disabled).
   google.protobuf.Duration multikill_timeout = 4;
+
+  // Sets the threshold for *multikill_timeout* in terms of the percentage of
+  // nonresponsive threads required for the *multikill_timeout*.
+  // If not specified the default is 0.
+  type.v3.Percent multikill_threshold = 5;
 }
 
 // Runtime :ref:`configuration overview <config_runtime>` (deprecated).