diff --git a/envoy/config/resource_monitor/fixed_heap/v2alpha/BUILD b/envoy/config/resource_monitor/fixed_heap/v2alpha/BUILD
new file mode 100644
index 00000000..adc77e5b
--- /dev/null
+++ b/envoy/config/resource_monitor/fixed_heap/v2alpha/BUILD
@@ -0,0 +1,8 @@
+load("//bazel:api_build_system.bzl", "api_proto_library_internal")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_library_internal(
+    name = "fixed_heap",
+    srcs = ["fixed_heap.proto"],
+)
diff --git a/envoy/config/resource_monitor/fixed_heap/v2alpha/fixed_heap.proto b/envoy/config/resource_monitor/fixed_heap/v2alpha/fixed_heap.proto
new file mode 100644
index 00000000..08e3c653
--- /dev/null
+++ b/envoy/config/resource_monitor/fixed_heap/v2alpha/fixed_heap.proto
@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+package envoy.config.resource_monitor.fixed_heap.v2alpha;
+option go_package = "v2alpha";
+
+message FixedHeapConfig {
+  // Limit of the Envoy process heap size. This is used to calculate heap memory pressure which
+  // is defined as (current heap size)/max_heap_size_bytes.
+  uint64 max_heap_size_bytes = 1;
+}