diff --git a/android/allowlists/allowlists.go b/android/allowlists/allowlists.go
index a5799a5..1f6ecb5 100644
--- a/android/allowlists/allowlists.go
+++ b/android/allowlists/allowlists.go
@@ -262,6 +262,7 @@
 		// build/make/tools/signapk BUILD file is generated, so build/make/tools is not recursive.
 		"build/make/tools":/* recursive = */ false,
 		"build/pesto":/* recursive = */ true,
+		"build/soong/ui/metrics/bp2build_progress_metrics_proto":/* recursive = */ true,
 
 		// external/bazelbuild-rules_android/... is needed by mixed builds, otherwise mixed builds analysis fails
 		// e.g. ERROR: Analysis of target '@soong_injection//mixed_builds:buildroot' failed
diff --git a/ui/metrics/bp2build_progress_metrics_proto/BUILD.bazel b/ui/metrics/bp2build_progress_metrics_proto/BUILD.bazel
new file mode 100644
index 0000000..356b188
--- /dev/null
+++ b/ui/metrics/bp2build_progress_metrics_proto/BUILD.bazel
@@ -0,0 +1,27 @@
+# Copyright (C) 2022 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("//build/bazel/rules/python:py_proto.bzl", "py_proto_library")
+
+proto_library(
+    name = "bp2build_proto",
+    srcs = ["bp2build.proto"],
+    strip_import_prefix = "",
+)
+
+py_proto_library(
+    name = "bp2build_py_proto",
+    deps = [":bp2build_proto"],
+    visibility = ["//build/bazel/scripts/bp2build-progress:__pkg__"],
+)
diff --git a/ui/metrics/bp2build_progress_metrics_proto/bp2build.proto b/ui/metrics/bp2build_progress_metrics_proto/bp2build.proto
new file mode 100644
index 0000000..4aee88b
--- /dev/null
+++ b/ui/metrics/bp2build_progress_metrics_proto/bp2build.proto
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = "proto3";
+
+package bp2build_proto;
+
+
+// Conversion progress report for root_modules .
+message Bp2buildConversionProgress {
+
+  // Soong module identifying information.
+  message Module {
+    // Name of the Soong module.
+    string name = 1;
+
+    // Directory that the Soong module is in.
+    string directory = 2;
+
+    // Module type of this module.
+    string type = 3;
+
+    // All unconverted transitive dependencies.
+    repeated string unconverted_deps = 4;
+
+    // Total number of transitive dependencies.
+    int32 num_deps = 5;
+  }
+
+  // Modules that the transitive dependencies were identified for.
+  repeated string root_modules = 1;
+
+  // Names of all dependencies of the root_modules.
+  int32 num_deps = 2;
+
+  // Module with all its unconverted transitive dependencies.
+  repeated Module unconverted = 3;
+}