diff --git a/cmds/statsd/src/active_config_list.proto b/cmds/statsd/src/active_config_list.proto
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+++ b/cmds/statsd/src/active_config_list.proto
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+/*
+ * Copyright (C) 2019 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 = "proto2";
+
+package android.os.statsd;
+option java_package = "com.android.os";
+option java_multiple_files = true;
+option java_outer_classname = "ActiveConfigProto";
+
+message ActiveMetric {
+    // metric id
+    optional int64 metric_id = 1;
+    // Remaining time to live in nano seconds. -1 for infinity.
+    optional int64 time_to_live_nanos = 2;
+}
+
+message ActiveConfig {
+    // config id
+    optional int64 config_id = 1;
+    // config uid
+    optional int32 uid = 2;
+    // metrics
+    repeated ActiveMetric active_metric = 3;
+}
+
+// all configs and their metrics on device.
+message ActiveConfigList {
+    repeated ActiveConfig active_config = 1;
+}
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