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diff --git a/src/feature/metrics/metrics_sys.h b/src/feature/metrics/metrics_sys.h
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+/* Copyright (c) 2020, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * @file metrics_sys.h
+ * @brief Header for feature/metrics/metrics_sys.c
+ **/
+
+#ifndef TOR_FEATURE_METRICS_METRICS_SYS_H
+#define TOR_FEATURE_METRICS_METRICS_SYS_H
+
+extern const struct subsys_fns_t sys_metrics;
+
+/**
+ * Subsystem level for the metrics system.
+ *
+ * Defined here so that it can be shared between the real and stub
+ * definitions.
+ **/
+#define METRICS_SUBSYS_LEVEL (99)
+
+#endif /* !defined(TOR_FEATURE_METRICS_METRICS_SYS_H) */