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diff --git a/src/ceph/src/test/bench/stat_collector.h b/src/ceph/src/test/bench/stat_collector.h
new file mode 100644
index 0000000..4aef2bd
--- /dev/null
+++ b/src/ceph/src/test/bench/stat_collector.h
@@ -0,0 +1,19 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+
+#ifndef STATCOLLECTORH
+#define STATCOLLECTORH
+
+#include <stdint.h>
+
+class StatCollector {
+public:
+  virtual uint64_t next_seq() = 0;
+  virtual void start_write(uint64_t seq, uint64_t size) = 0;
+  virtual void start_read(uint64_t seq, uint64_t size) = 0;
+  virtual void write_applied(uint64_t seq) = 0;
+  virtual void write_committed(uint64_t seq) = 0;
+  virtual void read_complete(uint64_t seq) = 0;
+  virtual ~StatCollector() {}
+};
+
+#endif