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diff --git a/src/lib/d2srv/d2_stats.h b/src/lib/d2srv/d2_stats.h
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+// Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef D2_STATS_H
+#define D2_STATS_H
+
+#include <list>
+#include <string>
+
+namespace isc {
+namespace d2 {
+
+/// @brief Statistics Names.
+class D2Stats {
+public:
+ /// @brief Global NCR statistics names.
+ ///
+ /// - ncr-received
+ /// - ncr-invalid
+ /// - ncr-error
+ static const std::list<std::string> ncr;
+
+ /// @brief Global DNS update statistics names.
+ ///
+ /// - update-sent
+ /// - update-signed
+ /// - update-unsigned
+ /// - update-success
+ /// - update-timeout
+ /// - update-error
+ static const std::list<std::string> update;
+
+ /// @brief Key DNS update statistics names.
+ ///
+ /// - update-sent
+ /// - update-success
+ /// - update-timeout
+ /// - update-error
+ static const std::list<std::string> key;
+
+ /// @brief Initialize D2 statistics.
+ ///
+ /// @note: Add default samples if needed.
+ static void init();
+};
+
+} // namespace d2
+} // namespace isc
+
+#endif // D2_STATS_H