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diff --git a/src/lib/dhcpsrv/dhcpsrv_log.h b/src/lib/dhcpsrv/dhcpsrv_log.h
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+// Copyright (C) 2011-2018 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 DHCPSRV_LOG_H
+#define DHCPSRV_LOG_H
+
+#include <dhcpsrv/dhcpsrv_messages.h>
+#include <log/macros.h>
+
+namespace isc {
+namespace dhcp {
+
+///@{
+/// \brief DHCP server library logging levels
+///
+/// Defines the levels used to output debug messages in the DHCP server
+/// library.  Note that higher numbers equate to more verbose (and detailed)
+/// output.
+
+/// @brief Traces normal operations
+///
+/// E.g. sending a query to the database etc.
+extern const int DHCPSRV_DBG_TRACE;
+
+/// @brief Records the results of the lookups
+///
+/// Using the example of tracing queries from the backend database, this will
+/// just record the summary results.
+extern const int DHCPSRV_DBG_RESULTS;
+
+/// @brief Additional information
+///
+/// Record detailed tracing. This is generally reserved for tracing access to
+/// the lease database.
+extern const int DHCPSRV_DBG_TRACE_DETAIL;
+
+/// @brief Additional information
+///
+/// Record detailed (and verbose) data on the server.
+extern const int DHCPSRV_DBG_TRACE_DETAIL_DATA;
+
+// Trace hook related operations
+extern const int DHCPSRV_DBG_HOOKS;
+
+///@}
+
+
+/// \brief DHCP server library Logger
+///
+/// Define the logger used to log messages.  We could define it in multiple
+/// modules, but defining in a single module and linking to it saves time and
+/// space.
+extern isc::log::Logger dhcpsrv_logger;
+
+} // namespace dhcp
+} // namespace isc
+
+#endif // DHCPSRV_LOG_H