1 files changed, 39 insertions, 0 deletions
diff --git a/dnsdist-metrics.hh b/dnsdist-metrics.hh
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--- /dev/null
+++ b/dnsdist-metrics.hh
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+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#pragma once
+
+#include <cinttypes>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <variant>
+
+namespace dnsdist::metrics
+{
+using Error = std::string;
+
+[[nodiscard]] std::optional<Error> declareCustomMetric(const std::string& name, const std::string& type, const std::string& description, std::optional<std::string> customName);
+[[nodiscard]] std::variant<uint64_t, Error> incrementCustomCounter(const std::string_view& name, uint64_t step);
+[[nodiscard]] std::variant<uint64_t, Error> decrementCustomCounter(const std::string_view& name, uint64_t step);
+[[nodiscard]] std::variant<double, Error> setCustomGauge(const std::string_view& name, const double value);
+[[nodiscard]] std::variant<double, Error> getCustomMetric(const std::string_view& name);
+}