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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);
}
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