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28e40a0f1b
* Initial metrics support based on Prometheus This commit introduces initial support for metrics in open5gs. The metrics code is added as libogsmetrics (lib/metrics/), with a well defined opaque API to manage different types of metrics, allowing for different implementations for different technologies to scrap the metrics (placed as lib/metrics/<impl>/. The implementation is right now selected at build time, in order to be able to opt-out the related dependencies for users not interested in the features. 2 implementations are already provided in this commit to start with: * void: Default implementation. Empty stubs, acts as a NOOP. * prometheus: open5gs processes become Prometheus servers, offering states through an http server to the Prometheus scrappers. Relies on libprom (prometheus-client-ci [1] project) to track the metrics and format them during export, and libmicrohttpd to make the export possible through HTTP. [1] https://github.com/digitalocean/prometheus-client-c The prometheus-client-c is not well maintained nowadays in upstream, and furthermore it uses a quite peculiar mixture of build systems (autolib on the main dir, cmake for libprom in a subdir). This makes it difficult to have it widely available in distros, and difficult to find it if it is installed in the system. Hence, the best is to include it as a meson subproject like we already do for freeDiameter. An open5gs fork is requried in order to have an extra patch adding a top-level CMakeList.txt in order to be able to includ eit from open5gs's meson build. Furthermore, this allows adding bugfixes to the subproject if any are found in the future. * [SMF] Initial metrics support * [SMF] Add metrics at gtp_node level * docs: Add tutorial documenting metrics with Prometheus
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/*
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* Copyright (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef OGS_METRICS_H
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#define OGS_METRICS_H
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#include "ogs-core.h"
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#include "ogs-app.h"
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#define OGS_METRICS_INSIDE
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#include "metrics/context.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#undef OGS_METRICS_INSIDE
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extern int __ogs_metrics_domain;
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#undef OGS_LOG_DOMAIN
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#define OGS_LOG_DOMAIN __ogs_metrics_domain
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#ifdef __cplusplus
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}
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#endif
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#endif /* OGS_METRICS_H */
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