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[feature] Initial Prometheus metrics implementation (#2334)

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* feat: Initial OTEL metrics

* docs: add metrics documentation

* fix: metrics endpoint conditional check

* feat: metrics endpoint basic auth

* fix: make metrics-auth-enabled default false

* fix: go fmt helpers.gen.go

* fix: add metric-related env vars to envparsing.sh

* fix: metrics docs

* fix: metrics related stuff in envparsing.sh

* fix: metrics docs

* chore: metrics docs wording

* fix: metrics stuff in envparsing?

* bump otel versions

---------

Co-authored-by: Tsuribori <user@acertaindebian>
Co-authored-by: Tsuribori <none@example.org>
Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>
This commit is contained in:
Tsuribori 2023-11-20 17:43:55 +02:00 • committed by GitHub
commit 1ba3e14b36
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251 changed files with 48389 additions and 22 deletions
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33
internal/web/metrics.go Normal file
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@ -0,0 +1,33 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package web
import (
"github.com/gin-gonic/gin"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
const (
metricsPath = "/metrics"
metricsUser = "metrics"
)
func (m *Module) metricsGETHandler(c *gin.Context) {
h := promhttp.Handler()
h.ServeHTTP(c.Writer, c.Request)
}

13
internal/web/web.go
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@ -110,6 +110,19 @@ func (m *Module) Route(r *router.Router, mi ...gin.HandlerFunc) {
r.AttachHandler(http.MethodGet, domainBlockListPath, m.domainBlockListGETHandler)
r.AttachHandler(http.MethodGet, tagsPath, m.tagGETHandler)
// Prometheus metrics export endpoint
if config.GetMetricsEnabled() {
metricsGroup := r.AttachGroup(metricsPath)
metricsGroup.Use(mi...)
// Attach basic auth if enabled
if config.GetMetricsAuthEnabled() {
metricsGroup.Use(gin.BasicAuth(gin.Accounts{
config.GetMetricsAuthUsername(): config.GetMetricsAuthPassword(),
}))
}
metricsGroup.Handle(http.MethodGet, "", m.metricsGETHandler)
}
// Attach redirects from old endpoints to current ones for backwards compatibility
r.AttachHandler(http.MethodGet, "/auth/edit", func(c *gin.Context) { c.Redirect(http.StatusMovedPermanently, userPanelPath) })
r.AttachHandler(http.MethodGet, "/user", func(c *gin.Context) { c.Redirect(http.StatusMovedPermanently, userPanelPath) })