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include build info in Prometheus metrics (#22819)
Related to: https://github.com/go-gitea/gitea/issues/18061 This PR adds build info to the Prometheus metrics. This includes: - goarch: https://pkg.go.dev/runtime#GOARCH - goos: https://pkg.go.dev/runtime#pkg-constants - goversion: https://pkg.go.dev/runtime#Version - gitea version: just exposes the existing code.gitea.io/gitea/modules/setting.AppVer It's a similar approach to what some other Golang projects are doing, e.g. Prometheus: https://github.com/prometheus/common/blob/main/version/info.go example /metrics response from Prometheus: ``` # HELP prometheus_build_info A metric with a constant '1' value labeled by version, revision, branch, goversion from which prometheus was built, and the goos and goarch for the build. # TYPE prometheus_build_info gauge prometheus_build_info{branch="HEAD",goarch="amd64",goos="linux",goversion="go1.19.4",revision="c0d8a56c69014279464c0e15d8bfb0e153af0dab",version="2.41.0"} 1 ``` /metrics response from gitea with this PR: ``` # HELP gitea_build_info Build information # TYPE gitea_build_info gauge gitea_build_info{goarch="amd64",goos="linux",goversion="go1.20",version="2c6cc0b8c"} 1 ``` Signed-off-by: Michal Wasilewski <mwasilewski@gmx.com> <!-- Please check the following: 1. Make sure you are targeting the `main` branch, pull requests on release branches are only allowed for bug fixes. 2. Read contributing guidelines: https://github.com/go-gitea/gitea/blob/main/CONTRIBUTING.md 3. Describe what your pull request does and which issue you're targeting (if any) --> Signed-off-by: Michal Wasilewski <mwasilewski@gmx.com>
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@ -4,7 +4,10 @@
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package metrics
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package metrics
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import (
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import (
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"runtime"
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activities_model "code.gitea.io/gitea/models/activities"
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activities_model "code.gitea.io/gitea/models/activities"
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"code.gitea.io/gitea/modules/setting"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus"
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)
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)
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@ -17,6 +20,7 @@ type Collector struct {
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Accesses *prometheus.Desc
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Accesses *prometheus.Desc
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Actions *prometheus.Desc
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Actions *prometheus.Desc
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Attachments *prometheus.Desc
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Attachments *prometheus.Desc
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BuildInfo *prometheus.Desc
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Comments *prometheus.Desc
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Comments *prometheus.Desc
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Follows *prometheus.Desc
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Follows *prometheus.Desc
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HookTasks *prometheus.Desc
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HookTasks *prometheus.Desc
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@ -62,6 +66,16 @@ func NewCollector() Collector {
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"Number of Attachments",
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"Number of Attachments",
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nil, nil,
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nil, nil,
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),
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),
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BuildInfo: prometheus.NewDesc(
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namespace+"build_info",
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"Build information",
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[]string{
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"goarch",
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"goos",
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"goversion",
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"version",
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}, nil,
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),
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Comments: prometheus.NewDesc(
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Comments: prometheus.NewDesc(
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namespace+"comments",
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namespace+"comments",
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"Number of Comments",
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"Number of Comments",
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@ -195,6 +209,7 @@ func (c Collector) Describe(ch chan<- *prometheus.Desc) {
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ch <- c.Accesses
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ch <- c.Accesses
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ch <- c.Actions
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ch <- c.Actions
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ch <- c.Attachments
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ch <- c.Attachments
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ch <- c.BuildInfo
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ch <- c.Comments
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ch <- c.Comments
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ch <- c.Follows
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ch <- c.Follows
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ch <- c.HookTasks
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ch <- c.HookTasks
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@ -241,6 +256,15 @@ func (c Collector) Collect(ch chan<- prometheus.Metric) {
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prometheus.GaugeValue,
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prometheus.GaugeValue,
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float64(stats.Counter.Attachment),
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float64(stats.Counter.Attachment),
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)
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)
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ch <- prometheus.MustNewConstMetric(
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c.BuildInfo,
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prometheus.GaugeValue,
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1,
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runtime.GOARCH,
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runtime.GOOS,
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runtime.Version(),
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setting.AppVer,
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)
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ch <- prometheus.MustNewConstMetric(
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ch <- prometheus.MustNewConstMetric(
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c.Comments,
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c.Comments,
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prometheus.GaugeValue,
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prometheus.GaugeValue,
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