| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package prometheus |
| 4 | |
| 5 | import ( |
| 6 | "fmt" |
| 7 | |
| 8 | "github.com/netdata/netdata/go/plugins/plugin/framework/charttpl" |
| 9 | "gopkg.in/yaml.v2" |
| 10 | ) |
| 11 | |
| 12 | // chartExpireAfterCycles mirrors V1's stale-chart removal (a chart was dropped after 10 missed |
| 13 | // cycles): chartengine autogen removes a chart/dimension after this many successful cycles in |
| 14 | // which its series is not seen. |
| 15 | const chartExpireAfterCycles = 10 |
| 16 | |
| 17 | // buildChartTemplate returns the per-job chart template (charttpl YAML) for the prometheus collector. |
| 18 | // It is a pure-autogen template: a stub group satisfies the schema, and chartengine autogen builds |
| 19 | // one chart per scraped metric, prefixing the context with context_namespace. The namespace is |
| 20 | // "prometheus" or "prometheus.<app>" so contexts match V1 (prometheus.<metric> / |
| 21 | // prometheus.<app>.<metric>); autogen joins namespace + "." + metric, so the app's separating dot is |
| 22 | // part of the namespace itself. |
| 23 | func buildChartTemplate(app string) (string, error) { |
| 24 | namespace := "prometheus" |
| 25 | if app != "" { |
| 26 | namespace = "prometheus." + app |
| 27 | } |
| 28 | |
| 29 | spec := charttpl.Spec{ |
| 30 | Version: charttpl.VersionV1, |
| 31 | ContextNamespace: namespace, |
| 32 | Engine: &charttpl.Engine{ |
| 33 | Autogen: &charttpl.EngineAutogen{ |
| 34 | Enabled: true, |
| 35 | ExpireAfterSuccessCycles: chartExpireAfterCycles, |
| 36 | }, |
| 37 | }, |
| 38 | Groups: []charttpl.Group{{Family: "prometheus"}}, |
| 39 | } |
| 40 | |
| 41 | if err := spec.Validate(); err != nil { |
| 42 | return "", fmt.Errorf("build prometheus chart template: %w", err) |
| 43 | } |
| 44 | |
| 45 | raw, err := yaml.Marshal(spec) |
| 46 | if err != nil { |
| 47 | return "", fmt.Errorf("marshal prometheus chart template: %w", err) |
| 48 | } |
| 49 | return string(raw), nil |
| 50 | } |