Function Load

config/config.go:74–127

Load parses the YAML input s into a Config.

(s string, logger *slog.Logger)

// Load parses the YAML input s into a Config.
func Load(s string, logger *slog.Logger) (*Config, error) {
	cfg := &Config{}
	// If the entire config body is empty the UnmarshalYAML method is
	// never called. We thus have to set the DefaultConfig at the entry
	// point as well.
	*cfg = DefaultConfig

	err := yaml.UnmarshalStrict([]byte(s), cfg)
	if err != nil {
		return nil, err
	}

	// When the config body is empty, UnmarshalYAML is never called, so
	// TSDBConfig may still be nil.
	if cfg.StorageConfig.TSDBConfig == nil {
		retention := DefaultTSDBRetentionConfig
		cfg.StorageConfig.TSDBConfig = &TSDBConfig{Retention: &retention}
	}

	b := labels.NewScratchBuilder(0)
	cfg.GlobalConfig.ExternalLabels.Range(func(v labels.Label) {
		newV := os.Expand(v.Value, func(s string) string {
			if s == "$" {
				return "$"
			}
			if v := os.Getenv(s); v != "" {
				return v
			}
			logger.Warn("Empty environment variable", "name", s)
			return ""
		})
		if newV != v.Value {
			logger.Debug("External label replaced", "label", v.Name, "input", v.Value, "output", newV)
		}
		// Note newV can be blank. https://github.com/prometheus/prometheus/issues/11024
		b.Add(v.Name, newV)
	})
	if !b.Labels().IsEmpty() {
		cfg.GlobalConfig.ExternalLabels = b.Labels()
	}

	switch cfg.OTLPConfig.TranslationStrategy {
	case otlptranslator.UnderscoreEscapingWithSuffixes, otlptranslator.UnderscoreEscapingWithoutSuffixes:
	case "":
	case otlptranslator.NoTranslation, otlptranslator.NoUTF8EscapingWithSuffixes:
		if cfg.GlobalConfig.MetricNameValidationScheme == model.LegacyValidation {
			return nil, fmt.Errorf("OTLP translation strategy %q is not allowed when UTF8 is disabled", cfg.OTLPConfig.TranslationStrategy)
		}
	default:
		return nil, fmt.Errorf("unsupported OTLP translation strategy %q", cfg.OTLPConfig.TranslationStrategy)
	}
	cfg.loaded = true
	return cfg, nil
}

// LoadFile parses and validates the given YAML file into a read-only Config.
// Callers should never write to or shallow copy the returned Config.