Function extractMetricFromCall

scripts/metricsdocgen/scanner/scanner.go:685–702

extractMetricFromCall attempts to extract a Metric from a function call expression. It returns the metric and true if successful, or an empty metric and false if the call is not a metric registration. Supported patterns: - prometheus.NewDesc() calls - prometheus.New*() and prometheus.New*Vec() with

(call *ast.CallExpr, decls declarations)

//   - prometheus.New*() and prometheus.New*Vec() with *Opts{}
//   - promauto.With(reg).New*() and factory.New*() patterns
func extractMetricFromCall(call *ast.CallExpr, decls declarations) (Metric, bool) {
	// Check for prometheus.NewDesc() pattern.
	if metric, ok := extractNewDescMetric(call, decls); ok {
		return metric, true
	}

	// Check for prometheus.New*() and prometheus.New*Vec() patterns.
	if metric, ok := extractOptsMetric(call, decls); ok {
		return metric, true
	}

	// Check for promauto.With(reg).New*() pattern.
	if metric, ok := extractPromautoMetric(call, decls); ok {
		return metric, true
	}

	return Metric{}, false
}

// String returns the metric in Prometheus text exposition format.
// Label values are empty strings and metric values are 0 since only