cmd: Refactor tetragon-metrics-docs command

Targets and InitMetrics function are now passed as arguments to the New
function. This is done so that the New function can be reused to generate
different references (e.g. for different metrics groups).

Signed-off-by: Anna Kapuscinska <[email protected]>

cmd/tetragon-metrics-docs/main.go

@@ -14,19 +14,20 @@ import (
 	"github.com/cilium/tetragon/pkg/metricsconfig"
 )
 
-func main() {
-	if err := New().Execute(); err != nil {
-		os.Exit(1)
-	}
-}
+type initMetricsFunc func(string, *prometheus.Registry, *slog.Logger) error
 
-func New() *cobra.Command {
+func main() {
 	targets := map[string]string{
 		"health":    "Tetragon Health",
 		"resources": "Tetragon Resources",
 		"events":    "Tetragon Events",
 	}
+	if err := New(targets, initMetrics).Execute(); err != nil {
+		os.Exit(1)
+	}
+}
 
+func New(targets map[string]string, init initMetricsFunc) *cobra.Command {
 	overrides := []metricsmd.LabelOverrides{
 		// Theses metrics takes VCS info into account supplied at build
 		// time, which changes every build, so override those.
@@ -65,7 +66,7 @@ func New() *cobra.Command {
 	config := &metricsmd.Config{
 		Targets:        targets,
 		LabelOverrides: overrides,
-		InitMetrics:    initMetrics,
+		InitMetrics:    init,
 		HeadingLevel:   1,
 	}