Initial metrics endpoint added in Prometheus style

logging/logging_metrics_test.go

@@ -0,0 +1,30 @@
+package logging
+
+import (
+	"net/http/httptest"
+	"testing"
+)
+
+func TestMetricRouteLabelFallbacks(t *testing.T) {
+	testCases := []struct {
+		name string
+		path string
+		want string
+	}{
+		{name: "root", path: "/", want: "/"},
+		{name: "health", path: "/healthz", want: "/healthz"},
+		{name: "metrics", path: "/metrics", want: "/metrics"},
+		{name: "bucket", path: "/some-bucket", want: "/{bucket}"},
+		{name: "object", path: "/some-bucket/private/path/file.jpg", want: "/{bucket}/*"},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			req := httptest.NewRequest("GET", tc.path, nil)
+			got := metricRouteLabel(req)
+			if got != tc.want {
+				t.Fatalf("metricRouteLabel(%q) = %q, want %q", tc.path, got, tc.want)
+			}
+		})
+	}
+}