Merge pull request #3 from PrometheusClientNet/default-collector-registry

feat: use Metrics.DefaultCollectorRegistry by default, add overload

Author: phnx47

src/Prometheus.Client.DependencyInjection/ServiceCollectionExtensions.cs

@@ -7,9 +7,23 @@ namespace Prometheus.Client.DependencyInjection
 {
     public static class ServiceCollectionExtensions
     {
+        /// <summary>
+        /// Add IMetricFactory and ICollectorRegistry into service collection
+        /// </summary>
+        /// <param name="services">Service collection</param>
         public static void AddMetricFactory(this IServiceCollection services)
         {
-            services.AddSingleton<ICollectorRegistry, CollectorRegistry>();
+            services.AddMetricFactory(new CollectorRegistry());
+        }
+
+        /// <summary>
+        /// Add IMetricFactory and ICollectorRegistry into service collection
+        /// </summary>
+        /// <param name="services">Service collection</param>
+        /// <param name="collectorRegistry">Explicit collector registry to use</param>
+        public static void AddMetricFactory(this IServiceCollection services, ICollectorRegistry collectorRegistry)
+        {
+            services.AddSingleton(collectorRegistry);
             services.AddSingleton<IMetricFactory, MetricFactory>();
         }
     }