feat: add params to options

MetricPrefixName and AddLegacyMetrics

Author: phnx47

src/MetricServer.cs

@@ -42,7 +42,14 @@ public MetricServer(MetricServerOptions options)
             _options.CollectorRegistryInstance ??= Metrics.DefaultCollectorRegistry;
 
             if (_options.UseDefaultCollectors)
-                _options.CollectorRegistryInstance.UseDefaultCollectors();
+            {
+#pragma warning disable CS0618
+                if (options.AddLegacyMetrics)
+                    options.CollectorRegistryInstance.UseDefaultCollectors(options.MetricPrefixName, options.AddLegacyMetrics);
+                else
+                    options.CollectorRegistryInstance.UseDefaultCollectors(options.MetricPrefixName);
+#pragma warning restore CS0618
+            }
         }
 
         /// <inheritdoc />

src/MetricServerOptions.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Security.Cryptography.X509Certificates;
 using System.Text;
 using Prometheus.Client.Collectors;
@@ -43,5 +44,25 @@ public class MetricServerOptions
         ///     Charset of text response.
         /// </summary>
         public Encoding ResponseEncoding { get; set; }
+
+        /// <summary>
+        ///     Metric prefix for Default collectors
+        /// </summary>
+        public string MetricPrefixName { get; set; } = "";
+
+        /// <summary>
+        ///     Add legacy metrics to Default collectors
+        /// </summary>
+        ///  <remarks>
+        ///     Some metrics renamed since v5, <c>AddLegacyMetrics</c> will add old and new name<br />
+        ///     <para>
+        ///       process_virtual_bytes -> process_virtual_memory_bytes<br />
+        ///       process_private_bytes -> process_private_memory_bytes<br />
+        ///       process_working_set -> process_working_set_bytes<br />
+        ///       dotnet_totalmemory -> dotnet_total_memory_bytes
+        ///     </para>
+        /// </remarks>
+        [Obsolete("'AddLegacyMetrics' will be removed in future versions")]
+        public bool AddLegacyMetrics { get; set; }
     }
 }