Add ability to set a metrics prefix

Author: niemyjski

src/Foundatio/Queues/QueueBase.cs

@@ -41,6 +41,8 @@ protected QueueBase(TOptions options) : base(options?.TimeProvider, options?.Log
     {
         _options = options ?? throw new ArgumentNullException(nameof(options));
         _metricsPrefix = $"foundatio.{typeof(T).Name.ToLowerInvariant()}";
+        if (!String.IsNullOrEmpty(options.MetricsPrefix))
+            _metricsPrefix = $"{_metricsPrefix}.{options.MetricsPrefix}";
 
         QueueId = options.Name + Guid.NewGuid().ToString("N").Substring(10);
 

src/Foundatio/Queues/SharedQueueOptions.cs

@@ -9,6 +9,11 @@ public class SharedQueueOptions<T> : SharedOptions where T : class
     public int Retries { get; set; } = 2;
     public TimeSpan WorkItemTimeout { get; set; } = TimeSpan.FromMinutes(5);
     public ICollection<IQueueBehavior<T>> Behaviors { get; set; } = new List<IQueueBehavior<T>>();
+
+    /// <summary>
+    /// Allows you to set a prefix on queue metrics. This allows you to have unique metrics for keyed queues (e.g., priority queues).
+    /// </summary>
+    public string MetricsPrefix { get; set; }
 }
 
 public class SharedQueueOptionsBuilder<T, TOptions, TBuilder> : SharedOptionsBuilder<TOptions, TBuilder>
@@ -61,4 +66,14 @@ public TBuilder AddBehavior(IQueueBehavior<T> behavior)
 
         return (TBuilder)this;
     }
+
+    /// <summary>
+    /// Allows you to set a prefix on queue metrics. This allows you to have unique metrics for keyed queues (e.g., priority queues).
+    /// </summary>
+    public TBuilder MetricsPrefix(string prefix)
+    {
+        if (!String.IsNullOrEmpty(prefix))
+            Target.MetricsPrefix = prefix;
+        return (TBuilder)this;
+    }
 }