Add labels config

Log4Net.Appender.Grafana.Loki.nuspec

@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>$id$</id>
-    <version>1.0.5</version>
+    <version>1.1.0</version>
     <title>$title$</title>
     <icon>loki.png</icon>
     <authors>Gabriel Cerutti</authors>

Loki/Labels.cs

@@ -2,27 +2,15 @@
 {
     public class LokiLabel
     {
-        public LokiLabel(string key, string value)
-        {
-            Key = key;
-            Value = value;
-        }
+        public string Key { get; set;  }
 
-        public string Key { get; }
-
-        public string Value { get; }
+        public string Value { get; set; }
     }
 
     public class LokiProperty
     {
-        public LokiProperty(string key, string value)
-        {
-            Key = key;
-            Value = value;
-        }
-
-        public string Key { get; }
+        public string Key { get; set; }
 
-        public string Value { get; }
+        public string Value { get; set; }
     }
 }

LokiAppender.cs

@@ -1,5 +1,6 @@
 using log4net.Appender;
 using log4net.Core;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.IO.Compression;
@@ -17,16 +18,19 @@ public class LokiAppender : BufferingAppenderSkeleton
         public string BasicAuthPassword { get; set; }
         public bool GZipCompression { get; set; }
         public bool TrustSelfSignedCerts { get; set; }
+        public LokiLabel Label { set { Labels.Add(value); } }
+        private List<LokiLabel> Labels = new List<LokiLabel>();
 
         private void PostLoggingEvent(LoggingEvent[] loggingEvents)
         {
-            var labels = new LokiLabel[] {
-                new LokiLabel("Application", Application),
-                new LokiLabel("Environment", Environment)
+            var labels = new List<LokiLabel>(Labels)
+            {
+                new LokiLabel { Key = "Application", Value = Application },
+                new LokiLabel { Key = "Environment", Value = Environment }
             };
             var properties = new LokiProperty[] {
-                new LokiProperty("MachineName", System.Environment.MachineName),
-                new LokiProperty("ProcessName", Process.GetCurrentProcess().ProcessName)
+                new LokiProperty { Key = "MachineName", Value = System.Environment.MachineName },
+                new LokiProperty { Key = "ProcessName", Value = Process.GetCurrentProcess().ProcessName }
             };
             var formatter = new LokiBatchFormatter(labels, properties);
             var httpClient = new LokiHttpClient(TrustSelfSignedCerts);

README.md

@@ -34,6 +34,10 @@ Sample Log4net config:
     <BasicAuthPassword value="password" /> <!-- To be added if basic authent enabled  -->
     <GZipCompression value="true" /> <!-- To compress the post request using GZip compression -->
     <TrustSelfSignedCerts value="false" /> <!-- To trust self signed certificates. Default: false -->
+    <Label> <!-- Add custom label -->
+			<Key value="apiGroup" />
+			<Value value="group1" />
+		</Label>
   </appender>
 </log4net>
 ```