New: Added UDP syslog support

src/NzbDrone.Core/Configuration/ConfigFileProvider.cs

@@ -45,6 +45,8 @@ namespace NzbDrone.Core.Configuration
         bool UpdateAutomatically { get; }
         UpdateMechanism UpdateMechanism { get; }
         string UpdateScriptPath { get; }
+        string SyslogServer { get; }
+        int SyslogPort { get; }
     }
 
     public class ConfigFileProvider : IConfigFileProvider
@@ -213,6 +215,9 @@ namespace NzbDrone.Core.Configuration
 
         public string UpdateScriptPath => GetValue("UpdateScriptPath", "", false);
 
+        public string SyslogServer => GetValue("SyslogServer", "", persist: false);
+        public int SyslogPort => GetValueInt("SyslogPort", 514, persist: false);
+
         public int GetValueInt(string key, int defaultValue, bool persist = true)
         {
             return Convert.ToInt32(GetValue(key, defaultValue, persist));

src/NzbDrone.Core/Instrumentation/ReconfigureLogging.cs

@@ -2,6 +2,8 @@
 using System.Linq;
 using NLog;
 using NLog.Config;
+using NLog.Targets.Syslog;
+using NLog.Targets.Syslog.Settings;
 using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Instrumentation;
@@ -40,6 +42,11 @@ namespace NzbDrone.Core.Instrumentation
                 minimumConsoleLogLevel = LogLevel.Info;
             }
 
+            if (_configFileProvider.SyslogServer.IsNotNullOrWhiteSpace())
+            {
+                SetSyslogParameters(_configFileProvider.SyslogServer, _configFileProvider.SyslogPort, minimumLogLevel);
+            }
+
             var rules = LogManager.Configuration.LoggingRules;
 
             //Console
@@ -101,6 +108,24 @@ namespace NzbDrone.Core.Instrumentation
             }
         }
 
+        private void SetSyslogParameters(string syslogServer, int syslogPort, LogLevel minimumLogLevel)
+        {
+            var syslogTarget = new SyslogTarget();
+
+            syslogTarget.Name = "syslogTarget";
+            syslogTarget.MessageSend.Protocol = ProtocolType.Udp;
+            syslogTarget.MessageSend.Udp.Port = syslogPort;
+            syslogTarget.MessageSend.Udp.Server = syslogServer;
+            syslogTarget.MessageSend.Udp.ReconnectInterval = 500;
+            syslogTarget.MessageCreation.Rfc = RfcNumber.Rfc5424;
+            syslogTarget.MessageCreation.Rfc5424.AppName = "Prowlarr";
+
+            var loggingRule = new LoggingRule("*", minimumLogLevel, syslogTarget);
+
+            LogManager.Configuration.AddTarget("syslogTarget", syslogTarget);
+            LogManager.Configuration.LoggingRules.Add(loggingRule);
+        }
+
         private List<LogLevel> GetLogLevels()
         {
             return new List<LogLevel>

src/NzbDrone.Core/Prowlarr.Core.csproj

@@ -7,6 +7,7 @@
     <PackageReference Include="FluentMigrator.Runner" Version="3.3.1" />
     <PackageReference Include="MailKit" Version="2.14.0" />
     <PackageReference Include="Microsoft.AspNetCore.WebUtilities" Version="2.2.0" />
+    <PackageReference Include="NLog.Targets.Syslog" Version="6.0.2" />
     <PackageReference Include="System.Memory" Version="4.5.4" />
     <PackageReference Include="System.ServiceModel.Syndication" Version="5.0.0" />
     <PackageReference Include="FluentMigrator.Runner.SQLite" Version="3.3.1" />