Show warnings for Agents that run on OS versions not supported by .NET 8

src/Agent.Listener/Agent.Listener.csproj

@@ -28,7 +28,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Update="net6.json">
+    <None Update="net8.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>

src/Agent.Listener/SelfUpdater.cs

@@ -154,41 +154,6 @@ private async Task<bool> UpdateNeeded(string targetVersion, CancellationToken to
                 return false;
             }
 
-            //Checking if current system support .NET 6 agent
-            if (agentVersion.Major == 2 && serverVersion.Major == 3)
-            {
-                Trace.Verbose("Checking if your system supports .NET 6");
-
-                try
-                {
-                    string systemId = PlatformUtil.GetSystemId();
-                    SystemVersion systemVersion = PlatformUtil.GetSystemVersion();
-
-                    Trace.Verbose($"The system you are running on: \"{systemId}\" ({systemVersion})");
-
-                    if (await PlatformUtil.DoesSystemPersistsInNet6Whitelist())
-                    {
-                        // Check version of the system
-                        if (!await PlatformUtil.IsNet6Supported())
-                        {
-                            Trace.Warning($"The operating system the agent is running on is \"{systemId}\" ({systemVersion}), which will not be supported by the .NET 6 based v3 agent. Please upgrade the operating system of this host to ensure compatibility with the v3 agent. See https://aka.ms/azdo-pipeline-agent-version");
-                            return false;
-                        }
-                    }
-                    else
-                    {
-                        Trace.Warning($"The operating system the agent is running on is \"{systemId}\" ({systemVersion}), which has not been tested with the .NET 6 based v3 agent. The v2 agent wil not automatically upgrade to the v3 agent. You can manually download the .NET 6 based v3 agent from https://github.com/microsoft/azure-pipelines-agent/releases. See https://aka.ms/azdo-pipeline-agent-version");
-                        return false;
-                    }
-
-                    Trace.Verbose("The system persists in the list of systems supporting .NET 6");
-                }
-                catch (Exception ex)
-                {
-                    Trace.Error($"Error has occurred while checking if system supports .NET 6: {ex}");
-                }
-            }
-
             if (serverVersion.CompareTo(agentVersion) > 0)
             {
                 return true;

src/Agent.Listener/net6.json → src/Agent.Listener/net8.json

@@ -3,7 +3,7 @@
     "id": "alpine",
     "versions": [
       {
-        "name": "3.13+"
+        "name": "3.17+"
       }
     ]
   },
@@ -12,126 +12,119 @@
     "versions": [
       {
         "name": "2"
-      }
-    ]
-  },
-  {
-    "id": "centos",
-    "versions": [
+      },
       {
-        "name": "7+"
+        "name": "2023"
       }
     ]
   },
   {
     "id": "debian",
     "versions": [
       {
-        "name": "10+"
+        "name": "11+"
       }
     ]
   },
   {
     "id": "fedora",
     "versions": [
       {
-        "name": "33+"
+        "name": "39+"
       }
     ]
   },
   {
     "id": "macOS",
     "versions": [
       {
-        "name": "10.15+"
+        "name": "12+"
       }
     ]
   },
   {
     "id": "mariner",
     "versions": [
       {
-        "name": "1.0+"
+        "name": "2.0+"
       }
     ]
   },
   {
     "id": "opensuse-leap",
     "versions": [
       {
-        "name": "15+"
+        "name": "15.5+"
       }
     ]
   },
   {
     "id": "rhel",
     "versions": [
       {
-        "name": "7+"
+        "name": "8+"
       }
     ]
   },
   {
     "id": "sles",
     "versions": [
       {
-        "name": "12.2+"
+        "name": "15+"
       }
     ]
   },
   {
     "id": "ubuntu",
     "versions": [
       {
-        "name": "16.04"
+        "name": "20.04"
+      },
+      {
+        "name": "22.04"
       },
       {
-        "name": "18.04"
+        "name": "23.10"
       },
       {
-        "name": "20.04+"
+        "name": "24.04"
       }
-
     ]
   },
   {
     "id": "Windows Client",
     "versions": [
       {
-        "name": "7",
-        "version": "7601+"
-      },
-      {
-        "name": "8.1"
+        "name": "10",
+        "version": "1607+"
       },
       {
-        "name": "10",
-        "version": "14393+"
+        "name": "11"
       }
     ]
   },
   {
     "id": "Windows Nano Server",
     "versions": [
       {
-        "version": "17763+"
+        "version": "1809+"
       }
     ]
   },
   {
     "id": "Windows Server",
     "versions": [
       {
-        "name": "2012+"
+        "name": "2016+"
       }
     ]
   },
   {
     "id": "Windows Server Core",
     "versions": [
       {
-        "name": "2012+"
+        "name": "2016+"
       }
     ]
   }
-]
+]

src/Agent.Sdk/Knob/AgentKnobs.cs

@@ -381,7 +381,7 @@ public class AgentKnobs
 
         public static readonly Knob AgentFailOnIncompatibleOS = new Knob(
             nameof(AgentFailOnIncompatibleOS),
-            "Allow agent to fail pipelines on incampatible OS",
+            "Allow agent to fail pipelines on incompatible OS",
             new EnvironmentKnobSource("AGENT_FAIL_ON_INCOMPATIBLE_OS"),
             new RuntimeKnobSource("AGENT_FAIL_ON_INCOMPATIBLE_OS"),
             new BuiltInDefaultKnobSource("false"));
@@ -592,11 +592,6 @@ public class AgentKnobs
             new EnvironmentKnobSource("AGENT_DISABLE_DRAIN_QUEUES_AFTER_TASK"),
             new BuiltInDefaultKnobSource("false"));
 
-        public static readonly Knob EnableFetchingNet6List = new Knob(
-            nameof(EnableFetchingNet6List),
-            "Forces the agent to fetch list of .NET 6 supporting systems from server",
-            new EnvironmentKnobSource("AGENT_ENABLE_FETCHING_NET6_LIST"),
-            new BuiltInDefaultKnobSource("false"));
 
         public static readonly Knob EnableResourceUtilizationWarnings = new Knob(
             nameof(EnableResourceUtilizationWarnings),