Fixed verbose logging in plugin via using agent plugin context (#5364)

* Fixed verbose logging in plugin via using agent plugin context

* Fixed verbose logging in plugin via using agent plugin context

---------

Co-authored-by: Sanju Yadav <[email protected]>

Author: sanjuyadav24

src/Agent.Sdk/CommandPlugin.cs

@@ -28,7 +28,7 @@ public interface IAgentCommandPlugin
         Task ProcessCommandAsync(AgentCommandPluginExecutionContext executionContext, CancellationToken token);
     }
 
-    public class AgentCommandPluginExecutionContext : ITraceWriter
+    public class AgentCommandPluginExecutionContext : ITraceWriter, IKnobValueContext
     {
         private VssConnection _connection;
         private readonly object _stdoutLock = new object();
@@ -69,7 +69,7 @@ public void Verbose(string message, [CallerMemberName] string operation = "")
 #if DEBUG
             Debug(message);
 #else
-            string vstsAgentTrace = AgentKnobs.TraceVerbose.GetValue(UtilKnobValueContext.Instance()).AsString();
+            string vstsAgentTrace = AgentKnobs.TraceVerbose.GetValue(this).AsString();
             if (!string.IsNullOrEmpty(vstsAgentTrace))
             {
                 Debug(message);
@@ -212,5 +212,15 @@ private AgentWebProxySettings GetProxyConfiguration()
                 return null;
             }
         }
+
+        string IKnobValueContext.GetVariableValueOrDefault(string variableName)
+        {
+            return Variables.GetValueOrDefault(variableName)?.Value;
+        }
+
+        IScopedEnvironment IKnobValueContext.GetScopedEnvironment()
+        {
+            return new SystemEnvironment();
+        }
     }
 }

src/Agent.Sdk/TaskPlugin.cs

@@ -163,7 +163,7 @@ public void Verbose(string message, [CallerMemberName] string operation = "")
 #if DEBUG
             Debug(message);
 #else
-            string vstsAgentTrace = AgentKnobs.TraceVerbose.GetValue(UtilKnobValueContext.Instance()).AsString();
+            string vstsAgentTrace = AgentKnobs.TraceVerbose.GetValue(this).AsString();
             if (!string.IsNullOrEmpty(vstsAgentTrace))
             {
                 Debug(message);