AWS lambda documentation change

Service: lambda · 2026-06-10 · Documentation low

File: lambda/latest/dg/lambda-managed-instances-dotnet-runtime.md

Summary

Added timeout handling examples for .NET Lambda functions

Security assessment

Operational best practices for resource management without security-specific context or vulnerability fixes

Diff

diff --git a/lambda/latest/dg/lambda-managed-instances-dotnet-runtime.md b/lambda/latest/dg/lambda-managed-instances-dotnet-runtime.md
index 8bbd7767c..339e2e41e 100644
--- a//lambda/latest/dg/lambda-managed-instances-dotnet-runtime.md
+++ b//lambda/latest/dg/lambda-managed-instances-dotnet-runtime.md
@@ -123,0 +124,38 @@ Use `ILambdaContext.RemainingTime` to detect timeouts. See [Error handling and r
+**Example: Timeout handling**
+
+Check remaining time before each unit of work and stop processing before the timeout fires. Configure the buffer based on the expected duration of your next chunk of work.
+    
+    
+    private static readonly TimeSpan Buffer = TimeSpan.FromMilliseconds(2000);
+    
+    public APIGatewayProxyResponse FunctionHandler(APIGatewayProxyRequest request, ILambdaContext context)
+    {
+        var items = JsonSerializer.Deserialize<List<string>>(request.Body);
+        foreach (var item in items)
+        {
+            if (context.RemainingTime < Buffer)
+                return new APIGatewayProxyResponse { StatusCode = 206, Body = "Timeout approaching, stopping early" };
+            ProcessItem(item);
+        }
+        return new APIGatewayProxyResponse { StatusCode = 200, Body = "Done" };
+    }
+
+**Example: Propagating deadlines to downstream calls**
+
+When making calls to downstream services, propagate the remaining time as a timeout to avoid hanging on network calls that would outlive your invocation. Use a `CancellationToken` with a shared client rather than creating a new client per invocation:
+    
+    
+    using Amazon.S3;
+    
+    private static readonly IAmazonS3 s3 = new AmazonS3Client();
+    
+    public async Task<string> FunctionHandler(APIGatewayProxyRequest request, ILambdaContext context)
+    {
+        var timeout = context.RemainingTime - TimeSpan.FromMilliseconds(500);
+        if (timeout < TimeSpan.FromSeconds(1)) timeout = TimeSpan.FromSeconds(1);
+    
+        using var cts = new CancellationTokenSource(timeout);
+        await s3.GetObjectAsync("my-bucket", "my-key", cts.Token);
+        return "Done";
+    }
+