Code examples for CloudWatch using Amazon SDKs - Amazon CloudWatch
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Code examples for CloudWatch using Amazon SDKs

The following code examples show how to use CloudWatch with an Amazon software development kit (SDK).

Basics are code examples that show you how to perform the essential operations within a service.

Actions are code excerpts from larger programs and must be run in context. While actions show you how to call individual service functions, you can see actions in context in their related scenarios.

Scenarios are code examples that show you how to accomplish specific tasks by calling multiple functions within a service or combined with other Amazon Web Services services.

For a complete list of Amazon SDK developer guides and code examples, see Using CloudWatch with an Amazon SDK. This topic also includes information about getting started and details about previous SDK versions.

Get started

The following code examples show how to get started using CloudWatch.

.NET
Amazon SDK for .NET
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

using Amazon.CloudWatch; using Amazon.CloudWatch.Model; using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; namespace CloudWatchActions; public static class HelloCloudWatch { static async Task Main(string[] args) { // Use the AWS .NET Core Setup package to set up dependency injection for the Amazon CloudWatch service. // Use your AWS profile name, or leave it blank to use the default profile. using var host = Host.CreateDefaultBuilder(args) .ConfigureServices((_, services) => services.AddAWSService<IAmazonCloudWatch>() ).Build(); // Now the client is available for injection. var cloudWatchClient = host.Services.GetRequiredService<IAmazonCloudWatch>(); // You can use await and any of the async methods to get a response. var metricNamespace = "AWS/Billing"; var response = await cloudWatchClient.ListMetricsAsync(new ListMetricsRequest { Namespace = metricNamespace }); Console.WriteLine($"Hello Amazon CloudWatch! Following are some metrics available in the {metricNamespace} namespace:"); Console.WriteLine(); foreach (var metric in response.Metrics.Take(5)) { Console.WriteLine($"\tMetric: {metric.MetricName}"); Console.WriteLine($"\tNamespace: {metric.Namespace}"); Console.WriteLine($"\tDimensions: {string.Join(", ", metric.Dimensions.Select(m => $"{m.Name}:{m.Value}"))}"); Console.WriteLine(); } } }
  • For API details, see ListMetrics in Amazon SDK for .NET API Reference.

Java
SDK for Java 2.x
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.cloudwatch.CloudWatchClient; import software.amazon.awssdk.services.cloudwatch.model.CloudWatchException; import software.amazon.awssdk.services.cloudwatch.model.ListMetricsRequest; import software.amazon.awssdk.services.cloudwatch.paginators.ListMetricsIterable; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class HelloService { public static void main(String[] args) { final String usage = """ Usage: <namespace>\s Where: namespace - The namespace to filter against (for example, AWS/EC2).\s """; if (args.length != 1) { System.out.println(usage); System.exit(1); } String namespace = args[0]; Region region = Region.US_EAST_1; CloudWatchClient cw = CloudWatchClient.builder() .region(region) .build(); listMets(cw, namespace); cw.close(); } public static void listMets(CloudWatchClient cw, String namespace) { try { ListMetricsRequest request = ListMetricsRequest.builder() .namespace(namespace) .build(); ListMetricsIterable listRes = cw.listMetricsPaginator(request); listRes.stream() .flatMap(r -> r.metrics().stream()) .forEach(metrics -> System.out.println(" Retrieved metric is: " + metrics.metricName())); } catch (CloudWatchException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
  • For API details, see ListMetrics in Amazon SDK for Java 2.x API Reference.

Kotlin
SDK for Kotlin
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

/** Before running this Kotlin code example, set up your development environment, including your credentials. For more information, see the following documentation topic: https://docs.aws.amazon.com/sdk-for-kotlin/latest/developer-guide/setup.html */ suspend fun main(args: Array<String>) { val usage = """ Usage: <namespace> Where: namespace - The namespace to filter against (for example, AWS/EC2). """ if (args.size != 1) { println(usage) exitProcess(0) } val namespace = args[0] listAllMets(namespace) } suspend fun listAllMets(namespaceVal: String?) { val request = ListMetricsRequest { namespace = namespaceVal } CloudWatchClient { region = "us-east-1" }.use { cwClient -> cwClient .listMetricsPaginated(request) .transform { it.metrics?.forEach { obj -> emit(obj) } } .collect { obj -> println("Name is ${obj.metricName}") println("Namespace is ${obj.namespace}") } } }
  • For API details, see ListMetrics in Amazon SDK for Kotlin API reference.