You can use Amazon CloudWatch Synthetics to continually monitor your services. You can\ncreate and manage canaries, which are modular, lightweight scripts\nthat monitor your endpoints and APIs\nfrom the outside-in. You can set up your canaries to run\n24 hours a day, once per minute. The canaries help you check the availability and latency\nof your web services and troubleshoot anomalies by investigating load time data,\nscreenshots of the UI, logs, and metrics. The canaries seamlessly integrate with CloudWatch\nServiceLens to help you trace the causes of impacted nodes in your applications. For more\ninformation, see Using ServiceLens to Monitor\nthe Health of Your Applications in the Amazon CloudWatch User\nGuide.
\nBefore you create and manage canaries, be aware of the security considerations. For more\ninformation, see Security\nConsiderations for Synthetics Canaries.
\n\n## Installing\n\nTo install this package, use the CLI of your favorite package manager:\n\n- `npm install @aws-sdk/client-synthetics`\n- `yarn add @aws-sdk/client-synthetics`\n- `pnpm add @aws-sdk/client-synthetics`\n\n## Getting Started\n\n### Import\n\nThe AWS SDK is modulized by clients and commands.\nTo send a request, you only need to import the `SyntheticsClient` and\nthe commands you need, for example `ListGroupsCommand`:\n\n```js\n// ES5 example\nconst { SyntheticsClient, ListGroupsCommand } = require(\"@aws-sdk/client-synthetics\");\n```\n\n```ts\n// ES6+ example\nimport { SyntheticsClient, ListGroupsCommand } from \"@aws-sdk/client-synthetics\";\n```\n\n### Usage\n\nTo send a request:\n\n- Instantiate a client with configuration (e.g. credentials, region).\n - See [docs/CLIENTS](https://github.com/aws/aws-sdk-js-v3/blob/main/supplemental-docs/CLIENTS.md) for configuration details.\n - See [@aws-sdk/config](https://github.com/aws/aws-sdk-js-v3/blob/main/packages/config/README.md) for additional options.\n- Instantiate a command with input parameters.\n- Call the `send` operation on the client, providing the command object as input.\n\n```js\nconst client = new SyntheticsClient({ region: \"REGION\" });\n\nconst params = { /** input parameters */ };\nconst command = new ListGroupsCommand(params);\n```\n\n#### Async/await\n\nWe recommend using the [await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await)\noperator to wait for the promise returned by send operation as follows:\n\n```js\n// async/await.\ntry {\n const data = await client.send(command);\n // process data.\n} catch (error) {\n // error handling.\n} finally {\n // finally.\n}\n```\n\n#### Promises\n\nYou can also use [Promise chaining](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises#chaining).\n\n```js\nclient\n .send(command)\n .then((data) => {\n // process data.\n })\n .catch((error) => {\n // error handling.\n })\n .finally(() => {\n // finally.\n });\n```\n\n#### Aggregated client\n\nThe aggregated client class is exported from the same package, but without the \"Client\" suffix.\n\n`Synthetics` extends `SyntheticsClient` and additionally supports all operations, waiters, and paginators as methods.\nThis style may be familiar to you from the AWS SDK for JavaScript v2.\n\nIf you are bundling the AWS SDK, we recommend using only the bare-bones client (`SyntheticsClient`).\nMore details are in the blog post on\n[modular packages in AWS SDK for JavaScript](https://aws.amazon.com/blogs/developer/modular-packages-in-aws-sdk-for-javascript/).\n\n```ts\nimport { Synthetics } from \"@aws-sdk/client-synthetics\";\n\nconst client = new Synthetics({ region: \"REGION\" });\n\n// async/await.\ntry {\n const data = await client.listGroups(params);\n // process data.\n} catch (error) {\n // error handling.\n}\n\n// Promises.\nclient\n .listGroups(params)\n .then((data) => {\n // process data.\n })\n .catch((error) => {\n // error handling.\n });\n\n// callbacks (not recommended).\nclient.listGroups(params, (err, data) => {\n // process err and data.\n});\n```\n\n### Troubleshooting\n\nWhen the service returns an exception, the error will include the exception information,\nas well as response metadata (e.g. request id).\n\n```js\ntry {\n const data = await client.send(command);\n // process data.\n} catch (error) {\n const { requestId, cfId, extendedRequestId } = error.$metadata;\n console.log({ requestId, cfId, extendedRequestId });\n /**\n * The keys within exceptions are also parsed.\n * You can access them by specifying exception names:\n * if (error.name === 'SomeServiceException') {\n * const value = error.specialKeyInException;\n * }\n */\n}\n```\n\nSee also [docs/ERROR_HANDLING](https://github.com/aws/aws-sdk-js-v3/blob/main/supplemental-docs/ERROR_HANDLING.md).\n\n## Getting Help\n\nPlease use these community resources for getting help.\nWe use GitHub issues for tracking bugs and feature requests, but have limited bandwidth to address them.\n\n- Visit the [Developer Guide](https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/welcome.html)\n or [API Reference](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/index.html).\n- Check out the blog posts tagged with [`aws-sdk-js`](https://aws.amazon.com/blogs/developer/tag/aws-sdk-js/)\n on AWS Developer Blog.\n- Ask a question on [StackOverflow](https://stackoverflow.com/questions/tagged/aws-sdk-js) and tag it with `aws-sdk-js`.\n- Join the AWS JavaScript community on [gitter](https://gitter.im/aws/aws-sdk-js-v3).\n- If it turns out that you may have found a bug, please [open an issue](https://github.com/aws/aws-sdk-js-v3/issues/new/choose).\n\nTo test your universal JavaScript code in Node.js, browser and react-native environments,\nvisit our [code samples repo](https://github.com/aws-samples/aws-sdk-js-tests).\n\n## Contributing\n\nThis client code is generated automatically. Any modifications will be overwritten the next time the `@aws-sdk/client-synthetics` package is updated.\nTo contribute to client you can check our [generate clients scripts](https://github.com/aws/aws-sdk-js-v3/tree/main/scripts/generate-clients).\n\n## License\n\nThis SDK is distributed under the\n[Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0),\nsee LICENSE for more information.\n\n## Client Commands (Operations List)\n\n