Table of contents

Constructs Reference

A Project defines core settings and defaults for the CLI and other constructs like Checks. In many cases, you can just use set defaults for your Checks in the checks property and override them occasionally at the Check or CheckGroup level.

import { defineConfig } from 'checkly'
import { Frequency } from 'checkly/constructs'

export default defineConfig({
  projectName: 'Website Monitoring',
  logicalId: 'website-monitoring-1',
  repoUrl: 'https://github.com/acme/website',
  checks: {
    activated: true,
    muted: false,
    runtimeId: '2022.10',
    frequency: Frequency.EVERY_5M,
    locations: ['us-east-1', 'eu-west-1'],
    tags: ['website', 'api'],
    checkMatch: '**/__checks__/*.check.ts',
    ignoreDirectoriesMatch: [],
    playwrightConfig: {},
    browserChecks: {
      frequency: Frequency.EVERY_10M,
      testMatch: '**/__checks__/*.spec.ts',
    },
  },
  cli: {
    runLocation: 'eu-west-1',
    privateRunLocation: 'private-dc1'
  }
})

• projectName: A friendly name for your Project.

• logicalId: A unique identifier for this Project. Like all logical ID’s, this should be stable.

• repoUrl: An optional URL to a Git repository.

• checks: Top-level defaults for all Checks in this Project. If not overridden at the Check or CheckGroup level, these settings apply to your Checks. Takes all Check properties

  • checkMatch: A glob pattern where the CLI should look for files containing Check constructs. For more info check the dedicated docs on checkMatch and testMatch
  • ignoreDirectoriesMatch: An array of glob patterns which directories should be ignored by the checkMatch property.
  • playwrightConfig: Subset of Playwright configuration options
  • browserChecks: Top-level defaults specifically for Browser Checks generated by a glob match pattern. All Check properties are valid here.
    • testMatch: Glob pattern where the CLI looks for Playwright test files, i.e. all .spec.ts files. For more info check the dedicated docs on checkMatch and testMatch

• cli: Defaults for CLI commands.

  • runLocation: The default run location when running npx checkly test.
  • privateRunLocation: The default private run location when running npx checkly test.

The CLI currently supports four Check types: API, Browser, Heartbeat and Multistep API Checks.

These Check types share properties derived from the abstract class Check.

Note that most properties have sane default values and do not need to be specified.

API Checks are a good fit for monitoring typical HTTP based endpoints like REST APIs and GraphQL APIs, but can also be used for form encoded payloads. The example below shows the following:

• It defines the basic Check properties like name, activated etc.
• It defines the HTTP method POST, url and the body
• It sets an extra header in the headers array.
• It sets an extra parameter in the queryParameters array, although you could add that to the URL directly too.
• It defines an array of assertions using the AssertionBuilder to assert that:
  • the HTTP response status is 200
  • the JSON response body has a property called name by using the JSON path expression $.name
  • the strict-transport-security response header’s max-age property has a value greater than 100000.
• It runs a setup script and teardown script, which are just TypeScript files referenced from the same directory.

The file hierarchy looks as follows:

├── __checks__
│   ├── hello-api.check.ts
│   ├── setup.ts
│   ├── teardown.ts

// hello-api.check.ts

import { ApiCheck, AssertionBuilder } from 'checkly/constructs'
import * as path from 'path'

new ApiCheck('hello-api-1', {
  name: 'Hello API',
  activated: true,
  setupScript: {
      entrypoint: path.join(__dirname, 'setup.ts')
  },
  tearDownScript: {
    entrypoint: path.join(__dirname, 'teardown.ts')
  },
  maxResponseTime: 10000,
  degradedResponseTime: 5000,
  request: {
    method: 'POST',
    url: 'https://httpbin.org/post',
    body: JSON.stringify({
      name: 'checkly'
    }),
    skipSSL: false,
    followRedirects: true,
    headers: [
      {
        key: 'X-My-Header',
        value: 'My custom header value'
      }
    ],
    queryParameters: [
      {
        key: 'myParam',
        value: 'true'
      }
    ],
    assertions: [
        AssertionBuilder.statusCode().equals(200),
        AssertionBuilder.jsonBody('$.name').notEmpty(),
        AssertionBuilder.headers('strict-transport-security', 'max-age=(\\d+)').greaterThan(10000),
    ]
  }
})

• setupScript: An object with either an entrypoint property that points to a .js|ts file, or a content property with raw JavaScript / TypeScript as a string. This runs before the API check is executed. Check our docs on how to use setup and teardown scripts.
• tearDownScript: An object with either an entrypoint property that points to a .js|ts file, or a content property with raw JavaScript / TypeScript as a string. This runs after the API check is executed. Check our docs on how to use setup and teardown scripts.
• maxResponseTime: The response time in milliseconds where a check should be considered failing.
• degradedResponseTime: The response time in milliseconds where a check should be considered degraded.
• shouldFail: Choose whether a failure should count as a pass. All requests with status code 400 or higher are reported as passed if set to true. The default behaviour if this setting is not defined is false.
• request: An object of the Request type. See the Request reference.

The request object is a mandatory part of an API check.

• url: A string for the target URL.
• method: The HTTP method as a string, i.e. GET | POST | PUT | PATCH | HEAD | DELETE | OPTIONS
• body: A string for HTTP request body.
• bodyType: A string indicating the type of body. Options are JSON | FORM | RAW | GRAPHQL | NONE. This property is mostly for rendering the body type in the web UI and not needed in most cases using the CLI.
• headers: An array of { key: 'X-My-Header', value: 123 } objects to define HTTP headers.
• queryParameters: An array of { key: 'my-param', value: 123 } objects to define query parameters.
• followRedirects: A boolean indicating automatic following of any 30x redirects.
• skipSSL: A boolean indicating whether invalid or self-signed SSL certificates should be validated.
• basicAuth: An object of the shape { username: 'admin', password: 'admin' } to set basic auth credentials.
• assertions: An array of assertions to validate status codes, response bodies and much more. See the AssertionBuilder reference.

To define assertions for the request of an ApiCheck you should use the AssertionBuilder. The AssertionBuilder provides a fluent API for the otherwise slightly cryptic JSON object that the CLI passes to the Checkly API. Here are some examples:

• Asserting an HTTP status code.

AssertionBuilder.statusCode().equals(200)
// renders to a JSON string
"{ source: 'STATUS_CODE', regex: '', property: '', comparison: 'EQUALS', target: '200' }"

• Asserting a part of a JSON response body using a JSON path expression. Learn more about using JSON path.

AssertionBuilder.jsonBody('$.data').greaterThan(2000),
// renders to a JSON string
"{ source: 'JSON_BODY', regex: '', property: '$.data', comparison: 'GREATER_THAN', target: '2000' }"

• Asserting the value of a part of an HTTP response header. Note that you can pass in a regex as the second argument.

AssertionBuilder.headers('strict-transport-security', 'max-age=(\\d+)').greaterThan(10000),
// renders to a JSON string
"{ source: 'HEADERS', regex: 'max-age=(\d+)', property: 'strict-transport-security', comparison: 'GREATER_THAN', target: '100000' }"

The AssertionBuilder defines the following sources as an entry to building an assertion.

• statusCode(): Assert the HTTP status code for the HTTP request, e.g. 200 or 404.
• jsonBody(property?): Assert the JSON response body. Accepts a JSON path expression as the property argument.
• textBody(): Assert the body as raw text.
• headers(propery?, regex?): Assert a set of response headers, takes the header name as the property argument and a regex to tease out a string from the header value.
• responseTime(): Assert the total response time of the HTTP request.

Read more about assertions in our docs on API check assertions.

A heartbeat check is a passive check type that expects pings from an external source, such as a scheduled job on a server, at a defined interval. A ping is an HTTP request to a given endpoint URL.

You can obtain the ping URL from our user interface or the CLI output of checkly deploy.

import { HeartbeatCheck } from 'checkly/constructs'

new HeartbeatCheck('heartbeat-check-1', {
  name: 'Send weekly newsletter job',
  period: 7,
  periodUnit: 'days',
  grace: 2,
  graceUnit: 'hours',
})

• period: The expected period of time between each ping. Between 30 seconds and 365 days.

• periodUnit: The unit of time for the period, the available options are 'seconds' | 'minutes' | 'hours' | 'days'.

• grace: The grace period to wait for before sending an alert. Between 0 seconds and 365 days.

• graceUnit: The unit of time for the grace period, the available options are 'seconds' | 'minutes' | 'hours' | 'days'.

Browser Checks are based on @playwright/test. You can just write .spec.js|ts files with test cases and the Checkly CLI will pick them up and apply some default settings like a name, run locations and run frequency to turn them into synthetic monitoring Checks.

However, you can override these global settings and configure individual Browser Checks just like all other built-in Check types. The most important thing is to set the code.entrypoint property and point it to your Playwright .spec.js|ts file. This property supports relative and absolute paths.

import { BrowserCheck, Frequency } from 'checkly/constructs'
import * as path from 'path'

new BrowserCheck('browser-check-1', {
  name: 'Browser check #1',
  frequency: Frequency.EVERY_10M,
  locations: ['us-east-1', 'eu-west-1'],
  code: {
    entrypoint: path.join(__dirname, 'home.spec.js')
  }
})

• code: an object with either an entrypoint property that points to .spec.js|ts file, or a content property with raw JavaScript / TypeScript as a string.

Similar to Browser Checks, Multistep API checks uses @playwright/test to define the script which the check runs, but Multistep checks always need to be defined in a construct before assigning a spec.js|ts file.

import { MultiStepCheck, Frequency } from 'checkly/constructs'
import * as path from 'path'

new MultiStepCheck('multistep-check-1', {
  name: 'Multistep Check #1',
  runtimeId: '2023.09',
  frequency: Frequency.EVERY_10M,
  locations: ['us-east-1', 'eu-west-1'],
  code: {
    entrypoint: path.join(__dirname, 'home.spec.ts')
  },
})

• code: an object with either an entrypoint property that points to .spec.js|ts file, or a content property with raw JavaScript / TypeScript as a string.

You can explicitly organize Checks in Check Groups.

This brings the following benefits:

1. Your Checks are organized in a folder in the Checkly web UI.
2. You can trigger all Checks in a group from the web UI and via a command line trigger.
3. You can manage group-level configuration like the runtime, activated & muted-state, tags and alert channels that trickle down to all the Checks in the group.

Note: you will notice that managing shared configuration between Checks is very easy just using JS/TS. You might not need Check Groups for that purpose.

You can add a Check to a group in two ways.

1. By passing the CheckGroup object for the group property of a Check.
2. For Browser Checks, we allow you to use the testMatch glob pattern to include any .spec.js|ts file, without having to create a BrowserCheck construct. This works the same ast the testMatch glob at the Project level.

import { CheckGroup, ApiCheck, Frequency } from 'checkly/constructs'

const group = new CheckGroup('check-group-1', {
  name: 'Group',
  activated: true,
  frequency: Frequency.EVERY_15M,
  locations: ['us-east-1', 'eu-west-1'],
  tags: ['api-group'],
  concurrency: 10,
  browserChecks: {
    frequency: Frequency.EVERY_30M,
    testMatch: '*.spec.js'
  }
})

new ApiCheck('check-group-api-check-1', {
  name: 'API check #1',
  group,
  request: {
    method: 'GET',
    url: 'https://mac-demo-repo.vercel.app/api/hello',
  }
})

• name: A friendly name for your Check Group.
• concurrency: A number indicating the amount of concurrent Checks to run when a group is triggered.
• frequency: How often to run the Checks within the group, i.e. Frequency.EVERY_15M for every fifteen minutes.
• locations: An array of location codes where to run the Checks in the group, i.e. ['us-east-1', 'eu-west-1'].
• privateLocations: An array of Private Locations slugs, i.e. ['datacenter-east-1'].
• alertChannels: An array of AlertChannel objects to which to send alert notifications.
• activated: A boolean value if all the Checks in the group are activated.
• muted: A boolean value if alert notifications from the Checks in the group are muted, i.e. not sent out.
• tags: An array of tags. Group tags trickle down to tags on the individual Checks. i.e. ['product', 'api']
• runtimeId: The ID of which runtime to use for the Checks in the group.
• environmentVariables: An array of objects defining variables in the group scope, i.e. [{ key: 'DEBUG', value: 'true' }]
• localSetupScript: Any JS/TS code as a string to run before each API Check in this group.
• localTearDownScript: Any JS/TS code as a string to run after each API Check in this group.
• retryStrategy: A RetryStrategy object configuring retries for failed check runs.
• apiCheckDefaults: A set of defaults for API Checks. This should not be needed. Just compose shared defaults using JS/TS.
• browserChecks: A set of defaults for Browser Checks. This should not be needed. Just compose shared defaults using JS/TS.
• runParallel: A boolean value if check should run in parallel (all locations at the same time) or round-robin.
• alertEscalationPolicy: An AlertEscalationPolicy object configuring alert-settings for check runs.

When adding checks to a group using testMatch, the CLI searches for files using the corresponding check file as a base path.

Note that you can configure two different frequency properties for API and Browser checks in a CheckGroup separatelly. The CLI follows a fallback logic using Check->CheckGroup->Project configurations.

Alert channels let you get alert notifications when a Check fails. Learn more about alerting in our docs All alert channels share a set of common properties to define when / how they should alert derived from the abstract class AlertChannel

• sendRecovery: A boolean if you want to receive recovery notifications.
• sendFailure: A boolean if you want to receive failure notifications.
• sendDegrade: A boolean if you want to receive degraded notifications. These only apply to API Checks.
• sslExpiry: A boolean if you want to receive a notification when a SSL/TLS certificate expires. This works only for API Checks.
• sslExpiryThreshold: A number indicating how many days before the certificate expiry date a notification will be triggered.

Alert channels are assigned to Checks and CheckGroups by instantiating a class and adding the resulting object to the alertChannels array.

Note that alert channels are only deployed to your Checkly account when referenced explicitly in the alertChannels property of a Project, CheckGroup or Check.

You can reference an existing alert channel in your Checkly account using the fromId() method on any AlertChannel class. When your CLI project is responsible for creating and managing alert channels, it integrates seamlessly with Checkly’s deployment control mechanisms. This ensures that any changes made are thoroughly validated.

For users with multiple Checkly CLI projects:

• Alert channels can be set up through the Checkly UI or any other method, ensuring they remain intact and unaffected by individual CLI project operations.

For users managing a single Checkly CLI project:

• The entire process of creating and subscribing to alert channels can be handled within that single project. This is made possible because the project references the logical ID of the alert channel, rather than an ID generated post-deployment.

If you attempt to deploy a project that references alert channels which have been removed or are no longer valid, the deployment process will not proceed. This feature helps maintain the integrity and reliability of your monitoring and alerting setup.

export const emailChannel = EmailAlertChannel.fromId(20)

You can obtain the ID for your alert channel either from the Checkly web UI or by utilizing our REST API.

Sends SMS notifications to phone number. Make sure to use standard international notation.

import { SmsAlertChannel } from 'checkly/constructs'

const smsChannel = new SmsAlertChannel('sms-channel-1', {
  name: 'Ops on-call',
  phoneNumber: '+31061234567890',
})

Learn more about SMS alert channels

Sends phone call notifications to phone number. Make sure to use standard international notation.

import { PhoneCallAlertChannel } from 'checkly/constructs'

const callChannel = new PhoneCallAlertChannel('call-channel-1', {
  phoneNumber: '+31061234567890',
})

Learn more about Phone Call alert channels

Sends email notifications to an email address. Only accepts one address, do not use multiple addresses separated by a comma.

import { EmailAlertChannel } from 'checkly/constructs'

const emailChannel = new EmailAlertChannel('email-channel-1', {
  address: 'alerts@acme.com',
})

Sends a Slack message to an incoming Slack webhook address. You can specify the target channel.

import { SlackAlertChannel } from 'checkly/constructs'

const slackChannel = new SlackAlertChannel('slack-channel-1', {
  url: new URL('https://hooks.slack.com/services/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'),
  channel: '#ops'
})

Learn more about Slack alert channels

Sends a webhook to any URL. Webhooks are very powerful and have quite some options. Here is an example that send

import { WebhookAlertChannel } from 'checkly/constructs'

const webhookChannel = new WebhookAlertChannel('webhook-channel-1', {
  name: 'Pushover webhook',
  method: 'POST',
  url: new URL('https://api.pushover.net/1/messages.json'),
  headers: [ { key: 'X-My-Header', value: 'myToken' }],
  template: `{
    "token":"FILL_IN_YOUR_SECRET_TOKEN_FROM_PUSHOVER",
    "user":"FILL_IN_YOUR_USER_FROM_PUSHOVER",
    "title":"{{ALERT_TITLE}}",
    "html":1,
    "priority":2,
    "retry":30,
    "expire":10800,
    "message":"{{ALERT_TYPE}} {{STARTED_AT}} ({{RESPONSE_TIME}}ms) {{RESULT_LINK}}"
  }`
})

• url: The URL where to send the webhook HTTP request.
• method: A string, either GET, POST, PUT, PATCH, HEAD or DELETE just like an API Check.
• template: This is commonly a JSON body. You can use Handlebars-style template variables to add custom data to the template.
• headers: An array of { key: 'X-My-Header', value: 123 } objects to define HTTP headers.
• queryParameters: An array of { key: 'my-param', value: 123 } objects to define query parameters. Learn more about Webhook alert channels and available variables

Sends an alert notification to your Opsgenie account.

import { OpsgenieAlertChannel } from 'checkly/constructs'

const opsGenieChannel = new OpsgenieAlertChannel('opsgenie-channel-1', {
  name: 'My Ops Team',
  region: 'EU',
  priority: 'P1',
  apiKey: 'xxxx123abc'
})

• name: Friendly name to recognise the integration.
• region: A string representing the Opsgenie location, either EU or US.
• priority: A string representing the severity level, P1 to P5.
• apiKey: An API key for your Opsgenie account.

Learn more about Opsgenie alert channels

Sends an alert notification to a specific service in your Pagerduty account

import { PagerdutyAlertChannel } from 'checkly/constructs'

const pagerdutyChannel = new PagerdutyAlertChannel('pagerduty-channel-1', {
  account: 'ACME',
  serviceName: 'ACME products',
  serviceKey: '872b9b58ff4a9n06d0dl9f20487bbqwew'
})

• account: The name of your Pagerduty account.
• serviceName: The name of your service defined in Pagerduty under which the alerts should be nested.
• serviceKey: The API key created by installing the Checkly integration in Pagerduty. We advise you to install the Pagerduty alert channel first from our UI to grab the serviceKey.

Learn more about Pagerduty alert channels

Creates a maintenance window that lets you schedule planned maintenance and prevents your checks from running at specific times.

import { MaintenanceWindow } from 'checkly/constructs'

new MaintenanceWindow('maintenance-window-1', {
  name: 'Programmed API maintenance',
  tags: ['production', 'api'],
  startsAt: new Date(),
  endsAt: new Date(new Date().valueOf() + (1 * 60 * 60 * 1000)), // a hour from now
  repeatInterval: 1,
  repeatUnit: 'MONTH',
  repeatEndsAt: new Date(new Date().valueOf() + (2160 * 60 * 60 * 1000)), // ~three months from now
})

• name: A friendly name for your Maintenance Window.
• tags: An array of tags. A list of one or more tags that filter which checks are affected by the maintenance window. i.e. ['production', 'api'].
• startsAt: The start date and time of the maintenance window as an ISO 8601 timestamp "YYYY-MM-DDTHH:mm:ss.sssZ" as returned by new Date().
• endsAt: The end date and time of the maintenance window as an ISO 8601 timestamp "YYYY-MM-DDTHH:mm:ss.sssZ" as returned by new Date().
• repeatInterval: The repeat interval of the maintenance window from the first occurrence.
• repeatUnit: The repeat strategy for the maintenance window. This is mandatory when you specify a repeat interval.
• repeatEndsAt: The end date and time when the maintenance window should stop repeating as an ISO 8601 timestamp "YYYY-MM-DDTHH:mm:ss.sssZ" as returned by new Date()

Learn more about maintenance windows in our docs

Creates a dashboard allowing you to display checks and their related metrics on a single page.

import * as path from 'path'
import { v4 as uuidv4 } from 'uuid'
import { Dashboard } from 'checkly/constructs'
new Dashboard('acme-dashboard-1', {
  header: 'ACME production',
  description: 'service availability and response times',
  tags: ['prod', 'api'],
  logo: 'https://assets.acme.com/images/acme-logo.png',
  customUrl: `status-test-cli-${uuidv4()}`,
  customCSS: {
    entrypoint: path.join(__dirname, 'dashboard.css'),
  }
})

You can add custom CSS by referencing a CSS file. Note, this is only available on Team and Enterprise plans.

/* dashboard.css */
.header {
  background: #080808;
  border-bottom-color: #313035;
  font-family: "SF Pro Display",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu, Cantarell,"Open Sans","Helvetica Neue",sans-serif;
}

.header .logo a {
  color: #f7f8f8;
}

• tags: A list of one or more tags that filter what checks will be shown in the dashboard. All checks are included if no tag is specified.
• customUrl: A subdomain name under “checklyhq.com”. Needs to be unique across all users. This is required if customDomain is not specified.
• customDomain: A custom user domain, e.g. “status.example.com”. See the docs on updating your DNS and SSL usage. This is required if customUrl is not specified.
• logo: A URL pointing to an image file that will be used as logo in the dashboard header.
• favicon: A URL pointing to an image file used as dashboard favicon.
• link: A URL link to redirect when dashboard logo is clicked on.
• header: A piece of text displayed at the top of your dashboard.
• description: A piece of text displayed below the header or title of your dashboard.
• width: Determines whether to use the full screen (FULL) or focus in the center (960PX). Default: FULL.
• refreshRate: How often (60, 300 or 600 seconds) to refresh the dashboard in seconds. Default: 60.
• paginate: Determines of pagination is on or off. Default: true.
• paginationRate?: How often (30, 60 or 300 seconds) to trigger pagination in seconds. Default: 60.
• checksPerPage: Number of checks displayed per page, between 1 and 20. Default: 15.
• useTagsAndOperator: When to use AND (instead OR) operator for tags lookup. Default: false.
• hideTags: Show or hide the tags on the dashboard. Default: false.
• enableIncidents: Enable or disable incidents on the dashboard. Default: false. Only accounts on Team and Enterprise plans can enable this feature.
• expandChecks: Expand or collapse checks on the dashboard. Default: false.
• showHeader: Show or hide header and description on the dashboard. Default: true.
• customCSS: Custom CSS to be applied to the dashboard. You can specify CSS code or an entrypoint to a file including the CSS code to use. Only accounts on Team and Enterprise plans can enable this feature.
• isPrivate: Determines if the dashboard is public or private. Default: false. Only accounts on Team and Enterprise plans can enable this feature.
• showP95: Show or hide the P95 stats on the dashboard. Default: true.
• showP99: Show or hide the P99 stats on the dashboard. Default: true.

Learn more about dashbaords in our docs

Creates a Private Location, so you can deploy one or more Checkly Agents on-prem, in a VPC or any segregated network.

// private-location.check.ts
import { PrivateLocation } from 'checkly/constructs'

export const myPrivateLocation = new PrivateLocation('private-location-1', {
  name: 'My private location',
  icon: 'squirrel',
  slugName: `my-private-location`
})

Use the new private location in a Check:

import * as path from 'path'
import { ApiCheck, AssertionBuilder } from 'checkly/constructs'
import { myPrivateLocation } from './private-location.check'

new ApiCheck('local-api-1', {
  name: 'Local API',
  activated: true,
  maxResponseTime: 10000,
  degradedResponseTime: 5000,
  privateLocations: [ myPrivateLocation ],
  request: {
    method: 'POST',
    url: 'https://my-local-domain:5000/post',
    body: JSON.stringify({
      name: 'checkly'
    }),
    skipSSL: true,
    followRedirects: true,
    assertions: [
        AssertionBuilder.statusCode().equals(200),
    ]
  }
})

• name: A friendly name for your private location.
• slugName: A valid unique slug name.
• icon: An icon to distinguish the location in our UI. You can pick any Octicons name.
• proxyUrl: Define a proxy for outgoing API check HTTP calls from your private location.

Learn more about private locations in our docs

RetryStrategy objects can be used to configure retries for failed check runs. Retry strategies can be added to Check and CheckGroup constructs. Learn more about retry strategies.

To build RetryStrategy objects you should use the RetryStrategyBuilder, which provides helper methods for configuring retries. As an example, you can configure a check to retry up to 4 times, in different regions, with waits of 30 seconds, 60 seconds, 90 seconds, and 120 seconds between attempts:

import { ApiCheck, RetryStrategyBuilder } from 'checkly/constructs'

new ApiCheck('retrying-check', {
  name: 'Check With Retries',
  retryStrategy: RetryStrategyBuilder.linearStrategy({
    baseBackoffSeconds: 30,
    maxRetries: 4,
    sameRegion: false,
  }),
  request: {
    method: 'GET',
    url: 'https://danube-web.shop/api/books'
  }
})

RetryStrategyBuilder supports the following helper methods:

• fixedStrategy(options): A fixed time between retries, e.g. 5s, 5s, 5s etc.
• linearStrategy(options): A linearly increasing time between retries, e.g. 5s, 10s, 15s, etc.
• exponentialStrategy(options): An exponentially increasing time between retries, e.g. 5s, 25s, 125s (2m and 5s) etc.

For all of the methods above, the options argument can be used to customize the following properties:

• baseBackoffSeconds: The amount of time to wait before the first retry. This will also be used to calculate the wait time for subsequent retries. Defaults to 60.
• maxRetries: The maximum number of times to retry the check. This value should be between 1 and 10. Defaults to 2.
• maxDurationSeconds: The maximum amount of time to continue retrying the check. Maximum 600 seconds. Defaults to 600 seconds.
• sameRegion: Whether retries should be run in the same region as the initial failed check run. Defaults to true.

AlertEscalationPolicy objects can be used to configure alert settings for the check runs. Alert escalation policies can be added to Check and CheckGroup constructs. Learn more about alert settings.

To build AlertEscalationPolicy objects you should use the AlertEscalationBuilder, which provides helper methods for configuring alert settings. As an example, you can configure an alert policy to notify you when a check run has failed twice consecutively, and with 2 reminders each 5 minutes apart.

import { AlertEscalationBuilder, ApiCheck } from 'checkly/constructs'

new ApiCheck('alerting-check', {
  name: 'Check With Alert Policy',
  alertEscalationPolicy: AlertEscalationBuilder.runBasedEscalation(2, { interval: 2, amount: 5 }, { enabled: true, percentage: 50 }),
  request: {
    method: 'GET',
    url: 'https://danube-web.shop/api/books'
  }
})

AlertEscalationBuilder supports the following methods:

• runBasedEscalation(failedRuns, reminder, parallelRunFailureThreshold): Number of times the check has to fail consecutively to get alerted.
• timeBasedEscalation(minutesFailing, reminder, parallelRunFailureThreshold): Amount of time (in minutes) it has to pass on failing checks to get alerted.

For all options above, the reminders argument can be used to configure reminders for the alert, it has the following properties:

• interval: Amount of time (in minutes) it has to pass to get the reminder.
• amount: Number of reminders.

At the same time the parallelRunFailureThreshold argument can be used to configure the threshold error for checks running in parallel:

• enabled: Applicable only for checks scheduled in parallel in multiple locations
• percentage: What percentage of regions needs to fail to trigger a failure alert, supported values: 10, 20, 30, 40, 50, 60, 70, 80, 90 & 100

CLI vs. Terraform & Pulumi Command Line Reference

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