# ⚡️ serverless-provisioned-concurrency-autoscaling [](https://www.npmjs.com/package/serverless-provisioned-concurrency-autoscaling) [](https://github.com/neiman-marcus/serverless-provisioned-concurrency-autoscaling/actions?query=workflow%3A%22build%20ci%22) [](https://github.com/neiman-marcus/serverless-provisioned-concurrency-autoscaling/blob/master/LICENSE) [](https://github.com/neiman-marcus/serverless-provisioned-concurrency-autoscaling/blob/master/CONTRIBUTING.md) [](https://snyk.io/test/npm/serverless-provisioned-concurrency-autoscaling) Serverless Plugin for AWS Lambda Provisioned Concurrency Auto Scaling configuration. Related blog post can be found on the [Neiman Marcus Medium page](https://medium.com/neiman-marcus-tech/serverless-provisioned-concurrency-autoscaling-3d8ec23d10c). ## Usage Add the [NPM package](https://www.npmjs.com/package/serverless-provisioned-concurrency-autoscaling) to your project: ```bash $ npm install serverless-provisioned-concurrency-autoscaling ``` Add the plugin to your `serverless.yml`: Use version 1.9.1 for Serverless 1/ Serverless 2. Use version 2.0.1 for Serverless 3. ```yaml plugins: - serverless-provisioned-concurrency-autoscaling ``` ## Configuration Add `concurrencyAutoscaling` parameters under each function you wish to autoscale in your `serverless.yml`. Add `customMetric: true` if you want to use `Maximum` instead of `Average` statistic. ### Minimal Configuration ```yaml functions: hello: handler: handler.hello provisionedConcurrency: 1 concurrencyAutoscaling: true ``` ### Full Configuration ```yaml functions: world: handler: handler.world provisionedConcurrency: 1 concurrencyAutoscaling: enabled: true alias: provisioned maximum: 10 minimum: 1 usage: 0.75 scaleInCooldown: 0 scaleOutCooldown: 0 customMetric: statistic: maximum scheduledActions: - name: OpenOfficeTime startTime: "2025-01-01T00:00:00.000Z" endTime: "2025-01-01T23:59:59.999Z" timezone: "America/Chicago" schedule: "cron(30 8 ? * 1-6 *)" action: maximum: 100 minimum: 10 - name: CloseOfficeTime startTime: "2025-01-01T00:00:00.000Z" endTime: "2025-01-01T23:59:59.999Z" timezone: "America/Chicago" schedule: "cron(30 17 ? * 1-6 *)" action: maximum: 10 minimum: 1 - name: BlackFridayPeak1 startTime: "2025-01-02T00:00:00.000Z" endTime: "2025-01-02T23:59:59.999Z" timezone: "America/New_York" schedule: "at(2025-01-02T12:34:56)" action: maximum: 50 minimum: 5 - name: BlackFridayPeak2 startTime: "2025-01-03T00:00:00.000Z" endTime: "2025-01-03T23:59:59.999Z" timezone: "Europe/Warsaw" schedule: "rate(1 hour)" action: maximum: 50 minimum: 5 ``` That's it! With the next deployment, [serverless](https://serverless.com) will add Cloudformation resources to scale provisioned concurrency! You must provide at least `provisionedConcurrency` and `concurrencyAutoscaling` to enable autoscaling. Set `concurrencyAutoscaling` to a boolean, or object with configuration. Any omitted configuration will use module defaults. ### Defaults ```yaml alias: provisioned maximum: 10 minimum: 1 usage: 0.75 scaleInCooldown: 0 scaleOutCooldown: 0 ``` **Change in Default Behavior:** Starting in v1.7.0, the default scaleInCooldown is zero, not 120. This is backwards compatible, but different default behavior. This is in line with AWS' default scaleInCooldown. ### Scheduled Actions For more details on Scheduled Actions formats see [the AWS CloudFormation ScheduledAction description](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-applicationautoscaling-scalabletarget-scheduledaction.html). #### Description of `scheduledActions`'s properties: | Attribute | Description | Required | Example | |-----------|---------------------------------------------------------------------------------------------------------------|----------|----------------------------------| | endTime | The date and time that the action is scheduled to end, in UTC. | no | `2025-12-31T23:59:59.999Z` | | startTime | The date and time that the action is scheduled to begin, in UTC. | no | `2025-01-01T00:00:00.000Z` | | timezone | Timezone for `startTime` and `endTime`. Needs to be the canonical names of the IANA (supported by Yoda-Time). | no | `America/Chicago` | | name | The name of the scheduled action unique among all other scheduled actions on the specified scalable target. | yes | `OpenOfficeHourScheduleStart` | | schedule | One of three string formats: `at`, `cron` or `rate` (see next table). | yes | `cron(* 30 8 * 1-6 *)` | | action | Object of `minimum` and `maximum` properties. At least one is required. | yes | `minimum: 100`
`maximum: 105` | #### Description of `schedule`'s properties: For more details on schedule syntax see: * [AWS CloudFormation ScheduledAction description](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-applicationautoscaling-scalabletarget-scheduledaction.html) * [AWS Schedule Expressions for Rules](https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html) (cron) * [AWS Put Scheduled Action - Timezone](https://docs.aws.amazon.com/autoscaling/application/APIReference/API_PutScheduledAction.html#API_PutScheduledAction_RequestSyntax) | Attribute | Description | Format | Example | |-----------|--------------------------------------|---------------------------|---------------------------| | at | A start (a point in time) | `at(yyyy-mm-ddThh:mm:ss)` | `at(2025-01-02T00:00:00)` | | cron | A cron syntax for recurring schedule | `cron(fields)` | `cron(30 17 ? * 1-6 *)` | | rate | A rate | `rate(value unit)` | `rate(16 minuets)` | ## Known Issues/Limitations N/A ## Authors - [Clay Danford](mailto:crd013@gmail.com) - [Dawid Boissé](mailto:dawid.boisse@gmail.com) ## Contributors - [Vinoth Kumar Chandrasekar](vinothchandra87@gmail.com) ## Conduct / Contributing / License - Refer to our contribution guidelines to contribute to this project. See [CONTRIBUTING.md](https://github.com/neiman-marcus/serverless-provisioned-concurrency-autoscaling/tree/master/CONTRIBUTING.md). - All contributions must follow our code of conduct. See [CONDUCT.md](https://github.com/neiman-marcus/serverless-provisioned-concurrency-autoscaling/tree/master/CONDUCT.md). - This project is licensed under the Apache 2.0 license. See [LICENSE](https://github.com/neiman-marcus/serverless-provisioned-concurrency-autoscaling/tree/master/LICENSE). ## Acknowledgments - [serverless-dynamodb-autoscaling](https://github.com/sbstjn/serverless-dynamodb-autoscaling) - Original plugin this module is based on.