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⚡️ 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.

Usage

Add the NPM package 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.

$3


`yaml
functions:
hello:
handler: handler.hello
provisionedConcurrency: 1
concurrencyAutoscaling: true
`

$3

`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 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.

$3

`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.

$3

For more details on Scheduled Actions formats see
the AWS CloudFormation ScheduledAction description.

#### 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
* AWS Schedule Expressions for Rules (cron)
* AWS Put Scheduled Action - Timezone

| 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
- Dawid Boissé

Contributors

- Vinoth Kumar Chandrasekar

Conduct / Contributing / License

- Refer to our contribution guidelines to contribute to this project. See CONTRIBUTING.md.
- All contributions must follow our code of conduct. See CONDUCT.md.
- This project is licensed under the Apache 2.0 license. See LICENSE.

Acknowledgments

- serverless-dynamodb-autoscaling - Original plugin this module is based on.