Serverless AWS Alerts Plugin

A Serverless plugin to easily add CloudWatch alarms to functions

Installation

npm i serverless-plugin-aws-alerts

Usage

service: your-service
provider:
  name: aws
  runtime: nodejs4.3

custom:
  alerts:
    stages: # Optionally - select which stages to deploy alarms to
      - producton
      - staging
    topics:
      ok: ${self:service}-${opt:stage}-alerts-ok
      alarm: ${self:service}-${opt:stage}-alerts-alarm
      insufficientData: ${self:service}-${opt:stage}-alerts-insufficientData
    definitions:  # these defaults are merged with your definitions
      functionErrors:
        period: 300 # override period
      customAlarm:
        namespace: 'AWS/Lambda'
        metric: duration
        threshold: 200
        statistic: Average
        period: 300
        evaluationPeriods: 1
        comparisonOperator: GreaterThanThreshold
    global:
      - functionThrottles
      - functionErrors
    function:
      - functionInvocations
      - functionDuration

plugins:
  - serverless-plugin-aws-alerts

functions:
  foo:
    handler: foo.handler
    alarms: # merged with function alarms
      - customAlarm
      - name: fooAlarm
        namespace: 'AWS/Lambda'
        metric: errors # define custom metrics here
        threshold: 1
        statistic: Minimum
        period: 60
        evaluationPeriods: 1
        comparisonOperator: GreaterThanThreshold

SNS Topics

If topic name is specified, plugin assumes that topic does not exist and will create it. To use existing topics, specify ARNs instead.

Metric Log Filters

You can monitor a log group for a function for a specific pattern. Do this by adding the pattern key. You can learn about custom patterns at: http://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/FilterAndPatternSyntax.html

The following would create a custom metric log filter based alarm named barAlarm. Any function that included this alarm would have its logs scanned for the pattern exception Bar and if found would trigger an alarm.

custom:
  alerts:
    function:
      - name: barAlarm
        metric: barExceptions
        threshold: 0
        statistic: Minimum
        period: 60
        evaluationPeriods: 1
        comparisonOperator: GreaterThanThreshold
        pattern: 'exception Bar'
      - name: bunyanErrors
        metric: BunyanErrors
        threshold: 0
        statistic: Sum
        period: 60
        evaluationPeriods: 1
        comparisonOperator: GreaterThanThreshold
        pattern: '{$.level > 40}'

Note: For custom log metrics, namespace property will automatically be set to stack name (e.g. fooservice-dev).

Default Definitions

The plugin provides some default definitions that you can simply drop into your application. For example:

alerts:
  global:
    - functionThrottles
    - functionErrors
  function:
    - functionInvocations
    - functionDuration

If these definitions do not quite suit i.e. the threshold is too high, you can override a setting without creating a completely new definition.

alerts:
  definitions:  # these defaults are merged with your definitions
    functionErrors:
      period: 300 # override period

The default definitions are below.

definitions:
  functionInvocations:
    namespace: 'AWS/Lambda'
    metric: Invocations
    threshold: 100
    statistic: Sum
    period: 60
    evaluationPeriods: 1
    comparisonOperator: GreaterThanThreshold
  functionErrors:
    namespace: 'AWS/Lambda'
    metric: Errors
    threshold: 10
    statistic: Maximum
    period: 60
    evaluationPeriods: 1
    comparisonOperator: GreaterThanThreshold
  functionDuration:
    namespace: 'AWS/Lambda'
    metric: Duration
    threshold: 500
    statistic: Maximum
    period: 60
    evaluationPeriods: 1
    comparisonOperator: GreaterThanThreshold
  functionThrottles:
    namespace: 'AWS/Lambda'
    metric: Throttles
    threshold: 50
    statistic: Sum
    period: 60
    evaluationPeriods: 1
    comparisonOperator: GreaterThanThreshold

License

MIT © A Cloud Guru