This is a Bug Report

Description

When running sls deploy with a configuration that includes an alarms property on a function, the service configuration validation process throws a Configuration error saying the property is unrecognised.

This error doesn’t seem to affect functionality - the specified alarms work when deployed.

It does prevent use of the stricter configValidationMode: error, because deployments are aborted when errors are raised in that setup.

I don’t have experience writing serverless plugins, but there is documentation for extending the validation schema and it looks like the specific api is defineFunctionProperties.

For bug reports:

• What went wrong? A Configuration error is thrown.
• What did you expect should have happened? No errors should occur.
• What was the config you used? Relevant snippet:

plugins:
  - serverless-plugin-aws-alerts

# ...

custom:
  alerts:
    topics:
      critical:
        alarm:
          topic:
            criticalalertsnstopic
      nonCritical:
        alarm:
          topic:
            notificationsnstopic
    definitions:
      criticalFunctionErrors:
        namespace: 'AWS/Lambda'
        metric: Errors
        threshold: 20
        statistic: Sum
        period: 60
        evaluationPeriods: 1
        comparisonOperator: GreaterThanOrEqualToThreshold
        alarmActions:
          - critical
      functionErrors:
        alarmActions:
          - nonCritical
      functionThrottles:
        alarmActions:
          - nonCritical
    alarms:
      - functionErrors
      - functionThrottles
      - 
# ...

  myFunction:
    name: my_function
    handler: handlers.handle_my_function
    alarms:
      - criticalFunctionErrors
# ...

• What stacktrace or error message from your provider did you see?

  Serverless Error ---------------------------------------
 
  Configuration error: 
       at 'functions.myFunction': unrecognized property 'alarms'
 
  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          github.com/serverless/serverless/issues
     Issues:        forum.serverless.com
 
  Your Environment Information ---------------------------
     Operating System:          darwin
     Node Version:              12.14.1
     Framework Version:         2.28.7 (local)
     Plugin Version:            4.4.3
     SDK Version:               2.3.2
     Components Version:        3.7.2