Add max number of invocations per function

[teddy-codes]

Within the google cloud CLI, we are able to specify --max-instances, but within serverless I cannot find an option to do so.

Reference: https://cloud.google.com/functions/docs/max-instances

[profoundpanda]

You can add maxInstances in the serverless.yaml file now.

eg:

functions:
  my-function:
     handler: my-exported-function-name
     events: 
        - http: path
     maxInstances: 10