Allow passing more arguments to the log forwarder

[plumdog]

Expected Behavior

The template at https://github.com/DataDog/cloudformation-template/blob/master/aws/main.yaml has a resource ForwarderStack that wraps the forwarder which I believe comes from https://github.com/DataDog/datadog-serverless-functions/blob/master/aws/logs_monitoring/template.yaml.

I want to be able to pass parameters to the forwarder stack, eg ExcludeAtMatch to filter out some less useful logs, namely the START/END/REPORT chatter from Lambda.

Actual Behavior

Cannot configure the Log Forwarder other than the function name, Datadog site and API key to use.

Possible solutions

• Add lots of parameters to the template in this repo to allow full customisation of the Forwarder stack.
• Add an option to not deploy the forwarder in this template, but support deploying it separately.
• Is there a different way of filtering the logs that are shipped from Lambda to Datadog? In my case, these are the "platform" logs from Lambda, not from my application code.

[sunshineo]

+1, we need to change the memory size of the lambda