Ability to send metrics to VPC endpoint

[jlosito]

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Describe the Feature

I would like to send metrics to a VPC endpoint instead of sending metrics to the public API.

Expected Behavior

I expect the ability to ship metrics to CloudWatch over a private network where the instance does not have the ability to reach the public endpoint over the Internet.

Use Case

I have EC2 instances that do not have access to the public internet. The EC2 instances are in a private subnet and they do not have a NAT gateway in order to reach the Internet. This EC2 instance has a service that is exposing prometheus styled metrics that I would like to ship to CloudWatch, but would need to be done over the private network through a VPC endpoint.

Describe Ideal Solution

I would like the ability to add the VPC endpoint as a parameter so that the cloudwatch client is able to put metrics into CloudWatch over the private network. I believe this would be achieved by setting the Endpoint option linked below.

https://docs.aws.amazon.com/sdk-for-go/api/aws/client/#ConfigProvider

It appears that the CloudWatch client is being set here, and this is where the Endpoint option might have to be set.
https://github.com/cloudposse/prometheus-to-cloudwatch/blob/master/prometheus_to_cloudwatch.go#L136-L196

Alternatives Considered

Explain what alternative solutions or features you've considered.

Additional Context

Add any other context or screenshots about the feature request here.