Macro ticket: create new scaler for AODH.

[robsondepaula]

Before starting refer to CREATE-NEW-SCALER.md to learn how to create a new scaler in Keda.

In Openstack AODH is similar to AWS Cloudwatch.

• Scaler Source: https://www.openstack.org/software/releases/victoria/components/aodh
• How do you want to scale: scale out or in based on defined metrics. Please check https://keda.sh/docs/2.0/scalers/azure-monitor/ for similar behavior.
• Authentication: investigate how authentication is done for AODH. If required this also need to be implemented.

Expected Results:

• Clarify the steps needed to create a new scaler for SWIFT
• Know how to automate tests
• Document the feature
• Create more tickets to support this development with the help of more project members

[Rodolfodc]

Identified steps do develop AODH scaler for Keda

1. Create with GO a function/object, library or just a code component to be reused.
2. Develop Keda scaler based on Keda instructions for Keda scaler building
3. If possible improve the component so it will be the only responsible for OpenStack interaction management and would make future scalers development easier.
4. Integrate all development to keda environment, build and test

[Rodolfodc]

For the possibilities on authentication refer to : https://github.com/sidilabs/keda/issues/14#issuecomment-729111297