Create use-case about how to scale workloads with KEDA

[odubajDT]

Goal

Create a use-case in the docs/docs/use-cases folder and describe how to use KeptnMetrics exposed via custom metrics API for scaling workloads using KEDA.

Details

There should be a use-case to showcase Keptn integration with KEDA. First do a research how exactly KEDA connects with the custom metrics API and how the scaling works. Write down your findings in a nice use-case and place it in the documentation.

DoD

• complete the research on how to integrate Keptn and KEDA and how workloads scalling works
• write down the research findings in a use-case to help users with integrations

Useful links

• https://keda.sh/
• https://keda.sh/docs/2.12/scalers/metrics-api/
• https://kubernetes.io/docs/reference/external-api/custom-metrics.v1beta2/

[mowies]

The team agreed to split off the integration test task of this ticket into a new ticket.