https://keda.sh/

https://github.com/kedacore/keda
https://github.com/kedacore/keda/blob/main/pkg/scaling/scalers_builder.go

az-service-bus
https://keda.sh/docs/2.11/scalers/azure-service-bus/
https://github.com/kedacore/keda/blob/main/pkg/scalers/azure_servicebus_scaler.go
https://github.com/kedacore/keda/blob/main/pkg/scalers/azure_eventhub_scaler_test.go

2021
https://learnk8s.io/scaling-celery-rabbitmq-kubernetes