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When i have 600 scaledobject, every scaledobject have a prometheus trigger, it have create more than 500 http connection.We can set disableKeepAlives to be false when create client，as hpa only have only little goroutine to get metrics.

Expected Behavior

Actual Behavior

Steps to Reproduce the Problem

1. 600 scaledobject, every scaledobject have a prometheus trigger

KEDA Version

2.8.1

Kubernetes Version

1.20.11