ref(autoscaling): add prefix to autoscaling metrics #17460

Job	Run time
Setup build metadata	1s
Lint	4m 0s
Lint Rust Default Features	1m 14s
detect what files changed	3s
Test (macos-latest)	2m 47s
Test (windows-latest)	5m 27s
Test All Features (ubuntu-latest)	2m 53s
Integration Tests	8m 23s
Test Python	1m 15s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	6m 39s
validate-devservices-config	0s
Build Docker Image (relay)	31s
self-hosted-end-to-end	8m 30s
Publish Relay to GCR	0s
Upload build artifacts to gocd	0s
Publish Relay to DockerHub	0s
Sentry-Relay Integration Tests	9m 53s
	51m 36s

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