UPSTREAM <carry>: Add range response KV length as a metric

[tjungblu]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[tjungblu]

/hold

testing this out for alerting possibilities

[openshift-ci]

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[Elbehery]

good addition 👍🏽

[openshift-ci]

@tjungblu: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-etcd-recovery	01fd2cc	link	false	/test e2e-aws-etcd-recovery

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[Elbehery]

@tjungblu do u need lgtml here ? ..

i see /hold above

[Elbehery]

@tjungblu do we need this or close it ?

[openshift-bot]

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[openshift-bot]

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