Storage control plane metrics

[nachocano]

Helps with knative/eventing#1693

• Adding control plane metrics for storage

[nachocano]

/assign @n3wscott

[knative-prow-robot]

Hi @nachocano. Thanks for your PR.

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[n3wscott]

/lgtm
/approve
/ok-to-test

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: n3wscott, nachocano

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