Consider how Registry CDN should contribute to aggregated/component service level indicators.

In &657 (closed) we are introducing a new infrastructure component, a CDN load balancer in front of Registry. Currently this component is not taken into consideration as part of our aggregated service level metrics.

Because this is a Google load balancer we are limited to StackDriver exporter metrics, we have the following metrics:

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More generally, we need to be sure we are alerted (SRE is paged) if the CDN stops functioning altogether. I think there will be two parts to this:

  1. Decide if we should create a cdn/storage component with key metrics
  2. Decide if we should incorporate the CDN into our aggregated service level indicators