feat(monitoring): only include regional aggregations on selected SLIs

Andrew Newdigaterequested to merge
conditional-regional-aggregation into master

At present, we calculate regional SLI metrics for all services, whether or not they run regionally.

This change limits SLI aggregations to regional services - currently websocket, git, registry.

This should slightly reduce load on our Thanos Ruler, but more importantly ensures that once we add regional alerting, we won't get regional SLO violation alerts for non-regional components (ie, stuff running in VMs)

Edited by Andrew Newdigate

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