Add 30s offset to sli_aggregations:* rules
Add 30s offset to sli_aggregations: rules*
This offset will allow us to avoid a race condition where not all information in a numerator/denominator combination is not yet available when the rule is evaluated.
The 30s offset adds a delay, so that any metrics that come in late (with a timestamp in the past) would be part of the recording. This makes the numerator and denominator data a closer match most of the time, taking care of some deviations we've seen in ratio calculations used in alerts and error budgets for stage groups.
This is a stop-gap solution discussed in gitlab-com/gl-infra/scalability#2478 (closed)