Allow for SLO-Grouping by e.g. Prefix

[szczepad-colenio]

It should be possible to Group SLOs e.g. related to performance or availability, so that a summarized metric is shown.

E.g. the metrics
availability-google-com | 99%
availability-zalando-com | 99%
availability-test-com | 90%

Should result in a availability-Metric with 96%

[mkoertgen]

What would be the resulting promql?

Next, what would be the aggregate? From the example, it looks like assuming the standard average (and even weights).

It is likely that one would want to specify that Availability of 1) "google.com" will be more critical than that of 2) "zalando.com", which in turn will again be more critical than that of 3) "test.com".

Would it not be possible to express the slo by label and use pyrra-grouping-feature?