Get analytics summary for multiple checks

Returns availability, response times, and latency metrics for the given checks. Response shape is polymorphic per check type: fields are present only when the metric applies to that type. A null value means no data in the requested time range; an absent field means the metric does not apply to that check type. Currently only quickRange is supported for time filtering. Arbitrary from/to date ranges are not yet supported but may be added in a future release. Rate-limiting is applied to this endpoint, you can send 30 requests / 60 seconds at most.