feat: Support for single query splunk ratio SLOs [PC-13052]

[dawidwisn]

Motivation

Support for single query splunk ratio SLOs

Summary

Example:

  objective {
    display_name = "obj1"
    name         = "tf-objective-1"
    primary      = false
    target       = 0.7
    time_slice_target = 0
    value        = 1
    count_metrics {
      incremental = true
      good_total {
		splunk {
		  query = "mstats avg(\"spl.intr.resource_usage.IOWait.data.avg_cpu_pct\") as n9good WHERE index=\"_metrics\" span=15s join type=left _time [mstats avg(\"spl.intr.resource_usage.IOWait.data.max_cpus_pct\") as n9total WHERE index=\"_metrics\" span=15s] rename _time as n9time fields n9time n9good n9total "
		}
      }
    }
  }

Release Notes

Support for single query splunk ratio SLOs