Calculate percentile on metric value

[Druson]

Is your feature request related to a problem? Please describe.

• In some cases the logs contains duplicate log line (but with different timestamp), I want to dedup it firstly then calculate the percentile.

Describe the solution you'd like

• Similar to https://prometheus.io/docs/prometheus/latest/querying/functions/#histogram_quantile E.g.

histogram_quantile(0.95, first_over_time({service_name="xxx"}|=`response`|=`duration=`|unwrap duration[$__auto]) by(request_id) )

Describe alternatives you've considered

• use recording rule.

Additional context

• N/A.