// histogram_quantile(
// 0.90,
// sum by (method, path, le) (
// rate(
// http_request_duration_seconds_bucket{
// code=~"[123].."
// }[5m]
// )
// )
// )
// this 0.9 is related to the LE bucket stored in the histogram's tags
test:http_request_duration_seconds_bucket
| where code == #/[123]../
| bucket by method, path to 5m using interpolate_delta_histogram(0.90, max, 0.99)