Time_utils.LatencyLatency measurement utilities
type measurement = {start_ns : timestamp_ns;end_ns : timestamp_ns;duration_ns : duration_ns;label : string;}val create_tracker : unit -> trackerval start_measurement : tracker -> string -> unitval end_measurement : tracker -> measurement optionval get_measurements : tracker -> measurement listval clear_measurements : tracker -> unitval measure_function : string -> (unit -> 'a) -> 'a * measurementval get_statistics : measurement list -> latency_stats option