/** When a job finished and how long its last run took, from its timestamps. */
export type RunSample = {
    at: number;
    ms: number;
};
export type RunTimeSummary = {
    /** Jobs that finished inside the window. */
    count: number;
    p50: number | null;
    p95: number | null;
    /** The median run time in each equal slice of the window, oldest first;
     *  null where nothing finished. */
    buckets: Array<number | null>;
};
/** Nearest-rank percentile of an ascending list: always a real run time. */
export declare const percentile: (sorted: readonly number[], fraction: number) => number | null;
export declare const summarizeRunTimes: (runs: readonly RunSample[], { now, minutes, buckets }: {
    now: number;
    minutes: number;
    buckets: number;
}) => RunTimeSummary;
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