@dudousxd/nestjs-telescope/dist/metrics/timeseries.js

Laravel Telescope-style observability console for NestJS — core: watchers, recorder, correlation, SQLite store, headless API.

/** Group entries into `bucketCount` equal time buckets across [windowStart,
 *  windowEnd], counting total + per-type per bucket. Pure: callers fetch the
 *  windowed entries. Out-of-range entries are clamped into the edge buckets. */
export function bucketTimeseries(entries, windowStart, windowEnd, bucketCount) {
    const count = Math.max(1, Math.floor(bucketCount));
    const startMs = windowStart.getTime();
    const spanMs = Math.max(1, windowEnd.getTime() - startMs);
    const bucketMs = Math.max(1, Math.floor(spanMs / count));
    const buckets = Array.from({ length: count }, (_, index) => ({
        t: new Date(startMs + index * bucketMs).toISOString(),
        total: 0,
        byType: {},
    }));
    for (const entry of entries) {
        const offset = entry.createdAt.getTime() - startMs;
        const rawIndex = Math.floor(offset / bucketMs);
        const index = Math.min(count - 1, Math.max(0, rawIndex));
        const bucket = buckets[index];
        if (!bucket)
            continue;
        bucket.total += 1;
        bucket.byType[entry.type] = (bucket.byType[entry.type] ?? 0) + 1;
    }
    return {
        windowStart: windowStart.toISOString(),
        windowEnd: windowEnd.toISOString(),
        bucketMs,
        buckets,
    };
}
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