code: func (t *Target) offset(interval time.Duration, jitterSeed uint64) time.Duration {
  	now := time.Now().UnixNano()
  
  	// Base is a pinned to absolute time, no matter how often offset is called.
  	var (
  		base   = int64(interval) - now%int64(interval)
  		offset = (t.hash() ^ jitterSeed) % uint64(interval)
  		next   = base + int64(offset)
  	)
  
  	if next > int64(interval) {
  		next -= int64(interval)
  	}
  	return time.Duration(next)
  }
docs: // offset returns the time until the next scrape cycle for the target.
  // It includes the global server jitterSeed for scrapes from multiple Prometheus to try to be at different times.