function getActivity(tl){
    var buckets = [
        0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    ]

    for(var i = 0; i < tl.length; i++){

        if (tl[i].event_type == "Engagement Management") continue; // That's not the attacker working, so we don't want to have it in our histogram

        var date = new Date(tl[i].date_time)
        hour = date.getHours()
        buckets[hour]++

    }

    console.log(buckets)

    return buckets
}
Create a histogram based on event data, do not include engagement management
@param tl - Timeline array
@returns {number[]} - Number of events