// This is my script
var today_trips = batch
    |query(''' 
            SELECT count(count) as count 
            FROM "product"."default".leads
            ''')
        .period(24h)
        .cron('28 18 * * * *')
    |log()

var yesterday_trips = batch
    |query(''' 
            SELECT count(count) as count
            FROM "product"."default".leads
            WHERE "time" < now() - 1d
           ''')
        .period(48h)
        .cron('28 18 * * * *')
    |log()

today_trips
    |join(yesterday_trips)
        .as('today_trips', 'yesterday_trips')
        .tolerance(48h)
        .fill(0.0)
    |eval(
        lambda: int("today_trips.count"),
        lambda: int("yesterday_trips.count"),
        lambda: float(100.0 * float(float("today_trips.count" - 
"yesterday_trips.count") / float("yesterday_trips.count")))
    )
        .as('today_trip', 'yester_trip', 'perc')
    |log()
    |alert()
        .id('Lead creation Dip/Increase alert Task Name : {{ .TaskName }}')
        .message('{{ .ID }},  Alert Time : {{.Time}}')
        .details('''
          <h4>{{ .Message }}</h4>
          <p>Total Trip Created in last 24 hours: {{ index .Fields 
"today_trip"  }}</p>
          <p>Total Trip Created in last 24 to 48 hours: {{ index .Fields 
"yester_trip"  }}</p>
          <p>Trip Dip/Increase: {{ index .Fields "perc" | printf "%0.2f" 
}}% </p>      
  ''')
        .info(lambda: "perc" < -1.0 OR "perc" > 1.0)
        .log('/var/log/kapacitor/kapacitor.log')


Log of this Script
Log 1--  when data point  joined 
[leads:log2] 2016/09/13 17:37:00 I!  {leads 2016-09-13 17:37:00 +0000 UTC 
 false map[] [{2016-09-12 17:37:00 +0000 UTC map[count:2653] map[]}]}
[leads:log4] 2016/09/13 17:37:00 I!  {leads 2016-09-13 17:37:00 +0000 UTC 
 false map[] [{2016-09-11 17:37:00 +0000 UTC map[count:2295] map[]}]}
[leads:log8] 2016/09/13 17:37:00 I!  {leads 2016-09-14 00:00:00 +0000 UTC 
 false map[] [{2016-09-12 00:00:00 +0000 UTC map[perc:15.59912854030501 
today_trip:2653 yester_trip:2295] map[]}]}


Log 2 --  when data point not joined 
[leads:log2] 2016/09/14 19:22:00 I!  {leads 2016-09-14 19:22:00 +0000 UTC 
 false map[] [{2016-09-13 19:22:00 +0000 UTC map[count:2261] map[]}]}
[leads:log4] 2016/09/14 19:22:00 I!  {leads 2016-09-14 19:22:00 +0000 UTC 
 false map[] [{2016-09-12 19:22:00 +0000 UTC map[count:2666] map[]}]}
[leads:log8] 2016/09/14 19:22:00 I!  {leads 2016-09-15 00:00:00 +0000 UTC 
 false map[] [
{2016-09-12 00:00:00 +0000 UTC map[today_trip:0 yester_trip:2666 perc:-100] 
map[]} {2016-09-15 00:00:00 +0000 UTC map[yester_trip:0 perc:+Inf 
today_trip:2261] map[]}]}


why this batch query joins some time but same batch query not join
Can you also explain how tolerance round up time stamp

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