Kapaccitor mem leak

Now, my kapacitor server is 30GB RAM (monitor about 200 host ). Mem-leak error lead to each 7 day it been restart. I’m try troubleshot log but found nothing.

this alert make mem leak, i doubt . can you take a look?

var db = 'telegraf'

var rp = 'autogen'

var measurement = 'system'

var groupBy = ['customer', 'environment', 'project', 'host']

var whereFilter = lambda: TRUE

var name = 'os_cpu_loadaverage_high'

var idVar = name + '-{{.Group}}'

var message = 'CPU Load average on host {{ index .Tags "host" }}  is {{ index .Fields "value" | printf "%0.2f" }} %'

var idTag = 'alertID'

var levelTag = 'level'

var messageField = 'message'

var durationField = 'duration'

var triggerType = 'threshold'

var info = 75

var warn = 90

var data1 = stream
    |from()
        .database(db)
        .retentionPolicy(rp)
        .measurement(measurement)
        .groupBy(groupBy)
        .where(whereFilter)
    |window()
        .period(1m)
        .every(30s)
        .align()
    |mean('load5')
        .as('mean_load5')

var data2 = stream
    |from()
        .database(db)
        .retentionPolicy(rp)
        .measurement(measurement)
        .groupBy(groupBy)
        .where(whereFilter)
    |window()
        .period(1m)
        .every(30s)
        .align()
    |mean('n_cpus')
        .as('mean_cpus')

var data = data1
    |join(data2)
        .as('m1', 'm2')
    |eval(lambda: "m1.mean_load5" / "m2.mean_cpus" * 100.0)
        .as('value')

var trigger = data
    |alert()
        .warn(lambda: "value" < warn)
        .info(lambda: "value" > info)
        .message(message)
        .id(idVar)
        .idTag(idTag)
        .levelTag(levelTag)
        .messageField(messageField)
        .durationField(durationField)
        .stateChangesOnly(30s)
        .log('/tmp/alerts.log')

Currently, it trigger about 30 times per minute with my series data, (about 200 host) . but how it mem leak kapacitor?

AND, I look at the guide kapacitor and found in frequently-asked-questions :

https://docs.influxdata.com/kapacitor/v1.5/troubleshooting/frequently-asked-questions/#how-does-kapacitor-handle-high-load

So it say: I must fix my stream script by add window node in it? Do i get it right?