Kapacitor not repeat alert

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Hi!,
I have kapacitor with a alert and window time.... but not repeat alert when repeat proccess

**Steps:**
Active my alert with 50% disk...
**Expected result:**
I expected alert every 1min or other value enter on "every([value])"
**Actual result:**
One message of alert but not repeat message....

**Additional information:**
```
stream
|from()
.database('telegraf')
.measurement('disk')
|window()
.period(5m)
.every(1m)
|alert()
.crit(lambda: "used_percent" > 50.0)
.message('@all {{ .ID }} is {{ .Level}}')
.log('/tmp/alerts.log')
.hipChat()
```

Start by running the provided stream configuration with a disk value above 50% and observe whether the alert repeats at the one-minute window interval. Compare the actual notifications with the expected repeated messages; done means determining why repeat behavior differs from the configured every(1m) interval and documenting or correcting the result.

Written by the indexing model from the issue text.