Deadman alert fails for some hosts

Hi,

I have a pool of servers and I am gathering metrics from then and putting into an InfluxDB.
Now I created a deadman alert on chronograf that sends me alerts by email when one of my servers fail

but I think something is wrong

I always receive alerts about one of my servers that’s working fine
On the other hand, I’m not receiving alerts about some others servers when they’re down

What I must to do ?

My config
```
var db = 'telegraf'

var rp = 'XXX'

var measurement = 'cpu'

var groupBy = ['host']

var whereFilter = lambda: TRUE

var period = 10m

0s

var name = 'Server Down Alert'

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

var message = 'SERVER FAIL {{ index .Tags "host" }}'

var idTag = 'alertID'

var levelTag = 'level'

var messageField = 'message'

var durationField = 'duration'

var outputDB = 'chronograf'

var outputRP = 'autogen'

var outputMeasurement = 'alerts'

var triggerType = 'deadman'

var threshold = 0.0

var data = stream
|from()
.database(db)
.retentionPolicy(rp)
.measurement(measurement)
.groupBy(groupBy)
.where(whereFilter)

var trigger = data
|deadman(threshold, period)
.message(message)
.id(idVar)
.idTag(idTag)
.levelTag(levelTag)
.messageField(messageField)
.durationField(durationField)
.stateChangesOnly()
.email()
.to('XXX@XXX')

trigger
|eval(lambda: "emitted")
.as('value')
.keep('value', messageField, durationField)
|eval(lambda: float("value"))
.as('value')
.keep()
|influxDBOut()
.create()
.database(outputDB)
.retentionPolicy(outputRP)
.measurement(outputMeasurement)
.tag('alertName', name)
.tag('triggerType', triggerType)

trigger
|httpOut('output')
```

No repository file or test is named. Begin with the supplied Kapacitor deadman configuration, especially the host grouping, period, and stream source, and reproduce the differing behavior for reporting and non-reporting hosts. Done means identifying the cause and documenting or fixing it with a regression test.

Written by the indexing model from the issue text.