Deadman alert not showing hostname details ({{index .tags "tagname"}} not working)

Hi,

I’m using the below tick script to generate deadman alert.

var data = stream
|from()
.database(‘telegraf’)
.retentionPolicy(‘autogen’)
.measurement(‘system’)
.groupBy(‘host’)

data
|deadman(0.0, 1m)
.id(’{{ index .Tags “host”}}’)
.message(‘Server {{ .ID }} is OFFLINE’)
.log(’/var/log/deadman.log’)
.stateChangesOnly(5m)

The issue am facing here is am not getting host information from the alert. It trigger the alert like below.

“id”: “”,
“message”: “Server is OFFLINE”,

I made ID as " .id(’{{ index .Tags }}’)", and noe it changed like

“id”: “map[]”,
“message”: “Server map[] is OFFLINE”,

I don’t understand what went wrong here. Can anyone please help me to resolve this issue?

I'm using kapacitor version 1.5.2
I found a similar issue https://github.com/influxdata/chronograf/issues/3542 but it's still open.

Start with the provided Kapacitor tick script, focusing on the deadman alert's .id and .message expressions and the reported behavior on version 1.5.2. Compare the result with the linked Chronograf issue; done means the alert output includes the grouped host name instead of an empty value or map[].

Written by the indexing model from the issue text.