can kapacitor tickscript read bash environment variable?

var message = ' nginx active connections is in {{.Level}}, value is {{ index .Fields "value" }} from $HOST'

I want to send alert with $HOST so that we know where is the alert coming from, I think this is the basic requirement for any alerting system, zabbix, cacti, nagios can read environment variable very easily.

Thanks.

No source files, tests, or implementation entry points are named. Start with Kapacitor's TICKscript alert message shown in the issue and investigate how alert templates handle environment variables; done would require a decided approach and documented or tested support for including the host value.

Written by the indexing model from the issue text.