Templates in InfluxDBOutNode tag

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Hi,

I am trying to use the InfluxDBOutNode to write the results of my tick script back to InfluxDB, and I would like to add a tag that indicates the task who wrote the line,
something like this:

```
var data = stream
|from()
.measurement('cpuStats')
|groupBy('host')
|window()
.period(1h)
.every(1m)
|mean('idle')
|eval(lambda: int(100.0 - "mean"))
.as('load')

//Send alert
data
|alert()
...

//Save data to influxdb for dashboard
data
|influxDBOut()
.database('clusterStatus')
.retentionPolicy('default')
.measurement('cpuStatus')
.tag('kapacitor', 'true')
.tag('cluster_task', '{{ .TaskName }}')
```

unfortunately, this writes "{{ .TaskName }}" in the database, instead of e.g. "cpu_monitor_task".

Is there another way to do this?

Start at the InfluxDBOutNode and the influxDBOut() call shown in the example, then trace how tag values are handled. Determine the intended template context and define what output should be written for a task name; no test or implementation file is identified in the issue.

Written by the indexing model from the issue text.