[influxdb] Create custom tags

[orenshvalb via InfluxData]

Hello,

I'm new to Kapacitor and I have a question regarding adding field name as a tag.
In my Inlflux table I have few tags and many fields.
I created a TICK file and according to a specific field value I'm created a threshold that posts and alert.

I'm able to get the field value by doing:

|eval(lambda: "CE")
.as('value')

But I can't figure out how to add the name of the field ("CE") to the `tags` block.

Is that possible?

Thanks you.
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