Github user rstjohn commented on the pull request:
https://github.com/apache/nifi/pull/256#issuecomment-220020450
We are heavy users of Slack and find this processor very useful.
Below are a few changes that we would like to see:
* Do not make WebHook a sensitive value. It makes it hard to use in
templates
* Update the channel validation to work better with expression language.
Currently, the field must start with a # or @. However, our expression
language variable is responsible to setting the destination. It could be
either an @ or a #. We don't know until runtime. You could default prepend a
# unless the expression language evaluation starts with @.
* Allow dynamic properties to populate the "attachments" json field from
the Slack API. This allows greater customization of the posted message.
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