Hi @gardz - welcome to the community and thanks for the feedback.
Thanks for the suggestion around Slack. User feedback is key part of how we prioritize what we work on, so creating this thread is a good first step. The more people that show interest in a feature, the more likely it is to get prioritized. As such, we’ll leave this thread open for further community feedback.
SMS, Email, Pushbullet, and Pushover are all popular in the end-user space which is why those got prioritized as notification options. I’m under the impression that Slack tends to get used more in the organizational / company space, but we’re always open to implement it if there’s enough community interest!
HTTP / REST API actions within the Rule Engine are certainly on our list. We haven’t had a lot of requests for it yet, so it hasn’t quite bubbled to the top of the list and we’ve been prioritizing other highly requested features in the meantime. 