Kapacitor can be a bit tricky sometimes. For this issue, could you tell us a little bit more information, specifically what you mean by
group similar alerts into a single notification
If what you mean is that you don’t want repeated alerts of the same content, then adding a
could resolve the issue. This would basically result in notification only when the state/status has changed. Try taking a look at the docs on it for further clarification.
If I’ve misunderstood, please let me know and we can find another solution.