This came from a Graylog user outside the community:
I am looking to set up a spreadsheet type of display of raw logs that are critical or warning levels. When a log has been reviewed, I would like the ability to hide it. Also able to color code lines based on severity would be nice.
But seriously thou, I manipulate the Widget called " Message Table"
Then Highlighted what I wanted (i.e., Error, WARNING, etc…) You can refine this more by setting up a stream to only allow ERROR/WARN messages in, then create a saved search/Dashboard through that stream. Which can be attached to a Alert
EDIT: I forgot, to change colors, edit the widget and on the left side you can change the color/s if need be.