On the postevent documentation where it has prop_name it references the documentation on the properties but gives no links. "Set an arbitrary (but restricted) meta-data property to this log item. See the document on properties for the discussion of them and the list of valid names. You may send zero or more keys like this, one for each property you're setting."
What I'm looking for is the list of properties. I was able to figure out a few from looking at the source code on the web based update page, but I cannot find a complete list anywhere in the developers area, FA, or help sections.
If someone could point me in the right direction or give me a list of properties I'd be much obliged.