But a tag is only as good as the information that it helps to find. Consequently, I have started to describe error cases inside the knowledge base's event repository:
So far, there is only a limited set of messages available (to phrase it politely ;)), but I plan to increase it over time. Note that there is an interactive feature where questions to the message can directly be posted to the forum. I hope this is useful.
If you run into an error message that is not-yet described, let us know and we'll add an entry. In the long term, the new knowledge base part should be able to solve most problems.