There are several ways to organize issues including filing them under projects, categories, and tags. An issue can belong to one category and one project at any point in time. However, an issue can have zero or more tags. This enables flexibility in classifying issues for more than one purpose.
Tags provide the following features:
- An issue can have zero or more tags.
- Tags are organic, can be defined and used on the fly by any user and used on any issue.
- Tags can be used to filter issues.
Some good examples of tags include:
- patch - this issue has a patch attached.
- localization - the solution for this issue will require localization work.
You should think of tags as the equivalent of hash tags in Twitter. It is just a light weight way to classify and filter issues.