Method addTag will associate a "tag" with this application. Applications can have an unlimited number of tags.
Tags allow applications to be searched and organized by management tools.
Tag values are opaque, but adopting a simple convention of 'category:value' allows for complex use cases.
Some recommendations for categories are:
- cluster: - the cluster name the application is or should be run against. A name could be logical, like QA or PROD.
- project: - the project name, possibly a JIRA project name this application is managed under.
- org: - the group, team or organization that is responsible for the application.
- support: - the email address of the user who should be notified of failures or issues.
Note that tags should not contain whitespace characters, even though this is not an error, a warning will be
issues.