Tagging messages

I would like to be able to add Tags to messages. These would be displayed in the clients. Tapping a tag would lead me to a filtered view showing only messages with this particular Tag.

Tags could be pushed as a comma separated list.

An exemplary use case would be server monitoring, where each message contains the service name, host name and data center name as tags. This would make it more easy to show messages regarding a particular thing without manually typing it to search in the message content.