If you change the state of an object there is a message (Item state changed) shown. Is there an option to suppress or disable workflow state messages?
Drop it via a diazo rule, that would be my first option.
You could maybe go to http://yoursite//manage-viewlets
And hide global status messages.
If you just want to hide some of them, I would do it with CSS
Sorry, no diazo here
In my case it's a custom workflow. Is maybe there an option to disable notifications somehow? Next step is to dig into workflow notifications and filter only them. Any ideas/hints on that?
Override the Viewlet and check your Conditions in the "enabled" Method.
Slightly related: Status message with links (note: mtype )