We use the following check_message in:

horizon/exceptions.py
openstack_dashboard/dashboards/admin/aggregates/workflows.py
openstack_dashboard/dashboards/admin/flavors/workflows.py
openstack_dashboard/dashboards/admin/info/tabs.py
openstack_dashboard/dashboards/project/cgroups/workflows.py
openstack_dashboard/dashboards/project/volume_groups/workflows.py

The definition is:

96 def check_message(keywords, message):                                                                                                                                                                                                     
197     """Checks an exception for given keywords and raises an error if found.                                                                                                                                                               
198                                                                                                                                                                                                                                           
199     It raises a new ``ActionError`` with the desired message if the                                                                                                                                                                       
200     keywords are found. This allows selective                                                                                                                                                                                             
201     control over API error messages.                                                                                                                                                                                                      
202     """                                                                                                                                                                                                                                   
203     exc_type, exc_value, exc_traceback = sys.exc_info()                                                                                                                                                                                   
204     if set(str(exc_value).split(" ")).issuperset(set(keywords)):                                                                                                                                                                          
205         exc_value.message = message                                                                                                                                                                                                       
206         # NOTE: This function is intended to call inside an except clause.                                                                                                                                                                
207         # pylint: disable=misplaced-bare-raise                                                                                                                                                                                            
208         raise                                                                                                                                                                                                                             
209                         

The idea would be to deprecate check_message and use exceptions.handle instead.