Metric Collection Interval when using Templates

Greetings,

I'd like to be alerted for Tablespace Full - Tablespace Space Used (%) metric more often than every 30 minutes which I believe is the default.  I currently have a PDB that I'm testing against, where I fill up a monitored tablespace to the critical threshold.  I have this PDB assigned to a group and then a monitoring template created for this group.  When I adjust the Collection schedule within the monitoring template, for example to every 5 minutes, and then apply it to the Group target, the schedule doesn't change.  The alert still only arrives every 30 minutes.  I