MAX 15 minutes: {{HOSTNAME}:

{TRIGGER.KEY}.max(900)}
MIN 15 minutes: {{HOSTNAME}:{TRIGGER.KEY}

.min(900)}

The trigger.key was between -1.5 and -3.8. The result is:

MAX 15 minutes: 16777216 TCelius
MIN 15 minutes: 16777216 TCelius

The trigger.key was between 2 and -1. The result is: