Ability to choose Service Limit Percentage

Hi Guys, 

Situation now

Today it's possible to send notifications when Jira instance is about to breach 'Processing time limits'.

It's to choose:

1- Used more than 80% of service limit.

2- Used more than 90% of service limit

3 - Breached service limit 

Suggested Solution

Create the ability to choose other percentage values like as 60%, 50% or number field to choose the desired percentage