Long delay in automation rule

Summary

This issue came from PS-10718 where the customer saw a ~ 2 hour delay in automation rules on new issues created. The cause that automation is placed on the scheduler which takes too long to execute it. 

Environment

• ServiceDesk 3.2.5

Steps to Reproduce

1. Create rules.
2. Trigger the rule (for example create an issue) 1x per second from jmeter
3. Make sure rules are processed slower than JIRA events are propagated.
4. See that, the rule has delay, and delay is increasing (the more rules and the slowest the rules are and the more triggers incoming - the longer delay)

Expected Results

ServiceDesk Automation rule should not be using JIRA scheduler that can be stacked with other services.

Actual Results

Servicedesk Automation rule kicks out 1-2h after the issue creation.

Workaround

• remove the slowest rules, or
• slow down mail handler (if it's possible).