Listener for complex priority https://atlasteam.ru/?p=1815

MyGroovy - listener - complex priority.groovy

import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.event.type.EventDispatchOption

def issue = event.issue
def cfСomplexPriority = ComponentAccessor.customFieldManager.getCustomFieldObject(10001)//todo set MyGroovy calculate field id

switch (issue.getCustomFieldValue(cfСomplexPriority)) {
    case [0d, 1d, 3d]:
        issue.setPriorityId("5")
        break
    case [9d, 18d, 27d, 36d, 54d, 81d]:
        issue.setPriorityId("4")
        break
    case [108d, 162d, 243d, 324d, 486d]:
        issue.setPriorityId("3")
        break
    case [729d, 972d, 1458d, 2187d, 2916d]:
        issue.setPriorityId("2")
        break
    case [4374d, 6561d, 8748d, 13122d]:
        issue.setPriorityId("1")
        break
}

update(issue)

def update(issue){
    ComponentAccessor.issueManager.updateIssue(
        ComponentAccessor.jiraAuthenticationContext.loggedInUser,
        issue,
        EventDispatchOption.ISSUE_UPDATED,
        false
    );
}