When editing the post-function for a JIRA transition that notifies hipchat,
The default (blank) field gives a message with content eg:
HC-123: A test issue Status A→Transition→Status B by Joe Smith. Current assignee is John Citizen.
I can see there are buttons to help write the replacement items:
$issue, $issueKey, $issueSummary, $issueType, $assignee, $user
How can the message sent to hipchat be customised further?
eg: what other fields are available? what's the current syntax used in case of blank?