I would like to call of of our servers each time a new Blocker ticket is created (for example) so as to alert us. I know some tools such as HipChat use similar hooks and Bitbucket has a very similar system for Git hooks.
The alertnative would be to constantly poll for new tickets through the API and a JQL query but that's quite innefective.
This is on OnDemand, not a downloadble install.