[rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage

[jschmied]

You can call fireAllRules after every event changing the state of the facts
or of the ruleflow. When you do event stream processing and use the time
inside your rules, the time is a change event too. So you have to use
fireUntilHalt if you can't afford to have the small pauses using
fireAllRules/Sleep in a loop.

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