Project: mesos
Issue MESOS-2622: Document the semantic change in decorator return values
In order to enable decorator modules to _remove_ metadata (environment variables or labels), we changed the meaning of the return value for decorator hooks. The Result return values means: ||State||Before||After|| |Error|Error is propagated to the call-site|No change| |None|The result of the decorator is not applied|No change| |Some|The result of the decorator is *appended*|The result of the decorator *overwrites* the final labels/environment object|
Story points: 1