We have some super great json/structured logging that we're super pleased with, & have been trying to adopt hosted logging services (like SumoLogic) to complement out inhouse ones. We've found that format json doesn't give us any kind of structured logs when we get into sumo logic.
Not sure what to expect from this format in this plugin, and not sure what to expect from SumoLogic interface. We're very happy using Fluentd for log forwarding, and hope there's some way to get our structured logs into SumoLogic.