Rule Request: AvoidReactorOnEachOperator

[jborgers]

Using Reactor Hooks.onEachOperator means executing the code on every operator in the Reactor flow, for every element. This typically means much processing time.
The recommendation is to just do processing when actually needed.

example:

@Configuration
public class MdcContextLifterConfiguration {
    private String MDC_CONTEXT_REACTOR_KEY = MdcContextLifterConfiguration.class.getName();
    @PostConstruct
    private void contextOperatorHook() {
        Hooks.onEachOperator(MDC_CONTEXT_REACTOR_KEY,
                Operators.lift((scannable, coreSubscriber) -> new MdcContextLifter<>(coreSubscriber))
        );
    }
    @PreDestroy
    private void cleanupHook() {
        Hooks.resetOnEachOperator(MDC_CONTEXT_REACTOR_KEY);
    }
}