reactor-core/src/main/java/reactor/core/publisher/Flux.java
public final Flux<T> tag(String key, String value) {
		return FluxName.createOrAppend(this, key, value);
	}
public final Flux<T> tag(String key, String value) {
		return FluxName.createOrAppend(this, key, value);
	}
public final Flux < T > tag ( String key , String value ) { return FluxName . createOrAppend ( this , key , value ) ; }
Tag this flux with a key/value pair. These can be retrieved as a {@link Set} of
all tags throughout the publisher chain by using {@link Scannable#tags()} (as
traversed
by {@link Scannable#parents()}).

@param key a tag key
@param value a tag value
@return the same sequence, but bearing tags
Tag this flux with a key / value pair . These can be retrieved as a { @link Set } of all tags throughout the publisher chain by using { @link Scannable#tags () } ( as traversed by { @link Scannable#parents () } ) .