question: public static void registerGlobalSpanTagHandler ( SpanTagHandler handler ) { HANDLERS . add ( handler ) ; HANDLERS_BY_CHARACTER_STYLE . put ( handler . getSupportedCharacterStyle ( ) , handler ) ; }
target:  Registers a process-scope SpanTagHandler. This will *not properly override any existing SpanTagHandler for the same span/tag combination; use SpanTagRoster for those. But, if you have *additional* spans and tags to handle, and you want to do so globally, register them here.