public boolean trace(int level, String note) {
        return trace(level, note, true);
    }
Add the given note to the trace information if tracing is enabled for the given level.

@param level The trace level of the note.
@param note  The note to add.
@return True if the note was added to the trace information, false otherwise.
messagebus/src/main/java/com/yahoo/messagebus/Trace.java