anchor.diff:  [source,java]
   ----
   Hooks.onOperator(providedHook -> providedHook.ifName("single") <1>
  -                                             .operatorStackTrace());
  +                                             .operatorStacktrace());
   ----
   <1> Only activate for operator classes named "single", ignoring case and the
   "Parallel", "Flux" or "Mono" prefixes, as well as "Fuseable" suffix (as seen in
  
positive.code: (or at least before the incriminated flux or mono can be instantiated), like so:
  [source,java]
  ----
  Hooks.onOperator(providedHook -> providedHook.operatorStackTrace());
  ----
  
  The idea is that this will start instrumenting the calls to `Flux` (and
  
negative.code: that new information.
  
  == Reading a stack trace in debug mode
  Reusing our initial example but activating the `operatorStacktrace` debug
  feature, here is the stack we now get:
  
  [source]
  