Erlang, Elixir, Chaos Engineering, Testing, Benchmark.
trace macros: -include_lib("snabbkaffe/include/trace.hrl"). ... handle_state_trans(OldState, State, Data) -> ?tp(info, state_change, #{ from => OldState , to => State }), keep_state_and_data. handle_state_trans(OldState, State, Data) -> ?tp(info, state_change, #{ from => OldState , to => State }),