A very slim and naive built-in reporter, that just stores Tower events as process state.

It keeps only the last 50 events.

Possibly useful for development or testing.

Example

iex> Tower.EphemeralReporter.events()
[]
iex> Application.put_env(:tower, :reporters, [Tower.EphemeralReporter])
iex> spawn(fn -> 1 / 0 end)
iex> Process.sleep(200)
:ok
iex> [event] = Tower.EphemeralReporter.events()
iex> event.kind
:error
iex> event.reason
%ArithmeticError{message: "bad argument in arithmetic expression"}
iex> Tower.EphemeralReporter.reset()