iexで:observer.startと打てばobserverを開くことができる。
% iex
Erlang/OTP 23 [erts-11.0] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe]
Interactive Elixir (1.7.4) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :observer.start
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