How does your payload look like? It seems like console logger ignores complex data structures.
config :logger,
default_formatter: [
format: "$metadata[$level] $message\n",
metadata: [:request_id, :primitive, :complex]
]
iex> require Logger
Logger
iex> Logger.error("message", primitive: :foo, complex: %{foo: :bar})
primitive=foo [error] message
iex> Logger.error("message", primitive: :foo, complex: :bar)
primitive=foo complex=bar [error] message
iex> Logger.error("message", primitive: :foo, complex: Jason.encode!(%{foo: :bar}))
primitive=foo complex={"foo":"bar"} [error] message
) then you should either JSON encode it, or just 
I believe there’s a niche to be served in the Elixir ecosystem by custom 