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

That’s to be expected. You can add metadata that is associated with the current process, using Logger.metadata/1. Whatever you pass in with Logger.error/2 as a second parameter will add to that metadata. But that “base” metadata can be anything, and by default is probably rightfully so an empty list.

OK I am definitely having a Saturday moment and spoke too soon without scanning properly. The application key got printed, the payload thing didn’t.

Still leaving @LostKobrakai’s comment as the solution since it achieved partial success but the search goes on.