Astarte.DataAccess.Config.astarte_instance_id-exclamation-mark

You're seeing just the function astarte_instance_id-exclamation-mark, go back to Astarte.DataAccess.Config module for more information.
Link to this function

astarte_instance_id!(namespace \\ nil)

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Specs

astarte_instance_id!(Skogsra.Env.namespace()) :: binary() | no_return()

A string that uniquely identifies this Astarte instance. It will be used to generate Scylla keyspaces starting from Astarte realm names. Defaults to "".

Bang version of Astarte.DataAccess.Config.astarte_instance_id/0 (fails on error). Optionally, receives the namespace for the variable.