Astarte.DataAccess.Config.ssl_custom_sni-exclamation-mark

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

ssl_custom_sni!(namespace \\ nil)

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Specs

ssl_custom_sni!(Skogsra.Env.namespace()) :: (nil | binary()) | no_return()

Specify the hostname to be used in TLS Server Name Indication extension. If not specified, the cassandra nodes will be used. This value is used only if Server Name Indication is enabled.

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