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emqx/changes/ce/feat-13507.en.md

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Added a new builtin function getenv in the rule engine and variform expression to access the environment variables with below limitations.

  • Prefix EMQXVAR_ is added before reading from OS environment variables. i.e. getenv('FOO_BAR') is to read EMQXVAR_FOO_BAR.
  • The values are immutable once loaded from the OS environment.