emqx4.3/lib-extra/plugins

{erlang_plugins,
  [ {emqx_plugin_template, {git, "https://github.com/emqx/emqx-plugin-template", {tag, "4.3.0"}}}
  ]
}.

{elixir_plugins,
  [ {emqx_elixir_plugin, {git, "https://github.com/zmstone/emqx-elixir-plugin.git", {branch, "umbrella"}}}
  ]
}.