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GH-3298-conf-by-env-vars.md

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  • Configuration values can now be set using OS environment variables, where the environment variable name is on the form AE__k1__k2, e.g. AE__CHAIN__PERSIST=true. Note that two underscores are used to separate each level. Structured values must be JSON-encoded. The prefix AE can not be customized. The environment variables are applied after reading an available config file, and all values are checked against the schema. See docs/configuration.md.