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The default Open Telemetry SDK (hereafter referred to as "The SDK") is highly configurable. This specification outlines the mechanisms by which the SDK can be configured. It does not attempt to specify the details of what can be configured.
The SDK MUST provide a programmatic interface for all configuration. This interface SHOULD be written in the language of the SDK itself. All other configuration mechanisms SHOULD be built on top of this interface.
An example of this programmatic interface is accepting a well-defined struct on an SDK builder class. From that, one could build a CLI that accepts a file (YAML, JSON, TOML, ...) and then transforms into that well-defined struct consumable by the programmatic interface.
See OpenTelemetry Environment Variable Specification.
See File Configuration.
Additional configuration mechanisms SHOULD be provided in whatever language/format/style is idiomatic for the language of the SDK. The SDK can include as many configuration mechanisms as appropriate.