Some formats (http) allow for a single key to return multiple values. This is used in w3c trace-context which we plan to support:
Tracestate MAY be sent or received as multiple header fields. ... The tracestate header SHOULD be sent as a single field when possible, but MAY be split into multiple header fields.
We don't currently specify this requirement in our spec:
https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/api-propagators.md#getter-argument
As a consequence, we aren't handling that well in java, and likely other languages:
https://github.com/open-telemetry/opentelemetry-java/blob/v0.2.x/api/src/main/java/io/opentelemetry/context/propagation/HttpTextFormat.java#L123
How do we want to handle this? Should we push responsibility for joining them properly to the Getter, or should the API support returning multiple values?
Some formats (http) allow for a single key to return multiple values. This is used in w3c trace-context which we plan to support:
We don't currently specify this requirement in our spec:
https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/api-propagators.md#getter-argument
As a consequence, we aren't handling that well in java, and likely other languages:
https://github.com/open-telemetry/opentelemetry-java/blob/v0.2.x/api/src/main/java/io/opentelemetry/context/propagation/HttpTextFormat.java#L123
How do we want to handle this? Should we push responsibility for joining them properly to the
Getter, or should the API support returning multiple values?