We’ve just started using OpenTelemetry — OpenTelemetry API v1.0.0-rc.3.2 to integrate our APM with Datadog. According to the Open Telemetry specification

• The attribute value, which is either:
  • A primitive type: string, boolean, double precision floating point (IEEE 754-1985) or signed 64 bit integer.
  • An array of primitive type values. The array MUST be homogeneous, i.e. it MUST NOT contain values of different types. For protocols that do not natively support array values such values SHOULD be represented as JSON strings. There’s also Span attributes: array of primitives · Issue #111 · open-telemetry/opentelemetry-erlang · GitHub which seems to imply that opentelemetry-erlang supports arrays of primitives in span attributes. However when I try to add span attributes with an array

OpenTelemetry.Span.start_span(span_ctx, [{"key1", ["one", "two"]}])

in the otel collector logs I see that attribute come through as EMPTY. Is it currently possible to use arrays or is there still some work to do?

@tristan I saw you mention that you were scanning for Open Telemetry questions so I hope you don’t mind me tagging you here.