TracesData represents the traces data that can be stored in a persistent storage,
OR can be embedded by other protocols that transfer OTLP traces data but do
not implement the OTLP protocol.
SpanFlags represents constants used to interpret the
Span.flags field, which is protobuf ‘fixed32’ type and is to
be used as bit-fields. Each non-zero value defined in this enum is
a bit-mask. To extract the bit-field, for example, use an
expression like: