Illegal access to span.kind

Describe your environment

No response

What happened?

Several instrumentation modules seem to access a kind property of Span objects, even though no such property exists in the Span ABC. The implementations seem to assume that opentelemetry-sdk is active, which uses its own Span class deriving from ReadableSpan, which in turn provides a kind property.

Here is an overview of modules making that erroneous assumption:

$ ag '\.kind\b' $(ag -l '\.kind\b' instrumentation/opentelemetry-instrumentation-* | grep -v '/tests/')
instrumentation/opentelemetry-instrumentation-asgi/src/opentelemetry/instrumentation/asgi/__init__.py
714:                    if current_span.kind == trace.SpanKind.SERVER:
870:            and server_span.kind == trace.SpanKind.SERVER

instrumentation/opentelemetry-instrumentation-django/src/opentelemetry/instrumentation/django/middleware/otel_middleware.py
259:                if span.is_recording() and span.kind == SpanKind.SERVER:
275:                if span.is_recording() and span.kind == SpanKind.SERVER:
369:                if span.is_recording() and span.kind == SpanKind.SERVER:
396:                if span.is_recording() and span.kind == SpanKind.SERVER:

instrumentation/opentelemetry-instrumentation-falcon/src/opentelemetry/instrumentation/falcon/__init__.py
356:            if span.is_recording() and span.kind == trace.SpanKind.SERVER:
488:            if span.is_recording() and span.kind == trace.SpanKind.SERVER:

instrumentation/opentelemetry-instrumentation-flask/src/opentelemetry/instrumentation/flask/__init__.py
374:                        and span.kind == trace.SpanKind.SERVER
461:            if span.is_recording() and span.kind == trace.SpanKind.SERVER:

instrumentation/opentelemetry-instrumentation-pyramid/src/opentelemetry/instrumentation/pyramid/callbacks.py
115:        if span.kind == trace.SpanKind.SERVER:
236:                if span.is_recording() and span.kind == trace.SpanKind.SERVER:

instrumentation/opentelemetry-instrumentation-tornado/src/opentelemetry/instrumentation/tornado/__init__.py
504:        if span.is_recording() and span.kind == trace.SpanKind.SERVER:
564:        if ctx.span.is_recording() and ctx.span.kind == trace.SpanKind.SERVER:

instrumentation/opentelemetry-instrumentation-wsgi/src/opentelemetry/instrumentation/wsgi/__init__.py
611:            if span.is_recording() and span.kind == trace.SpanKind.SERVER:
647:        if span.is_recording() and span.kind == trace.SpanKind.SERVER:

Steps to Reproduce

Expected Result

Actual Result

Additional context

No response

Would you like to implement a fix?

None

Start with the Span ABC in opentelemetry-api/src/opentelemetry/trace/span.py and compare it with the SDK Span and ReadableSpan definitions referenced in the issue. Review each listed instrumentation file for accesses to span.kind, then verify that all affected modules work against the API Span interface rather than assuming the SDK implementation.