_encode_events assumes that event.attributes.dropped exists

[alexmojaki]

This line:

opentelemetry-python/exporter/opentelemetry-exporter-otlp-proto-common/src/opentelemetry/exporter/otlp/proto/common/_internal/trace_encoder/__init__.py

Line 139 in 8ad10f7

dropped_attributes_count=event.attributes.dropped,

is essentially assuming that event.attributes is a BoundedAttributes, but its type is declared as types.Attributes, i.e. Optional[Mapping[str, AttributeValue]]. This means that event.attributes could easily be another mapping such as dict or even None in which case trying to access .dropped raises AttributeError.

Just above in the same file is an example of one good way to solve this:

opentelemetry-python/exporter/opentelemetry-exporter-otlp-proto-common/src/opentelemetry/exporter/otlp/proto/common/_internal/trace_encoder/__init__.py

Line 122 in 8ad10f7

dropped_attributes_count=sdk_span.dropped_attributes,

i.e. a property Event.dropped_attributes identical to ReadableSpan.dropped_attributes could be created.

For context, I encountered this problem while creating modified copies of Event objects in which sensitive data is removed in a custom SpanProcessor.

[soumyadeepm04]

Hello, if no one is working on this, could I have a go at it?

[pmcollins]

Please feel free @soumyadeepm04 if you are still interested.