[ConfluentKafkaInstrumentor] Not all methods are supported by returned proxy objects

Describe your environment

• Python: 3.9.25
• OS: macOS Darwin 25.3.0 (also reproducible on Linux)
• confluent-kafka: 2.6.1
• opentelemetry-instrumentation-confluent-kafka: 0.60b1
• opentelemetry-api: 1.29.0
• opentelemetry-sdk: 1.29.0

What happened?

Calling list_topics() or assignment() on a ProxiedProducer or ProxiedConsumer returned by ConfluentKafkaInstrumentor().instrument_producer() / instrument_consumer() causes a segmentation fault or error RuntimeError: Consumer closed.

Reproducer:

from confluent_kafka import Producer
from opentelemetry.instrumentation.confluent_kafka import ConfluentKafkaInstrumentor

# Create and instrument producer
p = Producer({'bootstrap.servers': 'localhost:9092'})
p_instrumented = ConfluentKafkaInstrumentor().instrument_producer(p)

# This causes a segfault
topics = p_instrumented.list_topics(timeout=5)

Note:
There may be more methods missing in the proxy object. And I propose that the Proxy class should proxy all method calls on the actual confluent Kafka client when not defined in the proxy class.

Steps to Reproduce

Start kafka using docker and run following code:

from confluent_kafka import Producer
from opentelemetry.instrumentation.confluent_kafka import ConfluentKafkaInstrumentor

# Create and instrument producer
p = Producer({'bootstrap.servers': 'localhost:9092'})
p_instrumented = ConfluentKafkaInstrumentor().instrument_producer(p)

# This causes a segfault
topics = p_instrumented.list_topics(timeout=5)

Expected Result

The app does not crash.

Actual Result

segmentation fault or error RuntimeError: Consumer closed when calling list_topics()

Additional context

No response

Would you like to implement a fix?

None

Tip

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Start with the ProxiedProducer and ProxiedConsumer implementations used by instrument_producer() and instrument_consumer(), then reproduce the failure with list_topics() and assignment() using the provided examples. Done means these calls no longer segfault or raise the reported closed-consumer error, with the supported proxy behavior verified against the actual Confluent Kafka clients.