conflent-kafka: Proxy producer purge (#2638)

Author: joshschltelus

Diff for: CHANGELOG.md

@@ -20,6 +20,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#2573](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2573))
 - `opentelemetry-instrumentation-confluent-kafka` Add support for version 2.4.0 of confluent_kafka
   ([#2616](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2616))
+- `opentelemetry-instrumentation-confluent-kafka` Add support for produce purge
+  ([#2638](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2638))
 
 ### Breaking changes
 

Diff for: instrumentation/opentelemetry-instrumentation-confluent-kafka/src/opentelemetry/instrumentation/confluent_kafka/__init__.py

@@ -156,6 +156,9 @@ def flush(self, timeout=-1):
     def poll(self, timeout=-1):
         return self._producer.poll(timeout)
 
+    def purge(self, in_queue=True, in_flight=True, blocking=True):
+        self._producer.purge(in_queue, in_flight, blocking)
+
     def produce(
         self, topic, value=None, *args, **kwargs
     ):  # pylint: disable=keyword-arg-before-vararg