Add support to type bytes for OTLP AnyValue encoding (#4128)

CHANGELOG.md

@@ -27,6 +27,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4103](https://github.com/open-telemetry/opentelemetry-python/pull/4103))
 - Update semantic conventions to version 1.27.0
   ([#4104](https://github.com/open-telemetry/opentelemetry-python/pull/4104))
+- Add support to type bytes for OTLP AnyValue
+  ([#4128](https://github.com/open-telemetry/opentelemetry-python/pull/4128))
 - Export ExponentialHistogram and ExponentialHistogramDataPoint
   ([#4134](https://github.com/open-telemetry/opentelemetry-python/pull/4134))
 - Implement Client Key and Certificate File Support for All OTLP Exporters

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

@@ -75,6 +75,8 @@ def _encode_value(value: Any) -> PB2AnyValue:
         return PB2AnyValue(int_value=value)
     if isinstance(value, float):
         return PB2AnyValue(double_value=value)
+    if isinstance(value, bytes):
+        return PB2AnyValue(bytes_value=value)
     if isinstance(value, Sequence):
         return PB2AnyValue(
             array_value=PB2ArrayValue(values=[_encode_value(v) for v in value])

exporter/opentelemetry-exporter-otlp-proto-common/tests/test_attribute_encoder.py

@@ -36,6 +36,7 @@ def test_encode_attributes_all_kinds(self):
                 "greet": ["hola", "bonjour"],  # Sequence[str]
                 "data": [1, 2],  # Sequence[int]
                 "data_granular": [1.4, 2.4],  # Sequence[float]
+                "binary_data": b"x00\x01\x02",  # bytes
             }
         )
         self.assertEqual(
@@ -80,6 +81,10 @@ def test_encode_attributes_all_kinds(self):
                         )
                     ),
                 ),
+                PB2KeyValue(
+                    key="binary_data",
+                    value=PB2AnyValue(bytes_value=b"x00\x01\x02"),
+                ),
             ],
         )