Adds user agent string to grpc headers

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#2976](https://github.com/open-telemetry/opentelemetry-python/pull/2976))
 - [exporter/opentelemetry-exporter-otlp-proto-http] Add OTLPMetricExporter
   ([#2891](https://github.com/open-telemetry/opentelemetry-python/pull/2891))
+- `exporter-otlp-proto-grpc`: add user agent string
 
 ## [1.13.0-0.34b0](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.13.0) - 2022-09-26
 

exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/__init__.py

@@ -69,3 +69,6 @@
 API
 ---
 """
+from .version import __version__
+
+_OTLP_GRPC_HEADERS = (('User-Agent', 'OTel OTLP Exporter Python/' + __version__))

exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py

@@ -54,6 +54,9 @@
 from opentelemetry.sdk.resources import Resource as SDKResource
 from opentelemetry.util.re import parse_headers
 from opentelemetry.sdk.metrics.export import MetricsData
+from opentelemetry.exporter.otlp.proto.grpc import (
+    _OTLP_GRPC_HEADERS,
+)
 
 logger = getLogger(__name__)
 SDKDataT = TypeVar("SDKDataT")
@@ -239,6 +242,7 @@ def __init__(
         elif isinstance(self._headers, dict):
             self._headers = tuple(self._headers.items())
 
+        self._headers = self._headers + _OTLP_GRPC_HEADERS
         self._timeout = timeout or int(
             environ.get(OTEL_EXPORTER_OTLP_TIMEOUT, 10)
         )