datadog-apm: deprecate datadog exporter (#900)

Author: mabdinur

CHANGELOG.md

@@ -22,6 +22,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `opentelemetry-instrumentation-requests` make span attribute available to samplers
   ([#931](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/931))
 
+- `opentelemetry-datadog-exporter` add deprecation note to example.
+  ([#900](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/900))
+
 ### Fixed
 
 - `opentelemetry-instrumentation-logging` retrieves service name defensively.

exporter/opentelemetry-exporter-datadog/README.rst

@@ -1,5 +1,5 @@
-OpenTelemetry Datadog Exporter
-==============================
+OpenTelemetry Datadog Span Exporter
+===================================
 
 |pypi|
 
@@ -10,6 +10,9 @@ This library allows to export tracing data to `Datadog
 <https://www.datadoghq.com/>`_. OpenTelemetry span event and links are not
 supported.
 
+.. warning:: This exporter has been deprecated. To export your OTLP traces from OpenTelemetry SDK directly to Datadog Agent, please refer to `OTLP Ingest in Datadog Agent <https://docs.datadoghq.com/tracing/setup_overview/open_standards/#otlp-ingest-in-datadog-agent>`_ .
+
+
 Installation
 ------------