chore(writer): add missing metadata to native writer (#14623)

Fix missing metadata in native writer telemetry.
The trace exporter needs the tracer to set service and env name to
include it in telemetry payloads.
## Checklist
- [x] PR author has checked that all the criteria below are met
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- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
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[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

Author: VianneyRuhlmann

ddtrace/internal/native/_native.pyi

@@ -232,6 +232,12 @@ class TraceExporterBuilder:
         :param version: The version string of the application.
         """
         ...
+    def set_service(self, service: str) -> TraceExporterBuilder:
+        """
+        Set the service name of the TraceExporter.
+        :param version: The version string of the application.
+        """
+        ...
     def set_git_commit_sha(self, git_commit_sha: str) -> TraceExporterBuilder:
         """
         Set the git commit sha of the TraceExporter.

ddtrace/internal/writer/writer.py

@@ -15,6 +15,7 @@
 
 import ddtrace
 from ddtrace import config
+from ddtrace.internal.hostname import get_hostname
 import ddtrace.internal.native as native
 from ddtrace.internal.runtime import get_runtime_id
 import ddtrace.internal.utils.http
@@ -796,6 +797,7 @@ def _create_exporter(self) -> native.TraceExporter:
         builder = (
             native.TraceExporterBuilder()
             .set_url(self.intake_url)
+            .set_hostname(get_hostname())
             .set_language("python")
             .set_language_version(compat.PYTHON_VERSION)
             .set_language_interpreter(compat.PYTHON_INTERPRETER)
@@ -805,6 +807,12 @@ def _create_exporter(self) -> native.TraceExporter:
             .set_input_format(self._api_version)
             .set_output_format(self._api_version)
         )
+        if config.service:
+            builder.set_service(config.service)
+        if config.env:
+            builder.set_env(config.env)
+        if config.version:
+            builder.set_app_version(config.version)
         if self._test_session_token is not None:
             builder.set_test_session_token(self._test_session_token)
         if self._stats_opt_out:

tests/tracer/test_writer.py

@@ -1171,6 +1171,7 @@ def test_writer_telemetry_enabled_on_linux(
 
     for method_name in [
         "set_url",
+        "set_hostname",
         "set_language",
         "set_language_version",
         "set_language_interpreter",