feat(ddtrace-api): patch tracer.set_tags in the ddtrace-api integration (#13824)

This change adds patching to `Tracer.set_tags` in the ddtrace-api
integration to support a common use case in Rapid

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- 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
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

Author: emmettbutler

ddtrace/contrib/internal/ddtrace_api/patch.py

@@ -95,6 +95,7 @@ def patch(tracer=None):
 
     DDTraceAPIWrappingContextBase(ddtrace_api.Tracer.start_span).wrap()
     DDTraceAPIWrappingContextBase(ddtrace_api.Tracer.trace).wrap()
+    DDTraceAPIWrappingContextBase(ddtrace_api.Tracer.set_tags).wrap()
     DDTraceAPIWrappingContextBase(ddtrace_api.Tracer.current_span).wrap()
     DDTraceAPIWrappingContextBase(ddtrace_api.Tracer.current_root_span).wrap()
     DDTraceAPIWrappingContextBase(ddtrace_api.Span.finish).wrap()
@@ -115,6 +116,7 @@ def unpatch():
 
     DDTraceAPIWrappingContextBase.extract(ddtrace_api.Tracer.start_span).unwrap()
     DDTraceAPIWrappingContextBase.extract(ddtrace_api.Tracer.trace).unwrap()
+    DDTraceAPIWrappingContextBase.extract(ddtrace_api.Tracer.set_tags).unwrap()
     DDTraceAPIWrappingContextBase.extract(ddtrace_api.Tracer.current_span).unwrap()
     DDTraceAPIWrappingContextBase.extract(ddtrace_api.Tracer.current_root_span).unwrap()
     DDTraceAPIWrappingContextBase.extract(ddtrace_api.Span.finish).unwrap()

releasenotes/notes/tracer-set-tags-ade1e93c9f40090a.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    ddtrace-api: Adds patching of ``ddtrace_api.tracer.set_tags`` to the ``ddtrace_api`` integration

tests/contrib/ddtrace_api/test_integration.py

@@ -128,3 +128,11 @@ def test_set_tags(self):
         spans = self._assert_real_spans()
         assert spans[0]._meta["tag1"] == "value1", "Tag set via API should be applied to the real spans"
         assert spans[0]._meta["tag2"] == "value2", "Tag set via API should be applied to the real spans"
+
+    @pytest.mark.snapshot()
+    def test_tracer_set_tags(self):
+        ddtrace_api.tracer.set_tags({"tag1": "value1", "tag2": "value2"})
+        ddtrace_api.tracer.trace("web.request").finish()
+        spans = self._assert_real_spans()
+        assert spans[0]._meta["tag1"] == "value1", "Tag set via API should be applied to the real spans"
+        assert spans[0]._meta["tag2"] == "value2", "Tag set via API should be applied to the real spans"

tests/snapshots/tests.contrib.ddtrace_api.test_integration.DDTraceAPITestCase.test_tracer_set_tags.json

@@ -0,0 +1,27 @@
+[[
+  {
+    "name": "web.request",
+    "service": "tests.contrib.ddtrace_api",
+    "resource": "web.request",
+    "trace_id": 0,
+    "span_id": 1,
+    "parent_id": 0,
+    "type": "",
+    "error": 0,
+    "meta": {
+      "_dd.p.dm": "-0",
+      "_dd.p.tid": "6862c99700000000",
+      "language": "python",
+      "runtime-id": "189ff080b5004f2186829183a50e3c67",
+      "tag1": "value1",
+      "tag2": "value2"
+    },
+    "metrics": {
+      "_dd.top_level": 1,
+      "_dd.tracer_kr": 1.0,
+      "_sampling_priority_v1": 1,
+      "process_id": 1638
+    },
+    "duration": 112708,
+    "start": 1751304599164607503
+  }]]