fix: add schematize service name for django caching

ddtrace/contrib/internal/django/patch.py

@@ -215,7 +215,7 @@ def traced_cache(django, pin, func, instance, args, kwargs):
         "django.cache",
         span_name="django.cache",
         span_type=SpanTypes.CACHE,
-        service=config.django.cache_service_name,
+        service=schematize_service_name(config.django.cache_service_name),
         resource=utils.resource_from_cache_prefix(func_name(func), instance),
         tags=tags,
         pin=pin,

releasenotes/notes/django-cache-service-name-schematization-bef19b44b7414016.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    tracing(django): Fixes issue where django cache is represented as a django service rather than the third party service.

tests/contrib/django/test_django.py

@@ -30,6 +30,7 @@
 from ddtrace.ext import http
 from ddtrace.ext import user
 from ddtrace.internal.compat import ensure_text
+from ddtrace.internal.schema import schematize_service_name
 from ddtrace.propagation._utils import get_wsgi_header
 from ddtrace.propagation.http import HTTP_HEADER_PARENT_ID
 from ddtrace.propagation.http import HTTP_HEADER_SAMPLING_PRIORITY
@@ -769,6 +770,18 @@ def test_cache_get(test_spans):
     assert_dict_issuperset(span.get_tags(), expected_meta)
 
 
+def test_cache_service_schematization(test_spans):
+    cache = django.core.cache.caches["default"]
+
+    with override_config("django", dict(cache_service_name="test-cache-service")):
+        cache.get("missing_key")
+        spans = test_spans.get_spans()
+        assert spans
+        span = spans[0]
+        expected_service_name = schematize_service_name(config.django.cache_service_name)
+        assert span.service == expected_service_name
+
+
 def test_cache_get_rowcount_existing_key(test_spans):
     # get the default cache
     cache = django.core.cache.caches["default"]