Replace patch_all with modern config option ddtrace.auto (DataDog#20651)

* replace patch_all

* changelog

* relax test memory limit

* Update test_db_statements.py

Author: steveny91

datadog_checks_base/changelog.d/20651.fixed

@@ -0,0 +1 @@
+Replace patch_all with modern config ddtrace.auto

datadog_checks_base/datadog_checks/base/utils/tracing.py

@@ -123,9 +123,9 @@ def traced_class(cls):
         try:
             integration_tracing_exhaustive = is_affirmative(datadog_agent.get_config('integration_tracing_exhaustive'))
 
-            from ddtrace import patch_all, tracer
-
-            patch_all()
+            # https://ddtrace.readthedocs.io/en/stable/basic_usage.html#ddtrace-auto
+            import ddtrace.auto  # noqa: F401
+            from ddtrace import tracer
 
             def decorate(cls):
                 for attr in cls.__dict__:

datadog_checks_base/tests/base/utils/db/test_db_statements.py

@@ -278,7 +278,7 @@ def test_compute_derivative_rows_mem_usage(self):
         This test is skipped if tracemalloc is not available
         '''
         # The memory usage threshold takes tracing overhead into account
-        MEMORY_USAGE_THRESHOLD = 8 * 1024 * 1024  # 8 MB
+        MEMORY_USAGE_THRESHOLD = 10 * 1024 * 1024  # 10 MB
 
         try:
             import tracemalloc