fix(gevent): ensure gevent is patched automatically (#3202)

`gevent` was in `_PATCH_ON_IMPORT` but not `PATCH_MODULES` so was not getting picked up for patching.

ddtrace/_monkey.py

@@ -32,6 +32,7 @@
  "elasticsearch": True,
  "algoliasearch": True,
  "futures": True,
+ "gevent": True,
  "grpc": True,
  "httpx": True,
  "mongoengine": True,

releasenotes/notes/fix-gevent-autopatching-7d77beebd4698da2.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+ - |
+ Ensure ``gevent`` is automatically patched.

tests/contrib/gevent/test_monkeypatch.py

@@ -18,3 +18,34 @@ def test_gevent_warning(monkeypatch):
  assert subp.wait() == 0
  assert subp.stdout.read() == b""
  assert b"RuntimeWarning: Loading ddtrace before using gevent monkey patching" in subp.stderr.read()
+
+
+def test_gevent_auto_patching(run_python_code_in_subprocess):
+ code = """
+import ddtrace; ddtrace.patch_all()
+
+import gevent # Patch on import
+from ddtrace.contrib.gevent import GeventContextProvider
+
+
+assert isinstance(ddtrace.tracer.context_provider, GeventContextProvider)
+"""
+
+ out, err, status, pid = run_python_code_in_subprocess(code)
+ assert status == 0, err
+ assert out == b""
+
+
+def test_gevent_ddtrace_run_auto_patching(ddtrace_run_python_code_in_subprocess):
+ code = """
+import gevent # Patch on import
+import ddtrace # ddtrace-run, No need to call patch_all()
+from ddtrace.contrib.gevent import GeventContextProvider
+
+
+assert isinstance(ddtrace.tracer.context_provider, GeventContextProvider)
+"""
+
+ out, err, status, pid = ddtrace_run_python_code_in_subprocess(code)
+ assert status == 0, err
+ assert out == b""