Pass excluded_urls to Flask auto-instrumentation

The Flask instrumentation can be applied on two levels:

* The `module` level (auto-instrumentation), which patches the `Flask` class.
* The `app` level, which patches a `Flask` instance.

This commit applies a few missing `excluded_urls` keyword arguments to
ensure the auto-instrumentation provides the same configurability as the
app-level instrumentation.

Author: mattoberle

Diff for: instrumentation/opentelemetry-instrumentation-flask/src/opentelemetry/instrumentation/flask/__init__.py

@@ -205,15 +205,19 @@ def __init__(self, *args, **kwargs):
         self._is_instrumented_by_opentelemetry = True
 
         self.wsgi_app = _rewrapped_app(
-            self.wsgi_app, _InstrumentedFlask._response_hook
+            self.wsgi_app,
+            _InstrumentedFlask._response_hook,
+            excluded_urls=_InstrumentedFlask._excluded_urls,
         )
 
         tracer = trace.get_tracer(
             __name__, __version__, _InstrumentedFlask._tracer_provider
         )
 
         _before_request = _wrapped_before_request(
-            _InstrumentedFlask._request_hook, tracer,
+            _InstrumentedFlask._request_hook,
+            tracer,
+            excluded_urls=_InstrumentedFlask._excluded_urls,
         )
         self._before_request = _before_request
         self.before_request(_before_request)
@@ -273,7 +277,9 @@ def instrument_app(
                 else _excluded_urls_from_env
             )
             app._original_wsgi_app = app.wsgi_app
-            app.wsgi_app = _rewrapped_app(app.wsgi_app, response_hook)
+            app.wsgi_app = _rewrapped_app(
+                app.wsgi_app, response_hook, excluded_urls=excluded_urls
+            )
 
             tracer = trace.get_tracer(__name__, __version__, tracer_provider)
 

Diff for: instrumentation/opentelemetry-instrumentation-flask/tests/test_automatic.py

@@ -59,3 +59,23 @@ def test_uninstrument(self):
         self.assertEqual([b"Hello: 123"], list(resp.response))
         span_list = self.memory_exporter.get_finished_spans()
         self.assertEqual(len(span_list), 1)
+
+    def test_exluded_urls_explicit(self):
+        FlaskInstrumentor().uninstrument()
+        FlaskInstrumentor().instrument(excluded_urls="/hello/456")
+
+        self.app = flask.Flask(__name__)
+        self.app.route("/hello/<int:helloid>")(self._hello_endpoint)
+        client = Client(self.app, BaseResponse)
+
+        resp = client.get("/hello/123")
+        self.assertEqual(200, resp.status_code)
+        self.assertEqual([b"Hello: 123"], list(resp.response))
+        span_list = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(span_list), 1)
+
+        resp = client.get("/hello/456")
+        self.assertEqual(200, resp.status_code)
+        self.assertEqual([b"Hello: 456"], list(resp.response))
+        span_list = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(span_list), 1)