Add warning when no opentelemetry_configurator entry points found

Author: Manvi2402

opentelemetry-instrumentation/src/opentelemetry/instrumentation/auto_instrumentation/_load.py

@@ -61,6 +61,14 @@ def _key_for(entry_point: EntryPoint):
 
 def _load_distro() -> BaseDistro:
     distro_name = environ.get(OTEL_PYTHON_DISTRO, None)
+    all_distros = list(entry_points(group="opentelemetry_distro"))
+    if not all_distros:
+        _logger.warning(
+            "No distro found. Make sure 'opentelemetry-distro' is installed "
+            "if you are using automatic instrumentation. "
+            "See https://opentelemetry.io/docs/zero-code/python/ for details."
+        )
+
     for entry_point in entry_points(group="opentelemetry_distro"):
         try:
             # If no distro is specified, use first to come up.
@@ -160,6 +168,15 @@ def _load_instrumentors(distro):
 def _load_configurators():
     configurator_name = environ.get(OTEL_PYTHON_CONFIGURATOR, None)
     configured = None
+    all_configurators = list(entry_points(group="opentelemetry_configurator"))
+    if not all_configurators:
+        _logger.warning(
+            "No configurator found. Make sure 'opentelemetry-distro' is "
+            "installed if you are using automatic instrumentation. "
+            "See https://opentelemetry.io/docs/zero-code/python/ for details."
+        )
+        return
+
     for entry_point in entry_points(group="opentelemetry_configurator"):
         if configured is not None:
             _logger.warning(

opentelemetry-instrumentation/tests/auto_instrumentation/test_load.py

@@ -67,6 +67,14 @@ def test_load_configurators(self, iter_mock):  # pylint: disable=no-self-use
     )
     def test_load_configurators_no_ep(self, iter_mock):  # pylint: disable=no-self-use
         iter_mock.return_value = ()
+        with self.assertLogs(
+            "opentelemetry.instrumentation.auto_instrumentation._load",
+            level="WARNING",
+        ) as cm:
+            _load._load_configurators()
+        self.assertTrue(
+            any("opentelemetry-distro" in msg for msg in cm.output)
+        )
         # Confirm method does not crash if not entry points exist.
         _load._load_configurators()