Report app dependency addition/removal to DataDog

corehq/apps/app_manager/models.py

@@ -181,6 +181,7 @@
 from corehq.blobs.mixin import CODES, BlobMixin
 from corehq.const import USER_DATE_FORMAT, USER_TIME_FORMAT
 from corehq.util import bitly, view_utils
+from corehq.util.metrics import metrics_counter
 from corehq.util.quickcache import quickcache
 from corehq.util.timer import TimingContext, time_method
 from corehq.util.timezones.conversions import ServerTime
@@ -4467,8 +4468,31 @@ def make_build(self, comment=None, user_id=None):
         assert copy._id
         prune_auto_generated_builds.delay(self.domain, self._id)
 
+        self.check_build_dependencies(new_build=copy)
+
         return copy
 
+    def check_build_dependencies(self, new_build):
+        """
+        Reports whether the app dependencies have been added or removed.
+        """
+
+        def has_dependencies(build):
+            return bool(
+                build.profile.get('features', {}).get('dependencies')
+            )
+
+        new_build_has_dependencies = has_dependencies(new_build)
+
+        last_build = get_latest_build_doc(self.domain, self.id)
+        last_build = self.__class__.wrap(last_build) if last_build else None
+        last_build_has_dependencies = has_dependencies(last_build) if last_build else False
+
+        if not last_build_has_dependencies and new_build_has_dependencies:
+            metrics_counter('commcare.app_build.dependencies_added')
+        elif last_build_has_dependencies and not new_build_has_dependencies:
+            metrics_counter('commcare.app_build.dependencies_removed')
+
     def convert_app_to_build(self, copy_of, user_id, comment=None):
         self.copy_of = copy_of
         built_on = datetime.datetime.utcnow()

corehq/apps/app_manager/tests/test_apps.py

@@ -414,3 +414,48 @@ def test_get_latest_enabled_build_with_loc_flag(self):
             location_flag_enabled=True,
         )
         self.assertIsNone(build)
+
+    def test_dependencies_feature_added(self):
+        factory = AppFactory(build_version='2.40.0')
+        m0, f0 = factory.new_basic_module('register', 'case')
+        f0.source = get_simple_form(xmlns=f0.unique_id)
+        factory.app.profile = {'features': {'dependencies': ['coffee']}}
+        factory.app.save()
+        self.addCleanup(factory.app.delete)
+
+        with patch("corehq.apps.app_manager.models.metrics_counter") as metric_counter_mock:
+            factory.app.make_build()
+            metric_counter_mock.assert_called_with('commcare.app_build.dependencies_added')
+
+    def test_dependencies_feature_removed(self):
+        factory = AppFactory(build_version='2.40.0')
+        m0, f0 = factory.new_basic_module('register', 'case')
+        f0.source = get_simple_form(xmlns=f0.unique_id)
+        factory.app.profile = {'features': {'dependencies': ['coffee']}}
+        factory.app.save()
+        self.addCleanup(factory.app.delete)
+        build1 = factory.app.make_build()
+        build1.save()
+
+        factory.app.profile = {'features': {'dependencies': []}}
+        factory.app.save()
+
+        with patch("corehq.apps.app_manager.models.metrics_counter") as metric_counter_mock:
+            factory.app.make_build()
+            metric_counter_mock.assert_called_with('commcare.app_build.dependencies_removed')
+
+    def test_dependencies_feature_metrics_not_triggerd(self):
+        factory = AppFactory(build_version='2.40.0')
+        m0, f0 = factory.new_basic_module('register', 'case')
+        f0.source = get_simple_form(xmlns=f0.unique_id)
+        factory.app.profile = {'features': {'dependencies': []}}
+        factory.app.save()
+        self.addCleanup(factory.app.delete)
+        build1 = factory.app.make_build()
+        build1.save()
+
+        factory.app.save()
+
+        with patch("corehq.apps.app_manager.models.metrics_counter") as metric_counter_mock:
+            factory.app.make_build()
+            metric_counter_mock.assert_not_called()