diff --git a/samcli/commands/build/build_context.py b/samcli/commands/build/build_context.py
index 817547402c..59f9e4b25c 100644
--- a/samcli/commands/build/build_context.py
+++ b/samcli/commands/build/build_context.py
@@ -11,6 +11,7 @@
 
 from samcli.commands._utils.experimental import ExperimentalFlag, prompt_experimental
 from samcli.lib.providers.sam_api_provider import SamApiProvider
+from samcli.lib.telemetry.event import EventTracker
 from samcli.lib.utils.packagetype import IMAGE
 
 from samcli.commands._utils.template import get_template_data
@@ -267,6 +268,9 @@ def run(self):
                     modified_template = nested_stack_manager.generate_auto_dependency_layer_stack()
                 move_template(stack.location, output_template_path, modified_template)
 
+            for f in self.get_resources_to_build().functions:
+                EventTracker.track_event("BuildFunctionRuntime", f.runtime)
+
             click.secho("\nBuild Succeeded", fg="green")
 
             # try to use relpath so the command is easier to understand, however,
diff --git a/samcli/lib/telemetry/event.py b/samcli/lib/telemetry/event.py
index 60635172a3..c9e8b92d3e 100644
--- a/samcli/lib/telemetry/event.py
+++ b/samcli/lib/telemetry/event.py
@@ -5,13 +5,15 @@
 from enum import Enum
 from typing import List
 
+from samcli.local.common.runtime_template import INIT_RUNTIMES
+
 
 class EventName(Enum):
     """Enum for the names of available events to track."""
 
     USED_FEATURE = "UsedFeature"
     DEPLOY = "Deploy"
-    BUILD_RUNTIME = "BuildRuntime"
+    BUILD_FUNCTION_RUNTIME = "BuildFunctionRuntime"
 
 
 class EventType:
@@ -30,6 +32,7 @@ class EventType:
             "CreateChangeSetFailed",
             "CreateChangeSetSuccess",
         ],
+        EventName.BUILD_FUNCTION_RUNTIME: INIT_RUNTIMES,
     }
 
     @staticmethod
diff --git a/tests/unit/commands/buildcmd/test_build_context.py b/tests/unit/commands/buildcmd/test_build_context.py
index ef9f2ce913..5460d59812 100644
--- a/tests/unit/commands/buildcmd/test_build_context.py
+++ b/tests/unit/commands/buildcmd/test_build_context.py
@@ -1,6 +1,6 @@
 import os
 from unittest import TestCase
-from unittest.mock import patch, Mock, ANY, call
+from unittest.mock import MagicMock, patch, Mock, ANY, call
 
 from parameterized import parameterized
 
@@ -661,7 +661,7 @@ def test_run_sync_build_context(
             root_stack.stack_path: "./build_dir/template.yaml",
             child_stack.stack_path: "./build_dir/abcd/template.yaml",
         }
-        resources_mock.return_value = Mock()
+        resources_mock.return_value = MagicMock()
 
         builder_mock = ApplicationBuilderMock.return_value = Mock()
         artifacts = "artifacts"
diff --git a/tests/unit/lib/build_module/test_app_builder.py b/tests/unit/lib/build_module/test_app_builder.py
index 8889741251..e9b348db09 100644
--- a/tests/unit/lib/build_module/test_app_builder.py
+++ b/tests/unit/lib/build_module/test_app_builder.py
@@ -25,6 +25,7 @@
     DockerConnectionError,
 )
 from samcli.commands.local.cli_common.user_exceptions import InvalidFunctionPropertyType
+from samcli.lib.telemetry.event import EventName, EventTracker
 from samcli.lib.utils.architecture import X86_64, ARM64
 from samcli.lib.utils.packagetype import IMAGE, ZIP
 from samcli.lib.utils.stream_writer import StreamWriter
@@ -1476,13 +1477,20 @@ def setUp(self):
             Mock(), "/build/dir", "/base/dir", "/cache/dir", mode="mode", stream_writer=StreamWriter(sys.stderr)
         )
 
+    def tearDown(self):
+        EventTracker.clear_trackers()
+
     @parameterized.expand([([],), (["ExpFlag1", "ExpFlag2"],)])
+    @patch("samcli.lib.telemetry.event.EventType.get_accepted_values")
     @patch("samcli.lib.build.app_builder.LambdaBuilder")
     @patch("samcli.lib.build.app_builder.get_enabled_experimental_flags")
-    def test_must_use_lambda_builder(self, experimental_flags, experimental_flags_mock, lambda_builder_mock):
+    def test_must_use_lambda_builder(
+        self, experimental_flags, experimental_flags_mock, lambda_builder_mock, event_mock
+    ):
         experimental_flags_mock.return_value = experimental_flags
         config_mock = Mock()
         builder_instance_mock = lambda_builder_mock.return_value = Mock()
+        event_mock.return_value = ["runtime"]
 
         result = self.builder._build_function_in_process(
             config_mock,
@@ -1545,10 +1553,14 @@ def test_must_raise_on_error(self, lambda_builder_mock):
                 True,
             )
 
+    @patch("samcli.lib.telemetry.event.EventType.get_accepted_values")
     @patch("samcli.lib.build.app_builder.LambdaBuilder")
     @patch("samcli.lib.build.app_builder.get_enabled_experimental_flags")
-    def test_building_with_experimental_flags(self, get_enabled_experimental_flags_mock, lambda_builder_mock):
+    def test_building_with_experimental_flags(
+        self, get_enabled_experimental_flags_mock, lambda_builder_mock, event_mock
+    ):
         get_enabled_experimental_flags_mock.return_value = ["A", "B", "C"]
+        event_mock.return_value = ["runtime"]
         config_mock = Mock()
         self.builder._build_function_in_process(
             config_mock,
@@ -1600,11 +1612,18 @@ def setUp(self):
         )
         self.builder._parse_builder_response = Mock()
 
+    def tearDown(self):
+        EventTracker.clear_trackers()
+
+    @patch("samcli.lib.telemetry.event.EventType.get_accepted_values")
     @patch("samcli.lib.build.app_builder.LambdaBuildContainer")
     @patch("samcli.lib.build.app_builder.lambda_builders_protocol_version")
     @patch("samcli.lib.build.app_builder.LOG")
     @patch("samcli.lib.build.app_builder.osutils")
-    def test_must_build_in_container(self, osutils_mock, LOGMock, protocol_version_mock, LambdaBuildContainerMock):
+    def test_must_build_in_container(
+        self, osutils_mock, LOGMock, protocol_version_mock, LambdaBuildContainerMock, event_mock
+    ):
+        event_mock.return_value = "runtime"
         config = Mock()
         log_level = LOGMock.getEffectiveLevel.return_value = "foo"
         stdout_data = "container stdout response data"