Exec 372 hide performance metrics project behind ff (#14811)

# Overview

Add feature flag for Performance Metrics project. 
Closes https://opentrons.atlassian.net/browse/EXEC-372

# Changelog 

- Add enablePerformanceMetrics feature flag in advanced settings
- Add migration function
- Update tests

api/src/opentrons/config/advanced_settings.py

@@ -240,6 +240,17 @@ class Setting(NamedTuple):
         robot_type=[RobotTypeEnum.FLEX],
         internal_only=True,
     ),
+    SettingDefinition(
+        _id="enablePerformanceMetrics",
+        title="Enable performance metrics",
+        description=(
+            "Do not enable."
+            " This is an Opentrons internal setting to collect performance metrics."
+            " Do not turn this on unless you are playing with the performance metrics system."
+        ),
+        robot_type=[RobotTypeEnum.OT2, RobotTypeEnum.FLEX],
+        internal_only=True,
+    ),
 ]
 
 if (
@@ -709,6 +720,16 @@ def _migrate31to32(previous: SettingsMap) -> SettingsMap:
     return newmap
 
 
+def _migrate32to33(previous: SettingsMap) -> SettingsMap:
+    """Migrate to version 33 of the feature flags file.
+
+    - Adds the enablePerformanceMetrics config element.
+    """
+    newmap = {k: v for k, v in previous.items()}
+    newmap["enablePerformanceMetrics"] = None
+    return newmap
+
+
 _MIGRATIONS = [
     _migrate0to1,
     _migrate1to2,
@@ -742,6 +763,7 @@ def _migrate31to32(previous: SettingsMap) -> SettingsMap:
     _migrate29to30,
     _migrate30to31,
     _migrate31to32,
+    _migrate32to33,
 ]
 """
 List of all migrations to apply, indexed by (version - 1). See _migrate below

api/src/opentrons/config/feature_flags.py

@@ -76,3 +76,7 @@ def enable_error_recovery_experiments() -> bool:
     return advs.get_setting_with_env_overload(
         "enableErrorRecoveryExperiments", RobotTypeEnum.FLEX
     )
+
+
+def enable_performance_metrics(robot_type: RobotTypeEnum) -> bool:
+    return advs.get_setting_with_env_overload("enablePerformanceMetrics", robot_type)

api/tests/opentrons/config/test_advanced_settings.py

@@ -34,6 +34,15 @@ def mock_settings_values_flex() -> Dict[str, Optional[bool]]:
     }
 
 
+@pytest.fixture
+def mock_settings_values_flex_all() -> Dict[str, Optional[bool]]:
+    return {
+        s.id: False
+        for s in advanced_settings.settings
+        if RobotTypeEnum.FLEX in s.robot_type
+    }
+
+
 @pytest.fixture
 def mock_settings_values_empty() -> Dict[str, Optional[bool]]:
     return {s.id: None for s in advanced_settings.settings}
@@ -57,25 +66,25 @@ def mock_settings(
 
 @pytest.fixture
 def mock_read_settings_file_ot2(
-    mock_settings_values_ot2: Dict[str, Optional[bool]],
+    mock_settings_values_ot2_all: Dict[str, Optional[bool]],
     mock_settings_version: int,
 ) -> Generator[MagicMock, None, None]:
     with patch("opentrons.config.advanced_settings._read_settings_file") as p:
         p.return_value = advanced_settings.SettingsData(
-            settings_map=mock_settings_values_ot2,
+            settings_map=mock_settings_values_ot2_all,
             version=mock_settings_version,
         )
         yield p
 
 
 @pytest.fixture
 def mock_read_settings_file_flex(
-    mock_settings_values_flex: Dict[str, Optional[bool]],
+    mock_settings_values_flex_all: Dict[str, Optional[bool]],
     mock_settings_version: int,
 ) -> Generator[MagicMock, None, None]:
     with patch("opentrons.config.advanced_settings._read_settings_file") as p:
         p.return_value = advanced_settings.SettingsData(
-            settings_map=mock_settings_values_flex,
+            settings_map=mock_settings_values_flex_all,
             version=mock_settings_version,
         )
         yield p
@@ -168,19 +177,19 @@ def test_get_all_adv_settings_empty(
 
 async def test_set_adv_setting(
     mock_read_settings_file_ot2: MagicMock,
-    mock_settings_values_ot2: MagicMock,
+    mock_settings_values_ot2_all: MagicMock,
     mock_write_settings_file: MagicMock,
     mock_settings_version: int,
     restore_restart_required: None,
 ) -> None:
-    for k, v in mock_settings_values_ot2.items():
+    for k, v in mock_settings_values_ot2_all.items():
         # Toggle the advanced setting
         await advanced_settings.set_adv_setting(k, not v)
         mock_write_settings_file.assert_called_with(
             # Only the current key is toggled
             {
                 nk: nv if nk != k else not v
-                for nk, nv in mock_settings_values_ot2.items()
+                for nk, nv in mock_settings_values_ot2_all.items()
             },
             mock_settings_version,
             CONFIG["feature_flags_file"],

api/tests/opentrons/config/test_advanced_settings_migration.py

@@ -8,7 +8,7 @@
 
 @pytest.fixture
 def migrated_file_version() -> int:
-    return 32
+    return 33
 
 
 # make sure to set a boolean value in default_file_settings only if
@@ -31,6 +31,7 @@ def default_file_settings() -> Dict[str, Any]:
         "estopNotRequired": None,
         "enableErrorRecoveryExperiments": None,
         "enableOEMMode": None,
+        "enablePerformanceMetrics": None,
     }
 
 
@@ -392,6 +393,18 @@ def v32_config(v31_config: Dict[str, Any]) -> Dict[str, Any]:
     return r
 
 
+@pytest.fixture
+def v33_config(v32_config: Dict[str, Any]) -> Dict[str, Any]:
+    r = v32_config.copy()
+    r.update(
+        {
+            "_version": 33,
+            "enablePerformanceMetrics": None,
+        }
+    )
+    return r
+
+
 @pytest.fixture(
     scope="session",
     params=[
@@ -429,6 +442,7 @@ def v32_config(v31_config: Dict[str, Any]) -> Dict[str, Any]:
         lazy_fixture("v30_config"),
         lazy_fixture("v31_config"),
         lazy_fixture("v32_config"),
+        lazy_fixture("v33_config"),
     ],
 )
 def old_settings(request: SubRequest) -> Dict[str, Any]:
@@ -522,4 +536,5 @@ def test_ensures_config() -> None:
         "disableOverpressureDetection": None,
         "enableErrorRecoveryExperiments": None,
         "enableOEMMode": None,
+        "enablePerformanceMetrics": None,
     }