feat(flags): document python FeatureFlagsIntegration for custom flag tracking

docs/platforms/python/feature-flags/index.mdx

@@ -16,5 +16,6 @@ Evaluation tracking requires enabling an SDK integration. Integrations are provi
 
 - [OpenFeature](/platforms/python/integrations/openfeature/)
 - [LaunchDarkly](/platforms/python/integrations/launchdarkly/)
+- [Manual Tracking](/platforms/python/integrations/featureflags/) - if you use an unsupported or in-house provider, you may track evaluations through an API.
 
 <PlatformContent includePath="feature-flags/enable-change-tracking" />

docs/platforms/python/integrations/featureflags/index.mdx

@@ -0,0 +1,50 @@
+---
+title: Feature Flags
+description: "Learn how to attach custom feature flag data to Sentry error events."
+---
+
+<PlatformContent includePath="feature-flags/prerelease-alert" />
+
+The Feature Flags integration allows you to manually track feature flag evaluations through an API. These evaluations are held in memory, and in the event an error occurs, sent to Sentry for review and analysis.
+**At the moment, we only support boolean flag evaluations.**
+
+## Install
+
+Install `sentry-sdk` (>=TODO:) from PyPI.
+
+```bash
+pip install --upgrade 'sentry-sdk'
+```
+
+## Configure
+
+Add `FeatureFlagsIntegration()` to your `integrations` list:
+
+```python
+import sentry_sdk
+from sentry_sdk.integrations.featureflags import FeatureFlagsIntegration
+
+sentry_sdk.init(
+    dsn="___PUBLIC_DSN___",
+    integrations=[
+        FeatureFlagsIntegration(),
+    ],
+)
+```
+
+## Verify
+
+The integration is tested by calling the `add_feature_flag` API before capturing an exception.
+
+```python
+import sentry_sdk
+from sentry_sdk.integrations.featureflags import add_feature_flag
+
+add_feature_flag('test-flag', False)
+
+sentry_sdk.capture_exception(Exception("Something went wrong!"))
+```
+
+Visit the Sentry website and confirm that your error event has recorded the feature flag "test-flag" and its value "false".
+
+<PlatformContent includePath="feature-flags/next-steps" />

docs/platforms/python/integrations/index.mdx

@@ -59,12 +59,13 @@ The Sentry SDK uses integrations to hook into the functionality of popular libra
 | <LinkWithPlatformIcon platform="python.rq"       label="RQ"             url="/platforms/python/integrations/rq" />       |        ✓         |
 | <LinkWithPlatformIcon platform="python.ray"      label="Ray"            url="/platforms/python/integrations/ray" />      |                  |
 
-## Feature Flags
+### Feature Flags
 
 |                                                                                                                         | **Auto-enabled** |
 | ----------------------------------------------------------------------------------------------------------------------- | :--------------: |
-| <LinkWithPlatformIcon platform="launchdarkly" label="LaunchDarkly" url="/platforms/python/integrations/launchdarkly" /> |                  |
-| <LinkWithPlatformIcon platform="openfeature"  label="OpenFeature"  url="/platforms/python/integrations/openfeature" />  |                  |
+| <LinkWithPlatformIcon platform="python" label="LaunchDarkly" url="/platforms/python/integrations/launchdarkly" /> |                  |
+| <LinkWithPlatformIcon platform="python"  label="OpenFeature"  url="/platforms/python/integrations/openfeature" />  |                  |
+| <LinkWithPlatformIcon platform="python"  label="FeatureFlags (Manual Tracking)"  url="/platforms/python/integrations/featureflags" />  |                  |
 
 ### Cloud Computing