feat(flags): document python UnleashIntegration (#12216)

* feat(flags): document python UnleashIntegration

* ref versioning note

* Reword note on get_variant

* get_variant example

* import os

* Move to integrations folder

* Add to integrations index

* Review comments

* Update docs/platforms/python/integrations/unleash/index.mdx

Co-authored-by: Colton Allen <cmanallen90@gmail.com>

* Fix merge conflict

* Remove unnecessary documentation of unleash client initialization

* Remove os import

* Add unleash imports

---------

Co-authored-by: Anton Pirker <anton.pirker@sentry.io>
Co-authored-by: Colton Allen <cmanallen90@gmail.com>
Co-authored-by: Colton Allen <colton.allen@sentry.io>

Author: 3 people

docs/platforms/python/integrations/feature-flags/unleash.mdx

@@ -0,0 +1,62 @@
+---
+title: Unleash
+description: "Learn how to use Sentry with Unleash."
+---
+
+<PlatformContent includePath="feature-flags/prerelease-alert" />
+
+The [Unleash](https://www.getunleash.io/) integration tracks feature flag evaluations produced by the Unleash SDK. These evaluations are held in memory and sent to Sentry for review and analysis if an error occurs. **At the moment, we only support boolean flag evaluations.**
+
+## Install
+
+Install `sentry-sdk` (>=2.19.3) and `UnleashClient` (>=6.0.1) from PyPI.
+
+```bash
+pip install --upgrade sentry-sdk UnleashClient
+```
+
+## Configure
+
+Add `UnleashIntegration` to your `integrations` list:
+
+```python
+import sentry_sdk
+from sentry_sdk.integrations.unleash import UnleashIntegration
+
+sentry_sdk.init(
+    dsn="___PUBLIC_DSN___",
+    integrations=[UnleashIntegration()],
+)
+```
+
+For more information on how to use Unleash, read Unleash's [Python reference](https://docs.getunleash.io/reference/sdks/python) and [quickstart guide](https://docs.getunleash.io/quickstart).
+
+## Verify
+
+Test the integration by evaluating a feature flag using your Unleash SDK before capturing an exception.
+
+```python {tabTitle: Python, using is_enabled}
+import sentry_sdk
+from UnleashClient import UnleashClient
+
+unleash_client = UnleashClient(...)  # See Unleash quickstart.
+test_flag_enabled = unleash_client.is_enabled("test-flag")
+
+sentry_sdk.capture_exception(Exception("Something went wrong!"))
+```
+
+```python {tabTitle: Python, using get_variant}
+import sentry_sdk
+from UnleashClient import UnleashClient
+
+unleash_client = UnleashClient(...)  # See Unleash quickstart.
+test_flag_variant = unleash_client.get_variant("test-flag")
+test_flag_enabled = test_flag_variant["enabled"]
+
+sentry_sdk.capture_exception(Exception("Something went wrong!"))
+```
+
+Visit the [Sentry website](https://sentry.io/issues/) and confirm that your error
+event has recorded the feature flag "test-flag", and its value is equal to `test_flag_enabled`.
+
+<PlatformContent includePath="feature-flags/next-steps" />

docs/platforms/python/integrations/index.mdx

@@ -65,6 +65,7 @@ The Sentry SDK uses integrations to hook into the functionality of popular libra
 | ----------------------------------------------------------------------------------------------------------------------- | :--------------: |
 | <LinkWithPlatformIcon platform="python" label="LaunchDarkly" url="/platforms/python/integrations/feature-flags/launchdarkly" /> |                  |
 | <LinkWithPlatformIcon platform="python"  label="OpenFeature"  url="/platforms/python/integrations/feature-flags/openfeature" />  |                  |
+| <LinkWithPlatformIcon platform="python"  label="Unleash"  url="/platforms/python/integrations/feature-flags/unleash" />  |                  |
 
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