## Bug description

I set up a self-hosted instance via AWS cloudformation and updated it recently.

The page /instance/status fails to load for me.

## Expected behavior

Instance status page loads successfully.

## How to reproduce

- Set up a cloudformation instance
- ???
- Visit /instance/status
- See report on 500 error from backend

## Environment

- 1.15.1 (latest docker container)

## Additional context

Not able to provide a lot of useful context here due to https://github.com/PostHog/deployment/issues/32

#### *Thank you* for your bug report – we love squashing them!

posthog/settings.py
try:
        return os.environ[key]
    except KeyError:
        raise ImproperlyConfigured(f'The environment var "{key}" is absolutely required to run this software')
def get_list(text: str) -> List[str]:
    if not text:
        return []
    return [item.strip() for item in text.split(",")]
def get_bool_from_env(name: str, default_value: bool) -> bool: