In local development StatsD is raising `OSError: [WinError 10049] The requested address is not valid in its context` when env variable `STATSD_HOST` is not set. This seems to just be a Windows issue as the error suggests, because I can't get it to happen inside Docker.

This is happening because the default empty string of `settings.STATSD_HOST` gets set as the default host of `statsd.Connection`, and the empty string is not a valid host name in Windows.

https://github.com/PostHog/posthog/blob/1357df0c137e36478be19a1b8739dcdba93d2327/posthog/settings.py#L181
https://github.com/PostHog/posthog/blob/1ec12f26e707489e77077be029ddb79ceeefd944/posthog/celery.py#L35

StatsD sets the default `host` value to `'localhost'`, and restoring this default fixes the errors. I can make a PR tomorrow, but just wanted to check on this:
https://github.com/PostHog/posthog/blob/1357df0c137e36478be19a1b8739dcdba93d2327/posthog/settings.py#L217-L219

I can change it to `if os.environ.get("STATSD_HOST", False):`, but it might make more sense as a separate env variable like `STATSD_ENABLED`. My only concern with that is it's probably a breaking change. Are there any better options?



ee/clickhouse/process_event.py
event_uuid: UUID,
    person_uuid: UUID,
    ip: str,
    site_url: str,
    team_id: int,
    event: str,
    distinct_id: str,
    properties: Dict,
    timestamp: datetime.datetime,
) -> None:
    elements = properties.get("$elements")
    elements_list = []
    if elements:
        del properties["$elements"]
        elements_list = [
            Element(
                text=el["$el_text"][0:400] if el.get("$el_text") else None,
                tag_name=el["tag_name"],
                href=el["attr__href"][0:2048] if el.get("attr__href") else None,
                attr_class=el["attr__class"].split(" ") if el.get("attr__class") else None,
                attr_id=el.get("attr__id"),
                nth_child=el.get("nth_child"),