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
distinct_id: str,
    ip: str,
    site_url: str,
    data: dict,
    team_id: int,
    now: datetime.datetime,
    sent_at: Optional[datetime.datetime],
) -> None:
    data = {
        "distinct_id": distinct_id,
        "ip": ip,
        "site_url": site_url,
        "data": json.dumps(data),
        "team_id": team_id,
        "now": now.strftime("%Y-%m-%d %H:%M:%S.%f"),
        "sent_at": sent_at.strftime("%Y-%m-%d %H:%M:%S.%f") if sent_at else "",
    }
    p = KafkaProducer()
    p.produce(topic=KAFKA_EVENTS_WAL, data=data)