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:
        timer = statsd.Timer("%s_posthog_cloud" % (settings.STATSD_PREFIX,))
        timer.start()
        properties = data.get("properties", {})
        if data.get("$set"):
            properties["$set"] = data["$set"]
        person_uuid = UUIDT()
        event_uuid = UUIDT()
        ts = handle_timestamp(data, now, sent_at)
        handle_identify_or_alias(data["event"], properties, distinct_id, team_id)
        if data["event"] == "$snapshot":
            create_session_recording_event(
                uuid=event_uuid,
                team_id=team_id,
                distinct_id=distinct_id,