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Under utils/common.py, 

TIMESTAMP_FORMAT_MILLIS = '%Y-%m-%dT%H:%M:%S.%fZ'

The %f produces time with microseconds, for example: 2020-03-18T19:43:18.115783Z.


However, when interacting the AWS s3 and sns apis, I receive DateTimes like this:

2020-03-02T22:32:13.240Z
i.e. milliseconds. 

This seems like a simple change to the utils. TIMESTAMP_FORMAT_MILLIS is named as if it should be millis as well. This is seems like a simple change. Is there a reason it should be microseconds?
with closing(socket.socket(socket.AF_INET, nw_protocol)) as sock:
            sock.settimeout(1)
            if nw_protocol == socket.SOCK_DGRAM:
                try:
                    if port == 53:
                        dnshost = '127.0.0.1' if host == 'localhost' else host
                        resolver = dns.resolver.Resolver()
                        resolver.nameservers = [dnshost]
                        resolver.timeout = 1
                        resolver.lifetime = 1
                        answers = resolver.query('google.com', 'A')
                        assert len(answers) > 0
                    else:
                        sock.sendto(bytes(), (host, port))
                        sock.recvfrom(1024)
                except Exception:
                    return False
            elif nw_protocol == socket.SOCK_STREAM:
                result = sock.connect_ex((host, port))
                if result != 0:
                    return False
    if 'tcp' not in protocols or not http_path:
        return True
    url = '%s://%s:%s%s' % (protocol, host, port, http_path)
    try:
        response = safe_requests.get(url)
        return not expect_success or response.status_code < 400
    except Exception:
        return False
def wait_for_port_open(port, http_path=None, expect_success=True, retries=10, sleep_time=0.5):