"""Demo service: logs a heartbeat line every 10 seconds."""

import logging
import time

logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")


def greeting(n: int) -> str:
    return f"hello #{n}"


def main() -> None:
    n = 0
    while True:
        n += 1
        logging.info(greeting(n))
        time.sleep(10)


if __name__ == "__main__":
    main()