monitor(app).start_server() runs server which must not be using in production - having memory leaks issues

[vartagg]

I found that this way of prometheus metrics server starting, which code is

class _ThreadingSimpleServer(ThreadingMixIn, HTTPServer):
    """Thread per request HTTP server."""
def start_http_server(port, addr='', registry=REGISTRY):
    """Starts an HTTP server for prometheus metrics as a daemon thread"""
    CustomMetricsHandler = MetricsHandler.factory(registry)
    httpd = _ThreadingSimpleServer((addr, port), CustomMetricsHandler)
    t = threading.Thread(target=httpd.serve_forever)
    t.daemon = True
    t.start()

is starting the server, which has memory leaks. I found it by profiling app with tracemalloc library. This server is infinitely opening new threads. I think this behavior must be specified in the docs.