Python prometheus exporter w/ timestamps

exporter.py

#!/usr/bin/env python3
import time

import prometheus_client
import prometheus_client.core

class Collector(prometheus_client.registry.Collector):
    def collect(self):
        now = time.time()
        now_1s = int(round(now))
        now_10s = now_1s - (now_1s % 10)

        m = prometheus_client.core.GaugeMetricFamily('time_mod_1', '')
        m.add_metric([], now_1s, timestamp=now_1s)
        yield m

        m = prometheus_client.core.GaugeMetricFamily('time_mod_10', '')
        m.add_metric([], now_10s, timestamp=now_10s)
        yield m


registry = prometheus_client.CollectorRegistry()
registry.register(Collector())
_, thread = prometheus_client.start_http_server(registry=registry, port=8080, addr='0.0.0.0')
thread.join()