Hi folks, any ideas on this issue I am facing with custom collectors using
the Python client?
Thanks,
Cory
On Saturday, June 20, 2020 at 10:48:43 AM UTC-5, Cory Robinson wrote:
>
> Hi,
>
> When implementing a simple custom collector with the python client,
> refreshing the browser will generate 2 successive collections.
> This tends to cause "duplicate" unneeded successive, say, REST API calls
> for example, when collecting metrics from REST API endpoints real-world
> scenarios.
> How can this be avoided?
>
> Here is some sample case below that exhibits this behavior...
>
> import time
> from prometheus_client import start_http_server
> from prometheus_client.core import
> GaugeMetricFamily, CounterMetricFamily, REGISTRY
>
> class CustomCollector(object):
> def collect(self):
> c = GaugeMetricFamily('my_gauge', 'Help text', labels=['foo'])
> c.add_metric(['bar'], 1.7)
> print("{}, {}".format(time.time(), c))
> yield c
>
> def describe(self):
> return []
>
> if __name__ == '__main__':
> start_http_server(8000)
> REGISTRY.register(CustomCollector())
> while True:
> time.sleep(1)
>
> Console output at webpage refresh on localhost:8000:
> > python test.py
> 1592667742.5491908, Metric(my_gauge, Help text, gauge, ,
> [Sample(name='my_gauge', labels={'foo': 'bar'}, value=1.7, timestamp=None,
> exemplar=None)])
> 1592667742.6191902, Metric(my_gauge, Help text, gauge, ,
> [Sample(name='my_gauge', labels={'foo': 'bar'}, value=1.7, timestamp=None,
> exemplar=None)])
>
> Notice the times come in very quick succession. When collecting real
> metrics from a REST API endpoint, the metrics displayed on the webpage will
> always be the first metric, not the 2nd succession.
>
> Thanks,
> Cory
>
>
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