It could be that some of your scrapes are failing. With a 1 second scrape
interval, the scrape time limit will be 0.5 seconds by default, I believe.
What does a graph of
up{job="prometheus",instance="host.docker.internal:3000"}
scrape_duration_seconds{job="prometheus",instance="host.
docker.internal:3000"}
show? What happens if you change your scrape interval to 10 seconds?
How are you generating this "test_total" metric, i.e. what exporter is
running on port 3000? And can you show the definition of the "prometheus"
scrape job in your prometheus.yml ? (Aside: it would be normal to give the
scrape job a more descriptive name, since you're not scraping prometheus
itself)
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