> Can I set a scraping interval of a job to 20 minutes? At the moment, one can't adjust query delta look-back per scrape job.
It's not recommended to scrape less frequently than once every 2 minutes. With the default 5-minute lookback, this gives a degree of robustness against losing a single scrape. In theory, you could set the lookback to say 50 minutes and then scrape every 20 minutes. Like I say, it's not recommended, and as you've observed, this is a global setting. Is there a particular reason why scraping every 2 minutes can't be done? Don't worry about TSDB storage. Prometheus does delta-compression, so if repeated scrapes of the same exporter give the same value, the difference between them is zero and it uses hardly any storage at all (just the timestamp deltas). If the problem is that your scrape task is expensive to run, then run it from a cronjob and put the output somewhere where it can be scraped (e.g. node_exporter textfile collector). This is a good idea anyway for expensive metrics, as it avoids DoS problems if multiple clients are scraping the same exporter. I can't really answer your other questions about staleness markers. My understanding is that staleness markers are not exposed to users <https://www.robustperception.io/staleness-and-promql> (even though internally they're a special kind of NaN); so if you query a timeseries which is stale, I would expect that vector result would not include that timeseries - it would be just as if the timeseries did not exist at that point in time. In other words, I'd expect that count(foo) would give the number of timeseries for metric "foo" which are not stale. But that's just my expectation; you should test it if it matters to you. It's completely different from the question you originally raised about stopping and restarting prometheus. -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/6cee7e3b-4744-4a2f-95c7-82ff710ce110n%40googlegroups.com.

