Thank you all for replying. Very crystal clear answers. On Friday, February 28, 2020 at 2:16:46 AM UTC+5:30, Brian Candler wrote: > > On Thursday, 27 February 2020 18:40:38 UTC, adi garg wrote: >> >> Thanks a lot, Brian, that clears a lot of things for me. Just one more >> doubt is there a way to look at the current scraped metrics as I am not >> sure but I think that Prometheus stores metrics in 2 hours chunk in the >> memory(Ram) and after then sends them to the storage(SSD). >> > > That's transparent to you. Queries will merge results from the head or > the stored chunks automatically. > > >> Like how can I confirm this that my Prometheus is scraping all those >> targets? >> > > The API can give you a list of targets being scraped: > https://prometheus.io/docs/prometheus/latest/querying/api/#querying-target-metadata > > But in general, all you need to do is to perform an instant query for the > metric "up". This is a metric generated by prometheus on every scrape > attempt, and has value 1 for successful scrape or 0 for failed scrape. > > The instant query "up" will give you the most recent value of that > metric. The query "timestamp(up)" will give you the time it was set, i.e. > the time of the last scrape attempt, and "time() - timestamp(up)" will give > you the age in seconds since the last scrape. > > See timestamp() > <https://prometheus.io/docs/prometheus/latest/querying/functions/#timestamp> > function. > > >> Moreover, that querying part can either be done by promql locally or >> using grafana right? >> >> > Yes, grafana just sends promQL queries to the prometheus API - the same as > promtool does, and indeed the same as prometheus' own GUI does. > >
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