On Sunday, 18 October 2020 16:27:56 UTC+1, [email protected] wrote:
>
> Is it possible to tell prometheus to keep the last metric until new one 
> scraped by prometheus so the graph would be connected
>

No, because these are two different timeseries.

You say "this metric is generated once in a while", but don't say how it's 
generated or scraped.

To avoid the staleness problem, you need to scrape every 2 minutes or 
faster.  You don't necessarily need to *generate* it every 2 minutes - you 
could run a cronjob every 30 minutes (say) which writes the metric into a 
file, which is exported by node_exporter textfile collector.  But you need 
to *scrape* it every 2 minutes.

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