A good reference is the official Prometheus docs on writing exporters https://prometheus.io/docs/instrumenting/writing_exporters/#scheduling
On Fri, May 22, 2020 at 2:52 PM Cory Robinson <[email protected]> wrote: > Hi Prometheus Users, > > I am working on writing a (my first) custom exporter that collects metrics > from an application's REST API endpoint that I have no control over. > Now that I am half way through it, I am questioning myself whether I am > taking the right approach to get the collected metrics published to my > /metrics endpoint for Prometheus to scrape, and I could use some guidance. > Let me attempt to explain what I'm doing. > > My approach: > Metrics are published on a /metrics endpoint that Prometheus will scrape > every 15 minutes. But, how do metrics get to the /metrics endpoint? > My idea was to have my exporter collect data from an external REST API on > it's own schedule and publish the metrics to the /metrics endpoint so they > would be ready and waiting for Prometheus to scrape them. > This way, Prometheus would be scraping /metrics on it's own > scrape_interval = 15m, and my exporter would be collecting data and > publishing to /metrics on it's own export_interval = 15m. I might even lag > ahead the export_interval by a minute or so, because each of the ~10 API > calls it makes could take up ~20 seconds to complete. > > Is it necessary to have the 2 different schedules? Or would the Prometheus > scrape_interval schedule be expected to trigger the API calls in the > exporter? > Basically I don't want to bog down that external applications performance > or look like a DOS attack on the external application by continuously > barraging it with requests when I only need the data once every 15 minutes > or so. > > Hopefully I explained this alright, but let me know if you need any > clarification. > > Thanks, > Cory > > -- > 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/a119b024-37a0-4f5a-a239-990fc35c0cbc%40googlegroups.com > <https://groups.google.com/d/msgid/prometheus-users/a119b024-37a0-4f5a-a239-990fc35c0cbc%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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/CABbyFmrH4iafW5UvVGeOPxMCqg_mDQ5o78GzTj6tjnZ5q1_3tw%40mail.gmail.com.
