Convert to using [$__rate_interval] about grafana-dashboards

[candlerb]

Presumably you have a reasonably modern version of grafana?

My guess is that you've not set the correct scrape interval in the grafana data source you've defined.

Look under Configuration > Data Sources > (your prometheus)

Suppose the scrape interval is set to 15s here (which is the default if you haven't set it) - but you're actually scraping at 1 minute intervals in your prometheus config. $__rate_interval will drop to (graph_step+15s), eventually reaching a minimum value, which is 4 x datasource interval = 1m

At this point you're doing rate(...)[1m] which will display no data if you are scraping at 1 minute intervals; you need at least rate(...)[2m]. You can achieve this by setting the data source interval to 30s.

You can set the data source interval to the "correct" value of 1m to match your scraping, but that will give you a rate calculated over the points in a 4m window, which is actually the rate over 3 minutes (from the first to last data point in that window). I think this is wrong, and I raised it here, but that was rejected.

[rfrail3]

That is an annoying thing, great to know that now there is a realiable alternative.

Definitively is the way to go, but the new release requirement can be a trouble for the people that doesn't have the version updated.

But, as I updated the dashboard version on #70 to 7.3.7, it can be only on this repo for a few weeks or months until I publish it on Grafana website, giving time to have an updated userbase.

[alarsyo]

I'm getting "No data" when zooming in using this change. It works for "last 24 hours" and "last 12 hours" but breaks under 6h and less :/

Reverting to irate and 5m fixes it

[alarsyo]

You're right, that was absolutely it! Thanks for the detailed answer, this makes sense now!