Checks that every target with a rate, irate or increase function uses $__rate_interval for the range of the data to process.
In short, this ensures that there is always a sufficient number of data points to calculate a useful result. A detailed description can be found in this Grafana blog post
There may be cases where one deliberately wants to show the rate or increase over a fixed period of time, such as the last 24hr etc. In those cases you may wish to create a lint exclusion for this rule.