How to set the rate interval in the PROMQL similar to $__rate_interval by grafana. about prometheus-query-js HOT 3 CLOSED

I think this is a general question, not linked to this specific library.

You can try something like:

function generateQueries(rateInterval) {
   return {
      load15: `node_load15`,
      cpuUsage: `sum by(instance) (irate(node_cpu_seconds_total{instance="localhost:9100",job="node", mode="system"}[${rateInterval}])) / on(instance) group_left sum by (instance)((irate(node_cpu_seconds_total{instance="localhost:9100",job="node"}[${rateInterval}])))`,
      memoryUsage: `node_memory_MemTotal_bytes{instance="localhost:9100",job="node"} - node_memory_MemFree_bytes{instance="localhost:9100",job="node"} - (node_memory_Cached_bytes{instance="localhost:9100",job="node"} + node_memory_Buffers_bytes{instance="localhost:9100",job="node"} + node_memory_SReclaimable_bytes{instance="localhost:9100",job="node"})`,
  };
}

from prometheus-query-js.

I think this is a general question, not linked to this specific library.

You can try something like:

function generateQueries(rateInterval) {
   return {
      load15: `node_load15`,
      cpuUsage: `sum by(instance) (irate(node_cpu_seconds_total{instance="localhost:9100",job="node", mode="system"}[${rateInterval}])) / on(instance) group_left sum by (instance)((irate(node_cpu_seconds_total{instance="localhost:9100",job="node"}[${rateInterval}])))`,
      memoryUsage: `node_memory_MemTotal_bytes{instance="localhost:9100",job="node"} - node_memory_MemFree_bytes{instance="localhost:9100",job="node"} - (node_memory_Cached_bytes{instance="localhost:9100",job="node"} + node_memory_Buffers_bytes{instance="localhost:9100",job="node"} + node_memory_SReclaimable_bytes{instance="localhost:9100",job="node"})`,
  };
}

Here, the question is the rateInterval provided as params. how to calculate this interval dynamically. using given time range and step.

from prometheus-query-js.

oh! i see

Rate interval and step can be set independently. Rate interval could eventually be greater than or equal to step.

Step = (time frame end date - time frame start date) / 100 data points
Rate interval = step

Prometheus supports up to 11.000 data points per query. But most of time, such accuracy is pointless.

from prometheus-query-js.