CODEWITHSUNDEEP
goprometheusvictoriametrics
yzhengwei
yzhengwei

Reputation: 75

How to query all time series of a given metrics in prometheus?

How to query the raw time series values of a specified metrics in prometheus without step? For example, I want to query how many datapoints are actually available in 1 minute, but when I specify step as 15s, 4 results will be generated regardless of the number of datapoints

package main

import (
    "context"
    "fmt"
    "github.com/prometheus/client_golang/api"
    v1 "github.com/prometheus/client_golang/api/prometheus/v1"
    "log"
    "time"
)

var (
    prometheus string        = "http://10.22.5.54:8481/select/0/prometheus"
    timeout    time.Duration = time.Second * 30
)

func main() {

    client, err := api.NewClient(api.Config{Address: prometheus})
    if err != nil {
        log.Fatalln("Error connect to the prometheus: ", err)
    }

    v1api := v1.NewAPI(client)
    ctx, cancel := context.WithTimeout(context.Background(), timeout)
    defer cancel()

    result, warnings, err := v1api.QueryRange(ctx, "up{app=\"activity-api\"}", v1.Range{Start: time.Now().Add(-time.Minute * 1), End: time.Now(), Step: time.Second * 15})

    if err != nil {
        log.Printf("Error querying Prometheus: %s\n", err)
    }
    if len(warnings) > 0 {
        log.Printf("Warnings: %s", warnings)
    }

    fmt.Println(result)
}

Upvotes: 1

Views: 3640

Answers (1)

valyala
valyala

Reputation: 18084

You need to use v1api.Query instead of v1api.QueryRange, and add the needed interval in square brackets at the end of series selector. For example, the following query should return raw samples for time series matching up{app="activity-api"} for the last 15 seconds ending at the given time.

t := time.Now()
result, warnings, err := v1api.Query(ctx, `up{app="activity-api"}[15s]`, t)

See more details here.

Internally the github.com/prometheus/client_golang package just queries /api/v1/query HTTP endpoint, so it may be easier to just issue HTTP request to this endpoint without the need to figure out how to use github.com/prometheus/client_golang. For example, the following command will return raw samples from VictoriaMetrics cluster:

curl http://10.22.5.54:8481/select/0/prometheus/api/v1/query -d 'up{app="activity-api"}[15s]'

VictoriaMetrics also provides APIs for exporting raw samples.

See also https://valyala.medium.com/analyzing-prometheus-data-with-external-tools-5f3e5e147639 .

Upvotes: 2

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