How Can I Efficiently Parse Prometheus Exposition Format Data in Go?

Parsing Prometheus Data

To parse metrics obtained via HTTP GET as seen in the given Prometheus exposition format, there are two approaches to consider:

Using the expfmt Package

The expfmt package from the Prometheus team is specifically designed for parsing and encoding Prometheus Exposition Format data. It follows the EBNF syntax and provides a convenient way to extract the data.

Sample Input:

# HELP net_conntrack_dialer_conn_attempted_total
# TYPE net_conntrack_dialer_conn_attempted_total untyped
net_conntrack_dialer_conn_attempted_total{dialer_name="federate",instance="localhost:9090",job="prometheus"} 1 1608520832877

Sample Program:

package main

import (
    "fmt"
    "log"
    "os"

    dto "github.com/prometheus/client_model/go"
    "github.com/prometheus/common/expfmt"
)

func main() {
    reader, err := os.Open("path/to/input.txt")
    if err != nil {
        log.Fatalln(err)
    }

    var parser expfmt.TextParser
    mf, err := parser.TextToMetricFamilies(reader)
    if err != nil {
        log.Fatalln(err)
    }

    for k, v := range mf {
        fmt.Println("KEY:", k)
        fmt.Println("VAL:", v)
    }
}

Using ebnf Package

The ebnf package is another option for parsing the data, as it supports the EBNF syntax followed by Prometheus. However, expfmt is a more specific and efficient choice for parsing Prometheus data.

Formatting Note

Ensure that the input file uses line-feed characters (n) for line endings to follow the Prometheus text protocol specifications. Using other characters, such as r, will result in a protocol error.

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