How Can I Parse Prometheus Data Using the expfmt Package in Go?

Parsing Prometheus Data with expfmt

Extracting relevant data from Prometheus metrics can be achieved using the expfmt package, an open-source toolkit developed by the Prometheus authors. This package is designed specifically for parsing and encoding data in the Prometheus Exposition Format, an EBNF-based syntax.

To parse Prometheus data, you can follow the steps outlined below:

1. Install the expfmt Package:

go get github.com/prometheus/common/expfmt

2. Import the expfmt Package:

import "github.com/prometheus/common/expfmt"

3. Parse the Prometheus Data:

Use the expfmt.TextParser to parse the data into the corresponding metric family format:

parser := expfmt.TextParser{}
metricFamilies, err := parser.TextToMetricFamilies(reader)
if err != nil {
    log.Fatal(err)
}

4. Access the Parsed Data:

Once parsed, you can access each metric family using its name. Each metric family contains a collection of metrics, each of which has a set of labels and a time series:

for name, metricFamily := range metricFamilies {
    fmt.Println("Metric Family:", name)
    for _, metric := range metricFamily.GetMetric() {
        fmt.Println("\tMetric:", metric)
        for _, label := range metric.GetLabel() {
            fmt.Println("\t\tLabel:", label)
        }
        for _, point := range metric.GetCounter().GetValue() {
            fmt.Println("\t\tPoint:", point)
        }
    }
}

Example Usage:

path := "path/to/prometheus.txt"
mf, err := parseMF(path)
if err != nil {
    log.Fatal(err)
}

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

This sample usage parses the Prometheus data from the specified file and prints out the key-value pairs for each metric family.

Note: Ensure that your Prometheus data is formatted correctly with line-feed (n) characters as line terminators. Using other characters like carriage return (r) may lead to errors.

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