Go

Monitor Go application runtime metrics — goroutines, GC frequency, heap allocation, and CPU — using the built-in prometheus/client_golang library.

Key Metrics

Metric	Description
go_goroutines	Number of live goroutines
go_memstats_heap_alloc_bytes	Heap bytes currently allocated
go_gc_duration_seconds	GC pause duration histogram
go_memstats_alloc_bytes_total	Bytes allocated total (counter)
go_memstats_gc_cpu_fraction	Fraction of CPU used by GC
process_cpu_seconds_total	Total CPU usage

Prerequisites

• Go 1.17+
• github.com/prometheus/client_golang

Configuration

Option A — client_golang

go get github.com/prometheus/client_golang/prometheus
go get github.com/prometheus/client_golang/prometheus/promhttp

package main

import (
    "net/http"
    "github.com/prometheus/client_golang/prometheus/promhttp"
)

func main() {
    http.Handle("/metrics", promhttp.Handler())
    http.ListenAndServe(":2112", nil)
}

Prometheus scrape

scrape_configs:
  - job_name: go_app
    static_configs:
      - targets: ['localhost:2112']

remote_write:
  - url: https://<region>.xscalerlabs.com/api/v1/push
    headers:
      X-Scope-OrgID: <tenant-id>
    basic_auth:
      password: <api-token>

Option B — Grafana Alloy

prometheus.scrape "go_app" {
  targets    = [{"__address__" = "localhost:2112"}]
  forward_to = [prometheus.remote_write.xscaler.receiver]
}

prometheus.remote_write "xscaler" {
  endpoint {
    url = "https://<region>.xscalerlabs.com/api/v1/push"
    headers = { "X-Scope-OrgID" = "<tenant-id>" }
    basic_auth { password = "<api-token>" }
  }
}

Option C — OpenTelemetry Collector

receivers:
  prometheus:
    config:
      scrape_configs:
        - job_name: go_app
          static_configs:
            - targets: ['localhost:2112']

exporters:
  prometheusremotewrite:
    endpoint: https://<region>.xscalerlabs.com/api/v1/push
    headers:
      Authorization: Bearer <api-token>
      X-Scope-OrgID: <tenant-id>

service:
  pipelines:
    metrics:
      receivers: [prometheus]
      exporters: [prometheusremotewrite]

Logs

Collect application stdout/stderr — pipe your process output to a log file and tail it with Alloy. Add the following to your Alloy config, adjusting __path__ to match your application's log file location:

local.file_match "go_logs" {
  path_targets = [{
    __address__ = "localhost",
    __path__    = "/var/log/go/app.log",
    instance    = constants.hostname,
    job         = "integrations/go",
  }]
}

loki.source.file "go_logs" {
  targets    = local.file_match.go_logs.targets
  forward_to = [loki.write.xscaler.receiver]
}

loki.write "xscaler" {
  endpoint {
    url = "https://euw1-01.l.xscalerlabs.com/api/v1/logs/push"

    http_client_config {
      authorization {
        type        = "Bearer"
        credentials = env("XSCALER_TOKEN")
      }
    }

    headers = { "X-Scope-OrgID" = env("XSCALER_TENANT_ID") }
  }
}