From 43028076cd3704d625996f3cb8063fe405a5f3b2 Mon Sep 17 00:00:00 2001
From: "helder.junior" <helder.junior@wildlifestudios.com>
Date: Thu, 25 Jul 2024 15:40:59 -0300
Subject: [PATCH] Remove Server metrics from client

---
 metrics/metrics.go | 121 ---------------------------------------------
 1 file changed, 121 deletions(-)

diff --git a/metrics/metrics.go b/metrics/metrics.go
index c63b239..e38039a 100644
--- a/metrics/metrics.go
+++ b/metrics/metrics.go
@@ -24,46 +24,10 @@ package metrics
 
 import (
 	"errors"
-	"github.com/spf13/viper"
-	"net/http"
-	"time"
-
-	log "github.com/sirupsen/logrus"
-
-	"github.com/gorilla/mux"
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 var (
-	// APIResponseTime summary, observes the API response time as perceived by the server
-	APIResponseTime *prometheus.HistogramVec
-
-	// APIPayloadSize summary, observes the payload size of requests arriving at the server
-	APIPayloadSize *prometheus.HistogramVec
-
-	// APIRequestsSuccessCounter counter
-	APIRequestsSuccessCounter = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Namespace: "eventsgateway",
-			Subsystem: "api",
-			Name:      "requests_success_counter",
-			Help:      "A counter of succeeded api requests",
-		},
-		[]string{"route", "topic", "retry"},
-	)
-
-	// APIRequestsFailureCounter counter
-	APIRequestsFailureCounter = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Namespace: "eventsgateway",
-			Subsystem: "api",
-			Name:      "requests_failure_counter",
-			Help:      "A counter of failed api requests",
-		},
-		[]string{"route", "topic", "retry", "reason"},
-	)
-
 	// ClientRequestsResponseTime summary, observes the API response time as perceived by the client
 	ClientRequestsResponseTime *prometheus.HistogramVec
 
@@ -97,33 +61,8 @@ var (
 	},
 		[]string{"topic"},
 	)
-
-	APITopicsSubmission = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Namespace: "eventsgateway",
-		Subsystem: "api",
-		Name:      "topics_submission_total",
-		Help:      "Topic submissions sent to kafka",
-	},
-		[]string{"topic", "success"},
-	)
 )
 
-func defaultLatencyBuckets(config *viper.Viper) []float64 {
-	// in milliseconds
-	const configKey = "prometheus.buckets.latency"
-	config.SetDefault(configKey, []float64{3, 5, 10, 50, 100, 300, 500, 1000, 5000})
-
-	return config.Get(configKey).([]float64)
-}
-
-func defaultPayloadSizeBuckets(config *viper.Viper) []float64 {
-	// in bytes
-	configKey := "prometheus.buckets.payloadSize"
-	config.SetDefault(configKey, []float64{100, 1000, 5000, 10000, 50000, 100000, 500000, 1000000, 5000000})
-
-	return config.Get(configKey).([]float64)
-}
-
 // RegisterMetrics is a wrapper to handle prometheus.AlreadyRegisteredError;
 // it only returns an error if the metric wasn't already registered and there was an
 // actual error registering it.
@@ -140,63 +79,3 @@ func RegisterMetrics(collectors []prometheus.Collector) error {
 
 	return nil
 }
-
-// StartServer runs a metrics server inside a goroutine
-// that reports default application metrics in prometheus format.
-// Any errors that may occur will stop the server and log.Fatal the error.
-func StartServer(config *viper.Viper) {
-	APIPayloadSize = prometheus.NewHistogramVec(
-		prometheus.HistogramOpts{
-			Namespace: "eventsgateway",
-			Subsystem: "api",
-			Name:      "payload_size",
-			Help:      "payload size of API routes, in bytes",
-			Buckets:   defaultPayloadSizeBuckets(config),
-		},
-		[]string{"route", "topic"},
-	)
-
-	APIResponseTime = prometheus.NewHistogramVec(
-		prometheus.HistogramOpts{
-			Namespace: "eventsgateway",
-			Subsystem: "api",
-			Name:      "response_time_ms",
-			Help:      "the response time in ms of api routes",
-			Buckets:   defaultLatencyBuckets(config),
-		},
-		[]string{"route", "topic", "retry"},
-	)
-
-	collectors := []prometheus.Collector{
-		APIResponseTime,
-		APIPayloadSize,
-		APIRequestsFailureCounter,
-		APIRequestsSuccessCounter,
-		APITopicsSubmission,
-	}
-
-	err := RegisterMetrics(collectors)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	go func() {
-		envEnabled := config.GetString("prometheus.enabled")
-		if envEnabled != "true" {
-			log.Warn("Prometheus web server disabled")
-			return
-		}
-
-		r := mux.NewRouter()
-		r.Handle("/metrics", promhttp.Handler())
-
-		s := &http.Server{
-			Addr:           config.GetString("prometheus.port"),
-			ReadTimeout:    8 * time.Second,
-			WriteTimeout:   8 * time.Second,
-			MaxHeaderBytes: 1 << 20,
-			Handler:        r,
-		}
-		log.Fatal(s.ListenAndServe())
-	}()
-}