Use client generator to generate all k8s clients and add respective client-go metrics (#2668)

* Define client generator to generate all k8s clients
* Increase QPS and burst values
* Capture client-go metrics
* Support for controller runtime metrics

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/storagesvc/metrics.go

@@ -2,19 +2,20 @@ package storagesvc
 
 import (
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
+
+	"github.com/fission/fission/pkg/utils/metrics"
 )
 
 var (
 	functionLabels = []string{}
-	totalArchives  = promauto.NewGaugeVec(
+	totalArchives  = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name: "fission_archives",
 			Help: "Number of archives stored",
 		},
 		functionLabels,
 	)
-	totalMemoryUsage = promauto.NewGaugeVec(
+	totalMemoryUsage = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name: "fission_archive_memory_bytes",
 			Help: "Amount of memory consumed by archives",
@@ -22,3 +23,9 @@ var (
 		functionLabels,
 	)
 )
+
+func init() {
+	registry := metrics.Registry
+	registry.MustRegister(totalArchives)
+	registry.MustRegister(totalMemoryUsage)
+}