PLT-4357 adding performance monitoring (#4622)

* WIP

* WIP

* Adding metrics collection

* updating vendor packages

* Adding metrics to config

* Adding admin console page for perf monitoring

* Updating glide

* switching to tylerb/graceful

model/license.go

@@ -39,6 +39,7 @@ type Features struct {
 	Office365OAuth       *bool `json:"office365_oauth"`
 	Compliance           *bool `json:"compliance"`
 	Cluster              *bool `json:"cluster"`
+	Metrics              *bool `json:"metrics"`
 	CustomBrand          *bool `json:"custom_brand"`
 	MHPNS                *bool `json:"mhpns"`
 	SAML                 *bool `json:"saml"`
@@ -55,6 +56,7 @@ func (f *Features) ToMap() map[string]interface{} {
 		"office365":    *f.Office365OAuth,
 		"compliance":   *f.Compliance,
 		"cluster":      *f.Cluster,
+		"metrics":      *f.Metrics,
 		"custom_brand": *f.CustomBrand,
 		"mhpns":        *f.MHPNS,
 		"saml":         *f.SAML,
@@ -104,6 +106,11 @@ func (f *Features) SetDefaults() {
 		*f.Cluster = *f.FutureFeatures
 	}
 
+	if f.Metrics == nil {
+		f.Metrics = new(bool)
+		*f.Metrics = *f.FutureFeatures
+	}
+
 	if f.CustomBrand == nil {
 		f.CustomBrand = new(bool)
 		*f.CustomBrand = *f.FutureFeatures