[Feature] New metrics options (#548)

Author: ajanikow

Diff for: chart/kube-arangodb/templates/deployment-operator/role.yaml

@@ -30,7 +30,7 @@ rules:
       verbs: ["get", "list", "watch"]
     - apiGroups: ["monitoring.coreos.com"]
       resources: ["servicemonitors"]
-      verbs: ["get", "create", "delete"]
+      verbs: ["get", "create", "delete", "update"]
 
 {{- end }}
 {{- end }}

Diff for: chart/kube-arangodb/values.yaml

@@ -33,7 +33,7 @@ operator:
 
   images:
     base: alpine:3.11
-    metricsExporter: arangodb/arangodb-exporter:0.1.6
+    metricsExporter: arangodb/arangodb-exporter:0.1.7
     arango: arangodb/arangodb:latest
 rbac:
   enabled: true

Diff for: pkg/apis/deployment/v1/metrics_spec.go

@@ -17,6 +17,7 @@
 //
 // Copyright holder is ArangoDB GmbH, Cologne, Germany
 //
+// Adam Janikowski
 //
 
 package v1
@@ -33,12 +34,54 @@ type MetricsAuthenticationSpec struct {
 	JWTTokenSecretName *string `json:"jwtTokenSecretName,omitempty"`
 }
 
+// MetricsMode defines mode for metrics exporter
+type MetricsMode string
+
+func (m MetricsMode) New() *MetricsMode {
+	return &m
+}
+
+func (m MetricsMode) GetMetricsEndpoint() string {
+	switch m {
+	case MetricsModeInternal:
+		return k8sutil.ArangoExporterInternalEndpoint
+	default:
+		return k8sutil.ArangoExporterDefaultEndpoint
+	}
+}
+
+const (
+	// MetricsModeExporter exporter mode for old exporter type
+	MetricsModeExporter MetricsMode = "exporter"
+	MetricsModeSidecar  MetricsMode = "sidecar"
+	MetricsModeInternal MetricsMode = "internal"
+)
+
+func (m *MetricsMode) Get() MetricsMode {
+	if m == nil {
+		return MetricsModeExporter
+	}
+
+	return *m
+}
+
 // MetricsSpec contains spec for arangodb exporter
 type MetricsSpec struct {
 	Enabled        *bool                     `json:"enabled,omitempty"`
 	Image          *string                   `json:"image,omitempty"`
 	Authentication MetricsAuthenticationSpec `json:"authentication,omitempty"`
 	Resources      v1.ResourceRequirements   `json:"resources,omitempty"`
+	Mode           *MetricsMode              `json:"mode,omitempty"`
+
+	Port *uint16 `json:"port,omitempty"`
+}
+
+func (s *MetricsSpec) GetPort() uint16 {
+	if s == nil || s.Port == nil {
+		return k8sutil.ArangoExporterPort
+	}
+
+	return *s.Port
 }
 
 // IsEnabled returns whether metrics are enabled or not