add constant keys for resources.

Author: rghetia

resource/resourcekeys/const.go

@@ -0,0 +1,66 @@
+// Copyright 2019, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package resourcekeys contains well known type and label keys for resources.
+package resourcekeys // import "go.opencensus.io/resource/resourcekeys"
+
+// Constants for Kubernetes resources.
+const (
+	K8SType = "k8s"
+
+	// A uniquely identifying name for the Kubernetes cluster. Kubernetes
+	// does not have cluster names as an internal concept so this may be
+	// set to any meaningful value within the environment. For example,
+	// GKE clusters have a name which can be used for this label.
+	K8SKeyClusterName   = "k8s.cluster.name"
+	K8SKeyNamespaceName = "k8s.namespace.name"
+	K8SKeyPodName       = "k8s.pod.name"
+)
+
+// Constants for Container resources.
+const (
+	ContainerType = "container"
+
+	// A uniquely identifying name for the Container.
+	ContainerKeyName      = "container.name"
+	ContainerKeyImageName = "container.image.name"
+	ContainerKeyImageTag  = "container.image.tag"
+)
+
+// Constants for Cloud resources.
+const (
+	CloudType = "cloud"
+
+	// A uniquely identifying name for the Container.
+	CloudKeyProvider   = "cloud.provider"
+	CloudKeyAccountID  = "cloud.account.id"
+	CloudKeyRegion     = "cloud.region"
+	CloudKeyZone       = "cloud.zone"
+	CloudProviderAWS   = "aws"
+	CloudProviderGCP   = "gcp"
+	CloudProviderAZURE = "azure"
+)
+
+// Constants for Host resources.
+const (
+	HostType = "host"
+
+	// A uniquely identifying name for the host.
+	HostKeyName = "host.name"
+
+	// A hostname as returned by the 'hostname' command on host machine.
+	HostKeyHostName = "host.hostname"
+	HostKeyID       = "host.id"
+	HostKeyType     = "host.type"
+)