Allow exporting metrics with resource gae_instance. (#253)

* Allow exporting metrics with resource gae_instance.

* Add gae_instance resources to testdata for metrics_proto_api_test.

Author: imccarten1

resource.go

@@ -40,6 +40,12 @@ const (
 	knativeRevisionName      = "revision_name"
 	knativeConfigurationName = "configuration_name"
 	knativeNamespaceName     = "namespace_name"
+
+	appEngineInstanceType = "gae_instance"
+
+	appEngineService  = "appengine.service.id"
+	appEngineVersion  = "appengine.version.id"
+	appEngineInstance = "appengine.instance.id"
 )
 
 var (
@@ -100,6 +106,14 @@ var awsResourceMap = map[string]string{
 	"aws_account": resourcekeys.CloudKeyAccountID,
 }
 
+var appEngineInstanceMap = map[string]string{
+	"project_id":  stackdriverProjectID,
+	"location":    resourcekeys.CloudKeyRegion,
+	"module_id":   appEngineService,
+	"version_id":  appEngineVersion,
+	"instance_id": appEngineInstance,
+}
+
 // Generic task resource.
 var genericResourceMap = map[string]string{
 	"project_id": stackdriverProjectID,
@@ -186,6 +200,9 @@ func defaultMapResource(res *resource.Resource) *monitoredrespb.MonitoredResourc
 	case res.Type == resourcekeys.HostType && res.Labels[resourcekeys.K8SKeyClusterName] != "":
 		result.Type = "k8s_node"
 		match = k8sNodeMap
+	case res.Type == appEngineInstanceType:
+		result.Type = appEngineInstanceType
+		match = appEngineInstanceMap
 	case res.Labels[resourcekeys.CloudKeyProvider] == resourcekeys.CloudProviderGCP:
 		result.Type = "gce_instance"
 		match = gcpResourceMap

resource_test.go

@@ -238,6 +238,29 @@ func TestDefaultMapResource(t *testing.T) {
 				},
 			},
 		},
+		// Convert to App Engine Instance.
+		{
+			input: &resource.Resource{
+				Type: appEngineInstanceType,
+				Labels: map[string]string{
+					stackdriverProjectID:        "proj1",
+					resourcekeys.CloudKeyRegion: "region1",
+					appEngineService:            "default",
+					appEngineVersion:            "version1",
+					appEngineInstance:           "inst1",
+				},
+			},
+			want: &monitoredrespb.MonitoredResource{
+				Type: "gae_instance",
+				Labels: map[string]string{
+					"project_id":  "proj1",
+					"location":    "region1",
+					"module_id":   "default",
+					"version_id":  "version1",
+					"instance_id": "inst1",
+				},
+			},
+		},
 		// Convert to Global.
 		{
 			input: &resource.Resource{

testdata/Resources/in.txt

@@ -121,3 +121,21 @@ labels: <
   key: "k8s.pod.name"
   value: "pod1"
 >
+---
+type: "gae_instance"
+labels: <
+  key: "appengine.service.id"
+  value: "default"
+>
+labels: <
+  key: "appengine.version.id"
+  value: "version1"
+>
+labels: <
+  key: "appengine.instance.id"
+  value: "inst1"
+>
+labels: <
+  key: "cloud.region"
+  value: "region1"
+>

testdata/Resources/out.txt

@@ -77,4 +77,21 @@ labels: <
 >
 ---
 type: "global"
-
+---
+type: "gae_instance"
+labels: <
+  key: "module_id"
+  value: "default"
+>
+labels: <
+  key: "version_id"
+  value: "version1"
+>
+labels: <
+  key: "instance_id"
+  value: "inst1"
+>
+labels: <
+  key: "location"
+  value: "region1"
+>

testdata/ResourcesWithMissingFields/in.txt

@@ -121,3 +121,22 @@ labels: <
   key: "k8s.pod.name"
   value: "pod1"
 >
+---
+type: "gae_instance"
+#labels: <
+#  key: "appengine.service.id"
+#  value: "default"
+#>
+labels: <
+  key: "appengine.version.id"
+  value: "version1"
+>
+labels: <
+  key: "appengine.instance.id"
+  value: "inst1"
+>
+labels: <
+  key: "cloud.region"
+  value: "region1"
+>
+

testdata/ResourcesWithMissingFields/out.txt

@@ -9,4 +9,5 @@ type: "global"
 type: "global"
 ---
 type: "global"
-
+---
+type: "global"