Add host label to Proxy and Devapp monitored resources (#215)

Author: msukruth

retrieval/resource_map.go

@@ -99,6 +99,7 @@ var DevappResourceMap = ResourceMap{
 		"__meta_kubernetes_pod_label_org": constValue("org"),
 		"__meta_kubernetes_pod_label_env": constValue("env"),
 		"api_product_name":                constValue("api_product_name"),
+		"__meta_kubernetes_pod_name":      constValue("host"),
 	},
 }
 
@@ -112,6 +113,7 @@ var ProxyResourceMap = ResourceMap{
 		"__meta_kubernetes_pod_label_env": constValue("env"),
 		"proxy_name":                      constValue("proxy_name"),
 		"revision":                        constValue("revision"),
+		"__meta_kubernetes_pod_name":      constValue("host"),
 	},
 }
 

retrieval/resource_map_test.go

@@ -138,6 +138,7 @@ func TestTranslateDevapp(t *testing.T) {
 		{KubernetesLocationLabel, "us-central1-a"},
 		{"__meta_kubernetes_pod_label_org", "my-org"},
 		{"__meta_kubernetes_pod_label_env", "my-env"},
+		{"__meta_kubernetes_pod_name", "my-pod"},
 	}
 	metricLabels := labels.Labels{
 		{"api_product_name", "my-name"},
@@ -149,6 +150,7 @@ func TestTranslateDevapp(t *testing.T) {
 		"org":                "my-org",
 		"env":                "my-env",
 		"api_product_name":   "my-name",
+		"host":               "my-pod",
 	}
 	expectedFinalLabels := labels.Labels{
 		{"extra_label", "my-label"},
@@ -172,6 +174,7 @@ func TestTranslateProxy(t *testing.T) {
 		{KubernetesLocationLabel, "us-central1-a"},
 		{"__meta_kubernetes_pod_label_org", "my-org"},
 		{"__meta_kubernetes_pod_label_env", "my-env"},
+		{"__meta_kubernetes_pod_name", "my-pod"},
 	}
 	metricLabels := labels.Labels{
 		{"proxy_name", "my-name"},
@@ -185,6 +188,7 @@ func TestTranslateProxy(t *testing.T) {
 		"env":                "my-env",
 		"proxy_name":         "my-name",
 		"revision":           "my-revision",
+		"host":               "my-pod",
 	}
 	expectedFinalLabels := labels.Labels{
 		{"extra_label", "my-label"},