k8sreceiver: Initial support for OpenShift metrics (#4342)

This commit adds support for OpenShift Cluster Resource Quota metrics.

.gitignore

@@ -6,6 +6,7 @@ local/
 
 # VS Code
 .vscode
+*.code-workspace
 
 # Binaries for programs and plugins
 *.exe

extension/observer/k8sobserver/go.sum

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@@ -1329,6 +1337,7 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
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@@ -1602,6 +1611,7 @@ golang.org/x/tools v0.0.0-20200312045724-11d5b4c81c7d/go.mod h1:o4KQGtdN14AW+yjs
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go.sum

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 k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
+k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
 k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
 k8s.io/klog/v2 v2.8.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
 k8s.io/klog/v2 v2.9.0 h1:D7HV+n1V57XeZ0m6tdRkfknthUaM06VFbWldOFh8kzM=

internal/k8sconfig/config.go

@@ -20,6 +20,7 @@ import (
 	"net/http"
 	"os"
 
+	quotaclientset "github.com/openshift/client-go/quota/clientset/versioned"
 	k8s "k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
@@ -136,3 +137,23 @@ func MakeClient(apiConf APIConfig) (k8s.Interface, error) {
 
 	return client, nil
 }
+
+// MakeOpenShiftQuotaClient can take configuration if needed for other types of auth
+// and return an OpenShift quota API client
+func MakeOpenShiftQuotaClient(apiConf APIConfig) (quotaclientset.Interface, error) {
+	if err := apiConf.Validate(); err != nil {
+		return nil, err
+	}
+
+	authConf, err := createRestConfig(apiConf)
+	if err != nil {
+		return nil, err
+	}
+
+	client, err := quotaclientset.NewForConfig(authConf)
+	if err != nil {
+		return nil, err
+	}
+
+	return client, nil
+}

internal/k8sconfig/go.mod

@@ -8,5 +8,6 @@ require (
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/googleapis/gnostic v0.5.1 // indirect
 	github.com/imdario/mergo v0.3.11 // indirect
+	github.com/openshift/client-go v0.0.0-20210521082421-73d9475a9142
 	k8s.io/client-go v0.21.3
 )