feat: introduce StatefulSet analyser.

Signed-off-by: Aris Boutselis <aris.boutselis@senseon.io>

pkg/analyzer/statefulset.go

@@ -0,0 +1,49 @@
+package analyzer
+
+import (
+	"fmt"
+
+	"github.com/k8sgpt-ai/k8sgpt/pkg/util"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+type StatefulSetAnalyzer struct{}
+
+func (StatefulSetAnalyzer) Analyze(a Analyzer) ([]Result, error) {
+	list, err := a.Client.GetClient().AppsV1().StatefulSets(a.Namespace).List(a.Context, metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	var preAnalysis = map[string]PreAnalysis{}
+
+	for _, sts := range list.Items {
+		var failures []string
+
+		// get serviceName
+		serviceName := sts.Spec.ServiceName
+		_, err := a.Client.GetClient().CoreV1().Services(sts.Namespace).Get(a.Context, serviceName, metav1.GetOptions{})
+		if err != nil {
+			failures = append(failures, fmt.Sprintf("StatefulSet uses the service %s/%s which does not exist.", sts.Namespace, serviceName))
+		}
+		if len(failures) > 0 {
+			preAnalysis[fmt.Sprintf("%s/%s", sts.Namespace, sts.Name)] = PreAnalysis{
+				StatefulSet:    sts,
+				FailureDetails: failures,
+			}
+		}
+	}
+
+	for key, value := range preAnalysis {
+		var currentAnalysis = Result{
+			Kind:  "StatefulSet",
+			Name:  key,
+			Error: value.FailureDetails,
+		}
+
+		parent, _ := util.GetParent(a.Client, value.StatefulSet.ObjectMeta)
+		currentAnalysis.ParentObject = parent
+		a.Results = append(a.Results, currentAnalysis)
+	}
+
+	return a.Results, nil
+}