kubernetes deployment fix errors

cloud_computing_helm/Chart.yaml

cloud_computing_helm/templates/grafana-service.yaml

cloud_computing_helm/templates/mongodb-exporter-service.yaml

cloud_computing_helm/templates/node-exporter-service.yaml

cloud_computing_helm/templates/prometheus-service.yaml

cloud_computing_helm/templates/server-george-deployment.yaml

cloud_computing_helm/templates/server-john-deployment.yaml

cloud_computing_helm/templates/server-paul-deployment.yaml

cloud_computing_helm/templates/server-ringo-deployment.yaml

helm_install.sh