Kubernetes yml selector select with two app name

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I am new to Kubernetes. I created a server monitor and the selector select two services:

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    app: servicemonitor-sms-services
    release: kube-prom-stack
  name: servicemonitor-sms-config-services
  namespace: metrics
spec:
  selector:
    matchLabels:
      app: a-service
      app: b-service

I want the monitor watches both a-service and b-service. The last above doesn’t work because I defined duplicated key. I am wondering how should I change it to?

Thanks!

Source: Docker Questions