How to monitor Java application data in prometheus deployed in openshift?

Question

Java

There is a variable in the program:

static final Counter exampleCounter = Counter.build()
            .name("exampleCounter")
            .help("example counter")
            .register();

Through timer.schedule() it increments once in a while.

There is get mapping, through which I checked that everything works. But I want to see a graph of changes in this data.

prometheus settings for openshift:

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    k8s-app: prometheus-example-monitor
  name: prometheus-example-monitor
  namespace: ns1
spec:
  endpoints:
  - interval: 30s
    port: web
    scheme: http
  selector:
    matchLabels:
      app: prometheus-example-app

But I can't find the data I need in the program itself. What exactly is the problem? What request should be when asking the value of the metrics?