title: kube-prometheus rule KubeControllerManagerDown is firing
body: <p>Manually installed kube-prometheus using <a href="https://github.com/prometheus-operator/kube-prometheus/tree/main/manifests" rel="noreferrer">https://github.com/prometheus-operator/kube-prometheus/tree/main/manifests</a> without using jb.</p>
  <p>Rule is firing:</p>
  <pre><code>name: KubeControllerManagerDown
  expr: absent(up{job=&quot;kube-controller-manager&quot;} == 1)
  </code></pre>
  <p>even if I create these services:
  <a href="https://github.com/prometheus-operator/prometheus-operator/issues/1859#issuecomment-437740104" rel="noreferrer">https://github.com/prometheus-operator/prometheus-operator/issues/1859#issuecomment-437740104</a></p>
  <p>How to debug this issue?</p>