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    • Damien Grisonnet's avatar
      jsonnet: make prometheus-adapter highly-available · 4c6a06cf
      Damien Grisonnet authored
      
      Prometheus-adapter is a component of the monitoring stack that in most
      cases require to be highly available. For instance, we most likely
      always want the autoscaling pipeline to be available and we also want to
      avoid having no available backends serving the metrics API apiservices
      has it would result in both the AggregatedAPIDown alert firing and the
      kubectl top command not working anymore.
      
      In order to make the adapter highly-avaible, we need to increase its
      replica count to 2 and come up with a rolling update strategy and a
      pod anti-affinity rule based on the kubernetes hostname to prevent the
      adapters to be scheduled on the same node. The default rolling update
      strategy for deployments isn't enough as the default maxUnavaible value
      is 25% and is rounded down to 0. This means that during rolling-updates
      scheduling will fail if there isn't more nodes than the number of
      replicas. As for the maxSurge, the default should be fine as it is
      rounded up to 1, but for clarity it might be better to just set it to 1.
      For the pod anti-affinity constraints, it would be best if it was hard,
      but having it soft should be good enough and fit most use-cases.
      
      Signed-off-by: default avatarDamien Grisonnet <dgrisonn@redhat.com>
      4c6a06cf
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