How to autoscale Nats consumer applications based on prometheus metrics

[DarkPhantom-Dev]

Hi all,

I am using provided nats exporter by enabling it in the nats helm chart

promExporter:
  enabled: true
  image:
    repository: natsio/prometheus-nats-exporter
    tag: 0.15.0
    pullPolicy:
    registry:

  port: 7777
  # env var map, see nats.env for an example
  env: {}

  # merge or patch the container
  # https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.24/#container-v1-core
  merge: {}
  patch: []

  ############################################################
  # prometheus pod monitor
  ############################################################
  podMonitor:
    enabled: true

    # merge or patch the pod monitor
    # https://prometheus-operator.dev/docs/operator/api/#monitoring.coreos.com/v1.PodMonitor
    merge: {}
    patch: []
    # defaults to "{{ include "nats.fullname" $ }}"
    name:

I am also using the nats provided grafana charts to see some important metrics from interaction with nats broker.

But i am unsure how do we scale up or down the consuming applications in case of consumer lag or slow consumers? I am planning to use something like KEDA to do autoscaling of pods using grafana metrics.

Lets assume I am producing messages at the rate 500 requests per second , I am unable to see any nats dashboards which show that 500 requests per second is produce rate & what is appropriate consume rate.

Should we log our own metrics if we need this or can we rely on any custom provided metrics to keep a steady produce & consume rate?