How can I make ChatOps HA?

To make ChatOps highly avialable scale up the deployments which listen for http requests to, say, 3 replicas.

When using Lighthouse that just means modifying the replicas for the lighthouse deployment. e.g. in your boot git repository try changing env/lighthouse/values.tmpl.yaml to:

replicaCount: 3

When using Prow you need to scale up hook and pipelinerunner . e.g. in your boot git repository try changing env/prow/values.tmpl.yaml to:

hook:
  replicaCount: 3
pipelinerunner:
  replicaCount: 3