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Add persistent storage to Prometheus
Previously, our Prometheus cluster did not have any persistent storage. Follow https://github.com/coreos/prometheus-operator/blob/master/Documentation/user-guides/storage.md to configure persistent storage via a StorageClass. Configuring ~40GB will cost us ~$4 a month. Note, long term it may make sense for the `prometheus-ssd` StorageClass to just become the `ssd` StorageClass and become generic across the cluster. One small downside, is that manifests relating to Storage may not work with Minikube. Long term, I'll address this discrepancy via Helm templates, but for now, I'll need to just remember it and comment out the offending lines when using Minikube.
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|# This manifest declares the StorageClass from which our Prometheus instance|
|# claims persistent storage. Note, we may eventually want to have a generic|
|# claim for using ssds that we can use across our entire cluster.|