39 lines
1.5 KiB
Markdown
39 lines
1.5 KiB
Markdown
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# observability patches
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Strategic-merge patches applied on top of Helm-managed observability
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resources. Each file is idempotent (re-applying is a no-op) and is
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reasserted by hand rather than by a controller, so re-run after any
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`helm upgrade` of the affected release.
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## `node-exporter-textfile-collector.yaml` (DEV-494)
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Enables the node-exporter textfile collector on the
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`kube-prometheus-stack-prometheus-node-exporter` DaemonSet by:
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1. adding `--collector.textfile.directory=/host/textfile_collector`
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to the container args, and
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2. mounting the host directory `/var/lib/node_exporter/textfile_collector`
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read-only at `/host/textfile_collector` (`hostPath` type
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`DirectoryOrCreate`, kubelet creates it on nodes where the
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directory does not exist yet).
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The four monitoring backup CronJobs in `apps/monitoring/` write their
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textfile-collector `.prom` files into that same host directory, so the
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metrics surface in Prometheus via node-exporter's normal scrape.
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Apply / re-apply:
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```bash
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kubectl -n observability patch daemonset \
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kube-prometheus-stack-prometheus-node-exporter \
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--type=strategic \
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--patch-file=apps/observability/patches/node-exporter-textfile-collector.yaml
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kubectl -n observability rollout status daemonset \
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kube-prometheus-stack-prometheus-node-exporter
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```
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The kube-prometheus-stack chart is not currently tracked in ArgoCD;
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if it moves under GitOps, fold these values into the chart values as
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`prometheus-node-exporter.extraArgs` + `.extraHostVolumeMounts`
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instead of maintaining this patch.
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