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Increase CPU limits for node-exporter

We get frequent CPUThrottlingHigh alerts like this for the node-exporter pod on oas.gh:

Labels
alertname = CPUThrottlingHigh
container = node-exporter
namespace = oas
pod = kube-prometheus-stack-prometheus-node-exporter-72qz8
prometheus = oas/kube-prometheus-stack-prometheus
severity = info
Annotations
description = 32.58% throttling of CPU in namespace oas for container node-exporter in pod kube-prometheus-stack-prometheus-node-exporter-72qz8.
runbook_url = https://github.com/kubernetes-monitoring/kubernetes-mixin/tree/master/runbook.md#alert-name-cputhrottlinghigh
summary = Processes experience elevated CPU throttling.
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