Nextcloud OOM killed

We get this alert from time to time:

alertname = HostOomKillDetected
container = node-exporter
endpoint = http-metrics
instance = 213.108.105.236:9100
job = node-exporter
namespace = stackspin
pod = kube-prometheus-stack-prometheus-node-exporter-xztkg
prometheus = stackspin/kube-prometheus-stack-prometheus
service = kube-prometheus-stack-prometheus-node-exporter
severity = warning
Annotations
description = OOM kill detected VALUE = 1.3333333333333333 LABELS = map[container:node-exporter endpoint:http-metrics instance:213.108.105.236:9100 job:node-exporter namespace:stackspin pod:kube-prometheus-stack-prometheus-node-exporter-xztkg service:kube-prometheus-stack-prometheus-node-exporter]
summary = Host OOM kill detected (instance 213.108.105.236:9100)

There are the alers from the last 2 weeks:

❯ nse HostOomKillDetected
thread:000000000002de64       May 19 [1/1] alertmanager@varac.net; [RESOLVED] node-exporter (node-exporter http-metrics 213.108.110.31:9100 stackspin kube-prometheus-stack-prometheus-node-exporter-s4n7p stackspin/kube-prometheus-stack-prometheus kube-prometheus-stack-prometheus-node-exporter warning) (new)
thread:000000000002de63       May 19 [1/1] alertmanager@varac.net; [FIRING:1] node-exporter (node-exporter http-metrics 213.108.110.31:9100 stackspin kube-prometheus-stack-prometheus-node-exporter-s4n7p stackspin/kube-prometheus-stack-prometheus kube-prometheus-stack-prometheus-node-exporter warning) (new)
thread:000000000002de5f       May 19 [1/1] alertmanager@varac.net; [FIRING:2] node-exporter (node-exporter http-metrics 213.108.110.31:9100 stackspin kube-prometheus-stack-prometheus-node-exporter-s4n7p stackspin/kube-prometheus-stack-prometheus kube-prometheus-stack-prometheus-node-exporter warning) (new)
thread:000000000002de5a       May 19 [1/1] alertmanager@varac.net; [FIRING:1] node-exporter (node-exporter http-metrics 213.108.110.31:9100 stackspin kube-prometheus-stack-prometheus-node-exporter-s4n7p stackspin/kube-prometheus-stack-prometheus kube-prometheus-stack-prometheus-node-exporter warning) (new)
thread:000000000002de53       May 19 [1/1] alertmanager@varac.net; [FIRING:2] node-exporter (node-exporter http-metrics 213.108.110.31:9100 stackspin kube-prometheus-stack-prometheus-node-exporter-s4n7p stackspin/kube-prometheus-stack-prometheus kube-prometheus-stack-prometheus-node-exporter warning) (new)
thread:000000000002d871       May 12 [1/1] info@stackspin.net; [RESOLVED] node-exporter (HostOomKillDetected node-exporter http-metrics 213.108.108.57:9100 stackspin kube-prometheus-stack-prometheus-node-exporter-jd2gg stackspin/kube-prometheus-stack-prometheus kube-prometheus-stack-prometheus-node-exporter warning) (new)
thread:000000000002d86a       May 12 [1/1] info@stackspin.net; [FIRING:1] node-exporter (HostOomKillDetected node-exporter http-metrics 213.108.108.57:9100 stackspin kube-prometheus-stack-prometheus-node-exporter-jd2gg stackspin/kube-prometheus-stack-prometheus kube-prometheus-stack-prometheus-node-exporter warning) (new)